| 1. |
- Wan Saudi, Wan Salman, et al.
(författare)
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Neuropeptide S inhibits gastrointestinal motility and increases mucosal permeability through nitric oxide
- 2015
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Ingår i: American Journal of Physiology - Gastrointestinal and Liver Physiology. - : American Physiological Society. - 0193-1857 .- 1522-1547. ; 309:8, s. G625-G634
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Tidskriftsartikel (refereegranskat)abstract
- Neuropeptide S (NPS) receptor (NPSR1) polymorphisms are associated with enteral dysmotility and inflammatory bowel disease (IBD). This study investigated the role of NPS in conjunction with nitrergic mechanisms in the regulation of intestinal motility and mucosal permeability. In rats, small intestinal myoelectric activity and luminal pressure changes in small intestine and colon, along with duodenal permeability were studied. In human intestine, NPS and NPSR1 were localized by immunostaining. Pre- and postprandial plasma NPS was measured by ELISA in healthy and active IBD humans. Effects and mechanisms of NPS were studied in human intestinal muscle strips. In rats, NPS 100-4000 pmol/kg·min had effects on the small intestine and colon. Low doses of NPS increased myoelectric spiking (p<0.05). Higher doses reduced spiking and prolonged the cycle length of the migrating myoelectric complex, reduced intraluminal pressures (p<0.05-0.01) and increased permeability (p<0.01) through NO-dependent mechanisms. In human intestine, NPS localized at myenteric nerve cell bodies and fibers. NPSR1 was confined to nerve cell bodies. Circulating NPS in humans was tenfold below the ~0.3 nmol/l dissociation constant (Kd) of NPSR1, with no difference between healthy and IBD subjects. In human intestinal muscle strips pre-contracted by bethanechol, NPS 1-1000 nmol/l induced NO-dependent muscle relaxation (p<0.05) that was sensitive also to tetrodotoxin (p<0.01). In conclusion, NPS inhibits motility and increases permeability in neurocrine fashion acting through NO in the myenteric plexus in rats and humans. Aberrant signaling and up-regulation of NPSR1 could potentially exacerbate dysmotility and hyperpermeability by local mechanisms in gastrointestinal functional and inflammatory reactions.
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| 2. |
- Halim, M. Abdul, et al.
(författare)
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Nitric oxide regulation of migrating motor complex : randomized trial of N-G-monomethyl-L-arginine effects in relation to muscarinic and serotonergic receptor blockade
- 2015
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Ingår i: Acta Physiologica. - : Wiley. - 1748-1708 .- 1748-1716. ; 215:2, s. 105-118
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Tidskriftsartikel (refereegranskat)abstract
- Aim: The migrating motor complex (MMC) propels contents through the gastrointestinal tract during fasting. Nitric oxide (NO) is an inhibitory neurotransmitter in the gastrointestinal tract. Little is known about how NO regulates the MMC. In this study, the aim was to examine nitrergic inhibition of the MMC in man using N-G-monomethyl-L-arginine (L-NMMA) in combination with muscarinic receptor antagonist atropine and 5-HT3 receptor antagonist ondansetron. Methods: Twenty-six healthy volunteers underwent antroduodenojejunal manometry for 8 h with saline or NO synthase (NOS) inhibitor L-NMMA randomly injected I.V. at 4 h with or without atropine or ondansetron. Plasma ghrelin, motilin and somatostatin were measured by ELISA. Intestinal muscle strip contractions were investigated for NO-dependent mechanisms using L-NMMA and tetrodotoxin. NOS expression was localized by immunohistochemistry. Results: L-NMMA elicited premature duodenojejunal phase III in all subjects but one, irrespective of atropine or ondansetron. L-NMMA shortened MMC cycle length, suppressed phase I and shifted motility towards phase II. Pre-treatment with atropine extended phase II, while ondansetron had no effect. L-NMMA did not change circulating ghrelin, motilin or somatostatin. Intestinal contractions were stimulated by L-NMMA, insensitive to tetrodotoxin. NOS immunoreactivity was detected in the myenteric plexus but not in smooth muscle cells. Conclusion: Nitric oxide suppresses phase III of MMC independent of muscarinic and 5-HT3 receptors as shown by nitrergic blockade, and acts through a neurocrine disinhibition step resulting in stimulated phase III of MMC independent of cholinergic or 5-HT3-ergic mechanisms. Furthermore, phase II of MMC is governed by inhibitory nitrergic and excitatory cholinergic, but not 5-HT3-ergic mechanisms.
