| 1. |
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| 2. |
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| 3. |
- Bergendorff, Ola, et al.
(författare)
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Airborne contact dermatitis from formaldehyde released from heated plastic polymers.
- 1994
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Ingår i: American Journal of Contact Dermatitis. - 1532-8163. ; 5:4, s. 223-225
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Tidskriftsartikel (refereegranskat)abstract
- A 55-year-old woman developed an airborne dermatitis on her face. Patch testing was performed and showed positive reactions to formaldehyde, thiuram mix, carba mix, and nickel sulphate. She operated a machine at work in which polyacetal granules were heated. The presence of formaldehyde in the pyrolysis smoke from the polymer was confirmed by chemical analysis.
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| 4. |
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| 5. |
- Carlsson, Christer, et al.
(författare)
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Cutaneous innervation before and after one treatment period of acupuncture.
- 2006
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Ingår i: British Journal of Dermatology. - : Oxford University Press (OUP). - 1365-2133 .- 0007-0963. ; 155:5, s. 970-976
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: The effect of acupuncture on nociceptive pain is well documented, but effects on nociceptive itch have been contradictory. OBJECTIVES: To evaluate possible effects of acupuncture on the occurrence, distribution and function of sensory nerve fibres in human skin. METHODS: Ten subjects were treated by inserting 10 acupuncture needles subcutaneously at the upper lateral aspect of one buttock. The subjects were recruited from an acupuncture clinic and were undergoing specific acupuncture treatment for their disorders. The needles were stimulated (rotated to and fro) twice during the twice-weekly 25-min sessions over 5 weeks. Skin biopsies, diameter 3 mm, were taken before and 3-6 days after local acupuncture. Antibodies to the pan-neuronal marker protein gene product 9.5 (PGP 9.5), calcitonin gene-related peptide (CGRP), vanilloid receptor 1 (VR1) and mu- and delta-opioid receptors were employed to study sensory unmyelinated nerve fibres that transmit nociceptive pain and itch. A histamine prick test using planimetry was used to record experimental itch after acupuncture on the treated area and on the corresponding control skin, and a visual analogue scale was used to evaluate itch. RESULTS: The mean +/- SEM number of CGRP-immunoreactive nerve fibres per biopsy section was reduced from 36.0 +/- 3.3 to 21.3 +/- 4.0 (P = 0.05) after the treatment. PGP 9.5-immunoreactive nerve fibres were found both in the epidermis and in the subpapillary dermis. The mean +/- SEM total number of PGP 9.5-immunoreactive nerve fibres decreased from 249.8 +/- 16.7 to 211.8 +/- 12.0 (P = 0.03). The PGP 9.5-immunoreactive nerve fibres occurring in the dermis appeared more fragmented after the acupuncture compared with pretreatment. VR1 immunoreactivity was found both in the free nerve fibres and in kite-like formations, possibly mast cells, throughout the dermis, sometimes occurring around hair follicles. The mean +/- SEM number of VR1-immunoreactive elements was not significantly influenced by acupuncture, at 33.5 +/- 4.6 vs. 43.0 +/- 4.4 (P = 0.09). No immunoreactivity was found in the skin against mu- and delta-opioid receptors with the antibodies used in this study. Neither histamine-induced itch nor cutaneous responses were influenced by acupuncture. CONCLUSIONS: The present data indicate an effect of acupuncture on neuropathic itch but not histamine-mediated itch. Our findings support the opinion that the pain-relieving effects of acupuncture partly depend on its effect on the peripheral innervation.
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| 6. |
- Carlsson, C P, et al.
(författare)
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Therapeutic and experimental therapeutic studies on acupuncture and itch: review of the literature.
- 2010
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Ingår i: Journal of the European Academy of Dermatology and Venereology. - : Wiley. - 1468-3083 .- 0926-9959. ; 24, s. 1013-1016
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Tidskriftsartikel (refereegranskat)abstract
- Abstract Itch accompanies most inflammatory skin diseases but may occur as a solitary sensation in otherwise normal skin. Chronic itch often requires combined treatments but some cases remain therapy resistant. Complementary medicine is becoming increasingly popular among patients. Acupuncture is the oldest and most well-studied alternative option with evidence-based effect on pain. This article summarizes the rational for the use of acupuncture in treatment of itch and reviews therapeutic and experimental therapeutic studies on acupuncture and itch.