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| 3. |
- Resendez, Angel, et al.
(författare)
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Rapid small intestinal permeability assay based on riboflavin and lactulose detected by bis-boronic acid appended benzyl viologens
- 2015
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Ingår i: Clinica Chimica Acta. - : Elsevier BV. - 0009-8981 .- 1873-3492. ; 439, s. 115-121
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Although organoboronic acids are efficient high-throughput sugar sensors, they have not been pursued for gut permeability studies. A modification of the lactulose/mannitol assay is described by which small intestinal permeability is assessed at the time of urine collection using a lactulose/riboflavin ratio.METHODS: Volunteers ingested 50mg riboflavin and either 5g mannitol or 10g lactulose. Urine was collected for 6hrs. Riboflavin was assayed by autofluorescence. Riboflavin was removed by C18 solid phase extraction. Lactulose and mannitol were then assayed using 1,1'-bis(2-boronobenzyl)-4,4'-bipyridinium (4,4'oBBV) coupled to the fluorophore HPTS.RESULTS: The temporal profile over 6hrs for riboflavin paralleled mannitol. Riboflavin recovery in urine was 11.1±1.9 % (mean±SEM, n=7), similar to mannitol. There was selective binding of 4,4'oBBV to lactulose, likely involving cooperativity between the fructose and galactose moieties. Lower limits of detection and quantification were 90 and 364μM. The lactulose assay was insensitive to other permeability probes (e.g., sucrose, sucralose) while tolerating glucose or lactose. This assay can be adapted to automated systems. Stability of 4,4'oBBV exceeds 4years.CONCLUSIONS: Riboflavin measured by autofluorescence combined with lactulose measured with 4,4'oBBV represents a useful new chemistry for rapid measurement of intestinal permeability with excellent stability, cost and throughput benefits.
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| 4. |
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| 5. |
- Abdullah, Abu Sayeed Md., et al.
(författare)
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Effects of climate change and maternal morality : Perspective from case studies in the rural area of Bangladesh
- 2019
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Ingår i: International Journal of Environmental Research and Public Health. - : MDPI AG. - 1661-7827 .- 1660-4601. ; 16:23
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Tidskriftsartikel (refereegranskat)abstract
- This study explored the community perception of maternal deaths influenced by natural disaster (flood), and the practice of maternal complications during natural disaster among the rural population in Bangladesh. It also explored the challenges faced by the community for providing healthcare and referring the pregnant women experiencing complications during flood disaster. Three focus group discussions (FGDs) and eight in-depth interviews (IDIs) were conducted in the marginalized rural communities in the flood-prone Khaliajhuri sub-district, Netrakona district, Bangladesh. Flood is one of the major risk factors for influencing maternal death. Pregnant women seriously suffer from maternal complications, lack of antenatal checkup, and lack of doctors during flooding. During the time of delivery, it is difficult to find a skilled attendant, and referring the patient with delivery complications to the healthcare facility. Boats are the only mode of transport. The majority of maternal deaths occur on the boats during transfer from the community to the hospital. Rural people feel that the maternal deaths influenced by natural disaster are natural phenomena. Pre-preparation is needed to support pregnant women during disasters. There is unawareness of maternal health, related care, and complications during disasters among local health service providers and volunteers.
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| 6. |
- Al-Saffar, Anas Kh. 1969-, et al.