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| 7. |
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| 8. |
- Ferm, Ingela, et al.
(författare)
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Somatic and psychiatric comorbidity in patients with chronic pruritus.
- 2010
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Ingår i: Acta Dermato-Venereologica. - : Medical Journals Sweden AB. - 1651-2057 .- 0001-5555. ; 90:4, s. 395-400
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Tidskriftsartikel (refereegranskat)abstract
- It has been reported that 10-50% of patients with pruritus but no skin rash have an underlying systemic disease and up to 70% a psychiatric one. The aim of this retrospective study was to review the records of a large number of patients with chronic pruritus for concomitant diseases and treatment options. Medical records of 139 patients (52 males, 87 females) with chronic pruritus who visited the outpatient dermatological clinic during a 17-month period were reviewed. Itch was the presenting symptom in 6 of 47 patients with systemic disease and in 17 of 31 patients with psychiatric disease. Twenty-four patients had neuropathic itch and 37 patients had pruritus of unknown origin. The most severe and long-lasting itch was found in patients with multiple systemic diseases and in those with pruritus of unknown origin. Pruritus of the scalp and face was most common in psychogenic pruritus. Phototherapy was found to be a useful therapeutic option. In conclusion, systemic diseases are unlikely to cause chronic pruritus in patients consulting a dermatology department.
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| 9. |
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| 10. |
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| 11. |
- Ley, Hong Liang, et al.
(författare)
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Psychosomatic factors in pruritus
- 2013
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Ingår i: Clinics in Dermatology. - : Elsevier BV. - 0738-081X. ; 31:1, s. 31-40
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Tidskriftsartikel (refereegranskat)abstract
- Pruritus and psyche are intricately and reciprocally related, with psychophysiological evidence and psychopathological explanations helping us to understand their complex association. Their interaction may be conceptualized and classified into 3 groups: pruritic diseases with psychiatric sequelae, pruritic diseases aggravated by psychosocial factors, and psychiatric disorders causing pruritus. Management of chronic pruritus is directed at treating the underlying causes and adopting a multidisciplinary approach to address the dermatologic, somatosensory, cognitive, and emotional aspects. Pharmcotherapeutic agents that are useful for chronic pruritus with comorbid depression and/or anxiety comprise selective serotonin reuptake inhibitors, mirtazapine, tricyclic antidepressants (amitriptyline and doxepin), and anticonvulsants (gabapentin, pregabalin); the role of neurokinin receptor-1 antagonists awaits verification. Antipsychotics are required for treating itch and formication associated with schizophrenia and delusion of parasitosis (including Morgellons disease). (c) 2013 Elsevier Inc. All rights reserved.
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| 12. |
- Lindmark, Bertil, et al.
(författare)
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Heterozygous, a1-antitrypsin deficiency may be associated with cold urticaria.
- 1992
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Ingår i: Allergy. - : Wiley. - 1398-9995 .- 0105-4538. ; 47:5, s. 456-458
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Tidskriftsartikel (refereegranskat)abstract
- Proteins of the serpin family (serine protease inhibitor) control key steps in the inflammatory, coagulation and complement systems. C1‐inhibitor deficiency predisposes to hereditary angioneurotic oedema, and other serpins control proteolytic enzymes that may cause complement activation or the forming of oedema. We investigated whether deficiency of proteins of the serpin family may predispose to cold urticaria and therefore screened 7 male patients with severe cold urticaria for the presence of deficieney alleles of some of the members of the serpin antiprotease family. There were no findings of C1‐inhibitor, α1‐antitrypsin, α2‐antiplasmin, antithrombin III, tissue plasminogen activator inhibitor or thyroxine binding protein deficiency. The prevalence of heterozygous α1‐antichymotrypsin deficieney was significantly higher than expected (prevalence ratio 25.8 (95% confidence interval 6.0‐112), p< 0.0001). This finding is in concert with previous studies that have shown lower mean levels of α1‐antichymotrypsin among patients with cold urticaria and suggests that heterozygous deficiency of this antiprotease, which controls neutrophil eathepsin G and mast cell chymase may predispose to cold urticaria. The present series is, however, small and the results need confirmation in larger materials.
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| 13. |
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| 14. |
- Misery, Laurent, et al.
(författare)
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Definition of sensitive skin : An expert position paper from the special interest group on sensitive skin of the international forum for the study of itch
- 2017
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Ingår i: Acta Dermato-Venereologica. - : Medical Journals Sweden AB. - 0001-5555. ; 97:1, s. 4-6
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Tidskriftsartikel (refereegranskat)abstract
- Sensitive skin is a frequent complaint in the general population, in patients, and among subjects suffering from itch. The International Forum for the Study of Itch (IFSI) decided to initiate a special interest group (SIG) on sensitive skin. Using the Delphi method, sensitive skin was defined as “A syndrome defined by the occurrence of unpleasant sensations (stinging, burning, pain, pruritus, and tingling sensations) in response to stimuli that normally should not provoke such sensations. These unpleasant sensations cannot be explained by lesions attributable to any skin disease. The skin can appear normal or be accompanied by erythema. Sensitive skin can affect all body locations, especially the face”. This paper summarizes the background, unresolved aspects of sensitive skin and the process of developing this definition.
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| 15. |
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| 16. |
- Pereira, Manuel P, et al.
(författare)
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Chronic Nodular Prurigo : A European Cross-sectional Study of Patient Perspectives on Therapeutic Goals and Satisfaction
- 2021
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Ingår i: Acta Dermato-Venereologica. - : Medical Journals Sweden AB. - 1651-2057. ; 101
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Tidskriftsartikel (refereegranskat)abstract
- Chronic nodular prurigo is characterized by recalcitrant itch. Patient perspectives on therapeutic goals, satisfaction with therapy and efficacy of therapeutic regimens for this condition are unknown. This questionnaire study examined these issues in 406 patients with chronic nodular prurigo from 15 European dermatological centres. Improvements in itch, skin lesions and sleep were the most important goals. Emollients, topical corticosteroids and antihistamines were the most frequently used treatments, while a minority of patients were prescribed potent medications, such as systemic immunosuppressants and gabapentinoids. Most patients were not satisfied with their previous therapy (56.8%), while 9.8% did not receive any therapy despite having active disease. A substantial number of respondents (28.7%) considered none of the therapeutic options effective. Although chronic nodular prurigo is a severe disease, most patients were not treated with potent systemic drugs, which may contribute to the high levels of dissatisfaction and disbelief in available therapies. Specific guidelines for chronic nodular prurigo and the development of novel therapies are necessary to improve care.
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| 17. |
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| 18. |
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| 19. |
- Siddhuraj, Premkumar, et al.
(författare)
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Lung Mast Cells Have a High Constitutive Expression of Carboxypeptidase A3 mRNA That Is Independent from Granule-Stored CPA3
- 2021
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Ingår i: Cells. - : MDPI AG. - 2073-4409. ; 10:2
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Tidskriftsartikel (refereegranskat)abstract
- The mast cell granule metalloprotease CPA3 is proposed to have important tissue homeostatic functions. However, the basal CPA3 mRNA and protein expression among mast cell populations has remained poorly investigated. Using a novel histology-based methodology that yields quantitative data on mRNA and protein expression at a single-cell level, the present study maps CPA3 mRNA and protein throughout the MCT and MCTC populations in healthy skin, gut and lung tissues. MCTC cells had both a higher frequency of CPA3 protein-containing cells and a higher protein-staining intensity than the MCT population. Among the tissues, skin MCs had highest CPA3 protein intensity. The expression pattern at the mRNA level was reversed. Lung mast cells had the highest mean CPA3 mRNA staining. Intriguingly, the large alveolar MCT population, that lack CPA3 protein, had uniquely high CPA3 mRNA intensity. A broader multi-tissue RNA analysis confirmed the uniquely high CPA3 mRNA quantities in the lung and corroborated the dissociation between chymase and CPA3 at the mRNA level. Taken together, our novel data suggest a hitherto underestimated contribution of mucosal-like MCT to baseline CPA3 mRNA production. The functional consequence of this high constitutive expression now reveals an important area for further research.
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| 20. |
- Staender, Sonja, et al.