(författare)
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Concurrent small and large intestinal permeability in inflammatory bowel disease : Hyper-permeability in IBD
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Annan publikation (populärvet., debatt m.m.)abstract
- Hyper-permeability in inflammatory bowel disease (IBD) has mostly been explored in the colon, where symptomatic inflammation is prevalent. Relationships between small and large intestine barrier function were examined. Fasted (4h) IBD (19 ulcerative colitis, 11 Crohn's disease) and 25 healthy control subjects’ were investigated. Lactulose (10g), mannitol (5g), riboflavin (0.05g) and sucralose (5g) were ingested with 500 mL water. Urine lactulose and mannitol were measured by enzyme assays, riboflavin by intrinsic fluorescence and sucralose by HPLC. CRP was measured by nephelometry. In IBD, small intestine lactulose and sucralose % recoveries were 1.77 and 2.73 fold higher than controls; combined data revealed the two probes were correlated (R2=0.6). In IBD, large intestine sucralose % recovery was 2.6 fold higher than controls and correlated with small intestine sucralose % recovery (R2=0.6). Conclusions: Sucralose yields similar result as lactulose for small intestine permeability, while having higher S:N, implying sucralose is more sensitive. No evidence was found for riboflavin malabsorption in IBD. There is concurrent small and large intestine hyper-permeability in IBD. Small intestine hyper-permeability is presumably related to inflammation in the large intestine, but without obvious deficiency in transporter mediated micronutrient absorption (i.e., riboflavin) in the small intestine.
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| 7. |
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| 8. |
- Biswas, Animesh, et al.
(författare)
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Gestational diabetes : Exploring the perceptions, practices and barriers of the community and healthcare providers in rural Bangladesh: A qualitative study
- 2020
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Ingår i: Diabetes, Metabolic Syndrome and Obesity. - 1178-7007. ; 13, s. 1339-1348
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Tidskriftsartikel (refereegranskat)abstract
- Background and Objective: Gestational Diabetes Mellitus (GDM) is a prevalent and important disease during pregnancy and has detrimental effects on both the mother and the baby. The current study explored the perception and attitude of the community people about GDM and describes the challenges and gaps in knowledge, availability and accessibility of services for GDM screening and management at a rural community in Bangladesh. Methods: We performed a qualitative study including seven Focus Group Discussions (FGDs) and eight Key Informant Interviews (KIIs) from November 2017 to January 2018 at randomly selected areas of Tangail district. A highly trained team including two anthro-pologists conducted the qualitative studies (FGDs and KIIs) under the guidance of experienced researchers. Thematic analysis was performed. Results: GDM is not a known term for pregnant women, their husbands, mothers, and mothers-in-law. Most of the participants (78.7%) did not even hear the term. Some of them (25.5%) perceived that GDM will persist for whole life and transmit from husband to wife and mother to baby. Some people (21.3%) thought that GDM entirely depends on the wish of the God. Most of the participants (68.1%) perceived that symptoms of other types of diabetes and GDM are almost the same. Some participants (19.1%) thought that GDM patients need to intake some medicines that might affect the fetus. The majority of the respondents (83%) had no idea when a pregnant woman should test her diabetes during pregnancy. If GDM diagnosed, pregnant women decided to follow the advice of the doctors. The results from KII with health managers found that they lack in-depth knowledge of GDM. There is no structured guideline or protocol at their facilities for GDM management. Conclusion: The existing barriers at the communities for adequate detection and management of GDM are identified properly. The findings of this study will be helpful for the decision-makers in taking necessary actions to control the GDM.
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| 9. |
- Björner, Kajsa, et al.