(författare)
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Clinical classification of itch: a position paper of the international forum for the study of itch
- 2007
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Ingår i: Acta Dermato-Venereologica. - : Medical Journals Sweden AB. - 1651-2057 .- 0001-5555. ; 87:4, s. 291-294
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Tidskriftsartikel (refereegranskat)abstract
- Chronic itch is a common and distressing symptom that arises from a variety of skin conditions and systemic diseases. Despite this, there is no clinically based classification of pruritic diseases to assist in the diagnosis and cost-effective medical care of patients with pruritus. The proposed classification focuses on clinical signs and distinguishes between diseases with and without primary or secondary skin lesions. Three groups of conditions are proposed: pruritus on diseased (inflamed) skin (group I), pruritus on non-diseased (non-inflamed) skin (group II), and pruritus presenting with severe chronic secondary scratch lesions, such as prurigo nodularis (group III). The next part classifies the underlying diseases according to different categories: dermatological diseases, systemic diseases including diseases of pregnancy and drug-induced pruritus, neurological and psychiatric diseases. In some patients more than one cause may account for pruritus (category "mixed") while in others no underlying disease can be identified (category "others"). This is the first version of a clinical classification worked out by the members of the International Forum for the Study of Itch. It is intended to serve as a diagnostic route for better evaluation of patients with chronic pruritus and aims to improve patients' care.
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| 21. |
- Ständer, S, et al.
(författare)
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European EADV network on assessment of severity and burden of Pruritus (PruNet): first meeting on outcome tools.
- 2015
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Ingår i: Journal of the European Academy of Dermatology and Venereology. - : Wiley. - 1468-3083 .- 0926-9959. ; 30:7, s. 1144-1147
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Tidskriftsartikel (refereegranskat)abstract
- Chronic pruritus is a frequently occurring symptom of various dermatoses that causes a high burden and impaired quality of life. An effective anti pruritic therapy is important for the patient, but its effectiveness is difficult to evaluate. Diverse methods and interpretations of pruritic metrics are utilized in clinical trials and the daily clinical practice in different countries, resulting in difficulties comparing collected data.
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| 22. |
- Ständer, Sonja, et al.
(författare)
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IFSI-Guideline on Chronic Prurigo including Prurigo nodularis.
- 2020
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Ingår i: ITCH. - : Ovid Technologies (Wolters Kluwer Health). - 2380-5048. ; 5:4, s. 1-13
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Forskningsöversikt (refereegranskat)abstract
- Chronic prurigo (CPG) is a highly burdensome pruritic disease characterized by chronic itch, a prolonged scratching behavior and the development of localized or generalized hyperkeratotic pruriginous lesions. Neuronal sensitization and the development of an itch-scratch cycle contribute to the augmentation of pruritus and the chronicity of the disease. We provide here the first international guideline for a rational diagnostic and therapeutic approach for CPG. Recommendations are based on available evidence and expert opinion. The diagnosis of CPG is made clinically. A detailed medical history together with laboratory and radiological examinations are advised in order to determine the severity of CPG, identify the underlying origin of the itch and assist in the elaboration of a treatment plan. Therapeutically, it is advised to adopt a multimodal approach, including general strategies to control itch, treatment of the underlying pruritic conditions, and of the pruriginous lesions. Topical (corticosteroids, calcineurin inhibitors, capsaicin) and systemic antipruritic agents (eg, gabapentinoids, immunosuppressants, and opioid modulators) as well as physical treatment modalities (phototherapy, cryotherapy) should be employed in a step-wise approach. Psychosomatic or psychological interventions may be recommended in CPG patients with signs of psychiatric/psychological comorbidities.
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| 23. |
- Wallengren, Joanna
(författare)
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An update on chronic prurigo.
- 2011
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Ingår i: Current Medical Litterature: Dermatology. ; 16:4, s. 89-95
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Bokkapitel (refereegranskat)
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| 24. |
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| 25. |
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| 26. |
- Wallengren, Joanna, et al.
(författare)
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Botulinum Toxin Type A for neuropathic itch.
- 2010
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Ingår i: British Journal of Dermatology. - : Oxford University Press (OUP). - 1365-2133 .- 0007-0963. ; 163, s. 424-426
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Tidskriftsartikel (refereegranskat)
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| 27. |
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| 28. |
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| 29. |
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| 30. |
- Wallengren, Joanna, et al.
(författare)
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Brachioradial pruritus is associated with a reduction in cutaneous innervation that normalizes during the symptom-free remissions.
- 2005
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Ingår i: Journal of American Academy of Dermatology. - : Elsevier BV. - 0190-9622. ; 52:1, s. 142-145
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Tidskriftsartikel (refereegranskat)abstract
- Background: There has been a controversy regarding the cause of brachioradial pruritus: is it caused by a nerve compression in the cervical spine or is it caused by a prolonged exposure to sunlight? Objective: The purpose was to study clinical features of patients with brachioradial pruritus and to compare the cutaneous innervation in punch biopsies from the itchy skin of patients with the age-matched controls. Methods: Skin biopsy specimens from itchy skin of 16 patients with brachioradial pruritus were collected during the early autumn and were compared with corresponding skin specimens from 11 age-matched controls in the early spring, four of the patients being their own controls. The cutaneous innervation was visualized by antibodies against protein gene product 9.5 (general neuronal marker), by antibodies against calcitonin gene-related peptide (marker for thin sensory nerve fibers), and by antibodies against VR1-receptor (marker for capsaicin-sensitive nerve fibers). Results: In all but two of the patients, itching of the arms or shoulders was seasonal. Some patients reported neck pain. in the skin of the lower arm, the number of protein gene product 9.5 immunoreactive nerve fibers was reduced 23% as compared with controls (P = .03), the number of intraepithelial nerve fibers being reduced by 27% (P = .03). The number of calcitonin gene-related peptide immunoreactive nerve fibers in the dermis was reduced by 34% (P = .02) and the number of capsaicin-sensitive nerve fibers by 43% (P = .008). The innervation of the four patients who were their own controls became normalized during the symptom-free period. Conclusions: The temporal course of the brachioradial pruritus and the histological changes in the skin similar to those caused by ultraviolet light, indicate that sunlight is an eliciting factor and that cervical spine disease can be a predisposing factor.
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| 31. |
- Wallengren, Joanna, et al.
(författare)
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Capsaicin enhances allergic contact dermatitis in guinea pig.
- 1991
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Ingår i: Contact Dermatitis. - : Wiley. - 0105-1873. ; 24:1, s. 30-34
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Tidskriftsartikel (refereegranskat)abstract
- Guinea pigs were sensitized to dinitrochlorobenzene (DNCB) by the intracutaneous route and challenged epicutaneously tin the flanks. The intensity of the allergic contact dermatitis was evaluated by inspection and palpation as well us by wet weight determination. With the purpose of diminishing tissue neuropeptides, and substance P in particular, the animals were treated with capsaicin either between induction and challenge, or before sensitization, In comparison with controls, the contact dermatitis was Enhanced in both groups of animals treated with capsaicin.
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| 32. |
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| 33. |
- Wallengren, Joanna
(författare)
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Chronic prurigo: etiology and therapy
- 2006
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Ingår i: Current Medical Literature: Dermatology. - 1361-4215. ; 11:2, s. 29-34
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Tidskriftsartikel (refereegranskat)
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| 34. |
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| 35. |
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| 36. |
- Wallengren, Joanna, et al.
(författare)
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Cutaneous field stimulation in the treatment of severe itch
- 2001
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Ingår i: Archives of Dermatology. - 0003-987X. ; 137:10, s. 1323-1325
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE: To evaluate the efficacy of cutaneous field stimulation of C fibers for the treatment of itchy skin and its effect on peripheral nerve fibers as shown in skin biopsy specimens. DESIGN: We conducted an open-label uncontrolled study of 19 patients with itching. Each patient applied a flexible plate containing electrodes to the itchy area for 20 minutes at a time once daily for 5 weeks to stimulate nerve fibers with a constant current (0.8 mA). Skin biopsy specimens were collected before treatment and at the end of treatment and were immunostained for calcitonin gene-related peptide and protein gene product 9.5. SETTING: University hospital in Lund, Sweden. PATIENTS: Sixteen patients with nostalgia paresthetica or brachioradial pruritus and 3 with generalized itch. INTERVENTIONS: Cutaneous field stimulation and punch biopsies of the itchy skin. MAIN OUTCOME MEASURES: Visual analog scale for assessment of itching and counting the immunoreactive nerve fibers in 3-mm biopsy specimens. RESULTS: Patients with localized itching experienced a reduction in mean values on the visual analog scale (from 78% before treatment to 42% by the end of the fifth week). The number of protein gene product 9.5- immunoreactive nerve fibers in the epidermis was reduced by 40% by the end of treatment compared with baseline values. CONCLUSIONS: Cutaneous field stimulation is an effective alternative for the treatment of localized itching. The reduction in itching is accompanied by degeneration of the epidermal nerve fibers, as evidenced by the loss of protein gene product 9.5 immunoreactivity.