(författare)
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High iNOS and IL-1β immunoreactivity are features of colitis-associated colorectal cancer tumors, but fail to predict 5-year survival
- 2023
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Ingår i: Upsala Journal of Medical Sciences. - : Upsala Medical Society. - 0300-9734 .- 2000-1967. ; 128
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Inflammatory bowel disease (IBD; mainly ulcerative colitis and Crohn's disease) is associated with the development of colorectal cancer (CRC) referred to as colitis-associated colorectal cancer (CAC). In inflammatory flares of IBD, the production of luminal nitric oxide (NO) increases due to the increased inducible nitric oxide synthase (iNOS) activity in inflamed tissue. It is believed that iNOS parallels pro-inflammatory interleukin-1β (IL-1β). How these biomarkers relate to CAC pathogenesis or survival is unknown.AIM: The primary aim of this study was to investigate iNOS and IL-1β immunoreactivity in CAC tumors in comparison with CRC and normal colonic mucosa, and the secondary aim was to determine if immunoreactivity correlates with 5-year survival of CAC.METHODS: Immunohistochemistry was performed on tissue sections as follows: CAC (n = 59); sporadic CRC (sCRC) (n = 12); colonic mucosa >2 cm outside sCRC margin (normal mucosa) (n = 22); paracancerous IBD (pIBD) (n = 12). The expression of iNOS and IL-1β was quantified separately for epithelium and stroma. Data were evaluated using the Mann-Whitney U-test and the log-rank test for 5-year Kaplan-Meier survival curves. Results were compared with online mRNA databases.RESULTS: Immunoreactivity occurred predominantly in epithelial cells and to lesser extent in stroma. Compared with normal mucosa, immunoreactivity for iNOS (P < 0.01) and IL-1β (P < 0.005) was higher in CAC epithelium. In CAC stroma, iNOS immunoreactivity was lower than normal mucosa (P < 0.001), whereas IL-1β was higher (P < 0.05). Immunoreactivity differences of iNOS or IL-1β among CAC patients failed to correlate with 5-year survival. These findings were supported by online mRNA databases.CONCLUSION: Consistent with high NO production in IBD, there is more iNOS in CAC epithelium, albeit not in stroma. This immunoreactivity difference exists for IL-1β in both epithelium and stroma. The intervention of arginine or iNOS activity for CAC chemotherapy is not straightforward.
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| 10. |
- Diaz Tartera, Hetzel O., et al.
(författare)
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Validation of SmartPill® wireless motility capsule for gastrointestinaltransit time : Intra-subject variability, software accuracy and comparison with video capsule endoscopy
- 2017
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Ingår i: Neurogastroenterology and Motility. - : Wiley. - 1350-1925 .- 1365-2982. ; 29:10
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: There is interest in ultimately combining endoscopy and motility assessments. Gastric emptying (GET), small bowel (SBTT), colon (CTT) and whole gut transit (WGTT) times are conveniently obtained by SmartPill® wireless motility capsule (WMC) that records luminal pH, temperature and pressure. Reproducibility within same subjects and accuracy of software derived times (MotiliGI® ) were investigated for diagnostic application. GET and SBTT were separately measured using video capsule endoscopy (VCE). The aim of this investigation was to assess same subject reproducibility of WMC, accuracy of software derived transit times and relate to Pillcam® SB (small bowel) VCE motility data.METHODS: Seventy three healthy adults ingested a 260 kcal mixed meal followed by WMC tests. Food intake was permitted after 6 hours. Regional transit data was obtained for GET, SBTT and CTT, the sum yielding WGTT. Nineteen subjects repeated WMC tests 2 or 4 weeks later; a separate 70 underwent VCE while fasted.KEY RESULTS: Visually derived data from WMC yielded GET 3.46±0.27, SBTT 5.15±0.21, CTT 20.76±1.19 and WGTT 29.53±1.28 hours (mean±SEM). Pearson's correlation coefficients (r) against software derived results were: GET 0.78 (P<.0001), SBTT 0.28 (P<.05), CTT 0.96 (P<.0001), WGTT 0.99 (P<.0001). VCE yielded lower GET (0.71±0.08 hours) and SBTT (4.15±0.13 hours).CONCLUSIONS AND INFERENCES: GET, SBTT, CTT and WGTT obtained by WMC are commensurate with literature values, including by other methods. Visually and software derived transit times have strongest correlations for CTT and WGTT. WMC yields longer GET and SBTT than VCE, perhaps due to meal related effects on motility.
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