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| 37. |
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| 38. |
- Wallengren, Joanna
(författare)
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Cutaneous field stimulation of sensory nerve fibers reduces itch without affecting contact dermatitis.
- 2002
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Ingår i: Allergy. - : Wiley. - 1398-9995 .- 0105-4538. ; 57:12, s. 1195-1199
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Tidskriftsartikel (refereegranskat)abstract
- Background: A new technique, cutaneous field stimulation (CFS), which activates electrically unmyelinated C-fibers, is used to treat localized itch. Its action is similar to that of capsaicin, the pungent agent in hot peppers, which enhances delayed allergic reactions. The aim of the study was to investigate how experimental contact dermatitis responds to CFS. Methods: Twelve patients with contact dermatitis in response to nickel were treated by CFS for 1 h each for four consecutive days. A flexible plate containing electrodes was applied to a test area on the upper arm and was stimulated by a constant current (0.8 mA). On the fifth day, patients were provoked by epicutaneous application of nickel sulfate (allergic contact dermatitis) and benzalkonium chloride (irritant contact dermatitis), and by intradermal tuberculin (delayed immunologic reaction). Twelve other patients with IgE-mediated allergy were treated by CFS on the lower arm for 1 h and were then pricked with histamine and allergen extracts (wheal volume was measured) and were tested using benzoic acid (nonimmunologic contact urticaria; closed test). Ten of these patients were also treated by CFS for four days, and experiments were performed on the fifth day. Results: Test reactions to nickel, benzalkonium, and tuberculin were found to be unaffected by CFS treatment. Although allergic prick test reactions were enhanced (by 28%) after a single CFS treatment, the associated itch was significantly reduced both after single and repeated CFS treatments (by 65% and 38%, respectively). Conclusions: Repeated use of CFS to reduce itch has no adverse effects on contact dermatitis.
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| 39. |
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| 40. |
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| 41. |
- Wallengren, Joanna, et al.
(författare)
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Cutaneous sensory nerve fibers are decreased in number after peripheral and central nerve damage.
- 2002
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Ingår i: Journal of American Academy of Dermatology. - : Elsevier BV. - 0190-9622. ; 46:2, s. 215-217
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Tidskriftsartikel (refereegranskat)abstract
- Two dermatologic patients displaying peripheral and central nerve damage, respectively, are described. Cutaneous nerve fibers in both patients were studied in skin biopsy specimens taken from neuropathic areas and from the contralateral side, immunocytochemistry being applied to a pan-neuronal marker, a protein gene-product (PGP 9.5). One of the patients, suffering from compression of the ulnar nerve, had dyshidrotic eczema of the hands that was absent on areas of skin that were neuropathic. The cutaneous innervation (most of which was sensory) was reduced by 50% in the neuropathic area as compared with the contralateral side. The other patient had unilateral pruritus on the parethic side after a stroke. The cutaneous innervation of that side was reduced by 80% as compared with the other side. It seems that peripheral sensory innervation is a prerequisite for inflammation, whereas spontaneous itching may emanate from a central nervous system disorder such as a stroke and continue on in partly denervated skin.
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| 42. |
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| 43. |
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| 44. |
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| 45. |
- Wallengren, Joanna, et al.
(författare)
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Effects of capsaicin, bradykinin and prostaglandin E2 in the human skin
- 1992
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Ingår i: British Journal of Dermatology. - : Oxford University Press (OUP). - 1365-2133 .- 0007-0963. ; 126:2, s. 111-117
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Tidskriftsartikel (refereegranskat)abstract
- The actions and interactions of putative mediators of inflammation, such as substance P (SP), histamine, bradykinin and prostaglandins (PGE2) were studied in human skin. In addition, the effects of capsaicin were examined as it is known to release (and to deplete) SP and calcitonin gene-related peptide from C-fibres. The flare evoked by bradykinin was abolished by pretreatment with lignocaine (local anesthetic), compound 48/80 (mast-cell histamine liberator), mepyramine (H1-receptor antagonist) and indomethacin (cyclo-oxygenase inhibitor) but was unaffected by atropine and ketanserin (serotonin antagonist). The weal response was not reduced by any of the drugs. The flare evoked by capsaicin was abolished by lignocaine and indomethacin but was unaffected by compound 48/80, mepyramine, atropine and ketanserin. The weal response was reduced by indomethacin. The flare response to bradykinin seems to reflect the activation of C-fibres and associated mast cells, while the flare response to capsaicin seems to reflect the activation of C-fibres only. Repeated injections of capsaicin and bradykinin produced tachyphylaxis (and cross-tachyphylaxis) and greatly reduced the SP-evoked flare. Capsaicin produced tachyphylaxis also after treatment of the skin with a local anaesthetic, suggesting that it develops independently of C-fibre impulse flow. The tachyphylaxis produced by bradykinin and capsaicin seems to reflect the depletion of messenger peptides from the C-fibres. The flare response to SP following capsaicin- or bradykinin-induced desensitization gradually returned to normal after 5-8 weeks. The erythema evoked by PGE2 was reduced by 30% following pretreatment with lignocaine, mepyramine or compound 48/80.
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| 46. |
- Wallengren, Joanna, et al.
(författare)
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Effects of substance P, neurokinin A and calcitonin gene-related peptide in human skin and their involvement in sensory mediated responses.
- 1987
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Ingår i: European Journal of Pharmacology. - : Elsevier BV. - 1879-0712 .- 0014-2999. ; 143:2, s. 267-273
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Tidskriftsartikel (refereegranskat)abstract
- The effects evoked by intradermal injections of substance P (SP), neurokinin A (NKA) or calcitonin gene-related peptide (CGRP) were studied in 51 non-atopic subjects. SP and NKA produced flare and weal, and CGRP produced an indurated erythema. The reactions to SP were strong, the flare being maximal 3–5 min after injection and the weal after 10–15 min. NKA evoked a much weaker flare and a slightly weaker weal than did SP. CGRP produced a prominent long-lasting, indurated erythema with pseudopodia surrounded by a pallor edge. The mode of action of the three peptides was studied by pretreatment of the skin with the histamine-releasing compound 48/80, the H1-antagonist mepyramine or the local anesthetic xylocaine. The results suggest that mast-cell histamine and an intact sensory nerve supply are essential for the flare response to both SP and NKA. The weal response to SP was somewhat reduced by pretreatment with either 48/80 or xylocaine. The weal response to NKA, however, did not seem to depend upon either mast cells or sensory nerve fibres. The erythema evoked by CGRP was not suppressed by pretreatment with xylocaine, compound 48/80 or mepyramine, suggesting a direct action of CGRP on the blood vessels. The interaction between SP and CGRP was studied in subjects receiving a low dose of CGRP and increasing doses of SP or a low dose of SP and increasing doses of CGRP. CGRP did not potentiate the SP-evoked flare and weal and SP did not seem to enhance the response to CGRP.
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| 47. |
- Wallengren, Joanna, et al.
(författare)
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Familial brachioradial pruritus
- 2005
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Ingår i: British Journal of Dermatology. - : Oxford University Press (OUP). - 1365-2133 .- 0007-0963. ; 153:5, s. 1016-1018
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Tidskriftsartikel (refereegranskat)
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| 48. |
- Wallengren, Joanna
(författare)
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Flushreaktioner
- 2002
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Konferensbidrag (refereegranskat)
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| 49. |
- Wallengren, Joanna
(författare)
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How I investigate itchy patients who have no rash.
- 2003
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Ingår i: Journal of the European Academy of Dermatology and Venereology. - : Wiley. - 1468-3083 .- 0926-9959. ; 17:Suppl 3, s. 42-42
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Konferensbidrag (refereegranskat)
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| 50. |
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