| 1. |
- Hansson, A., et al.
(författare)
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The direction of human mesenchymal stem cells into the chondrogenic lineage is influenced by the features of hydrogel carriers
- 2017
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Ingår i: Tissue and Cell. - : Elsevier BV. - 1532-3072 .- 0040-8166. ; 49:1, s. 35-44
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Tidskriftsartikel (refereegranskat)abstract
- Low back pain is a major public health issue in the Western world, one main cause is believed to be intervertebral disc (IVD) degeneration. To halt/diminish IVD degeneration, cell therapy using different biomaterials e.g. hydrogels as cell carriers has been suggested. In this study, two different hydrogels were examined (in vitro) as potential cell carriers for human mesenchymal stem cells (hMSCs) intended for IVD transplantation. The aim was to investigate cell- survival and chondrogenic differentiation of hMSCs when cultured in hydrogels Puramatrix((R)) or Hydromatrix((R)) and potential effects of stimulation with growth hormone (GH). hMSCs/hydrogel cultures were investigated for cell-viability, attachment, gene expressionof chondrogenic markers SOX9, COL2A1, ACAN and accumulation of extracellular matrix (ECM). In both hydrogel types, hMSCs were viable for 28 days, expressed integrin beta 1 which indicates adhesion of hMSCs. Differentiation was observed into chondrocyte-like cells, in a higher extent in hMSCs/Hydromatrix((R)) cultures when compared to hMSCs/Puramatrix ((R)) hydrogel cultures. Gene expression analyses of chondrogenic markers verified results. hMSCs/hydrogel cultures stimulated with GH displayed no significant effects on chondrogenesis. In conclusion, both hydrogels, especially Hydromatrix((R)) was demonstrated as a promising cell carrier in vitro for hMSCs, when directed into chondrogenesis. This knowledge could be useful in biological approaches for regeneration of degenerated human IVDs.
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| 2. |
- Finazzi, Giovanni, et al.
(författare)
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Ions channels/transporters and chloroplast regulation.
- 2015
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Ingår i: Cell Calcium. - : Elsevier BV. - 0143-4160 .- 1532-1991. ; 58:1, s. 86-97
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Tidskriftsartikel (refereegranskat)abstract
- Ions play fundamental roles in all living cells and their gradients are often essential to fuel transports, to regulate enzyme activities and to transduce energy within and between cells. Their homeostasis is therefore an essential component of the cell metabolism. Ions must be imported from the extracellular matrix to their final subcellular compartments. Among them, the chloroplast is a particularly interesting example because there, ions not only modulate enzyme activities, but also mediate ATP synthesis and actively participate in the building of the photosynthetic structures by promoting membrane-membrane interaction. In this review, we first provide a comprehensive view of the different machineries involved in ion trafficking and homeostasis in the chloroplast, and then discuss peculiar functions exerted by ions in the frame of photochemical conversion of absorbed light energy.
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| 3. |
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| 4. |
- Hellman, Bo, et al.
(författare)
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Somatostatin promotes glucose generation of Ca2+ oscillations in pancreatic islets both in the absence and presence of tolbutamide
- 2018
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Ingår i: Cell Calcium. - : Elsevier BV. - 0143-4160 .- 1532-1991. ; 74, s. 35-42
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Tidskriftsartikel (refereegranskat)abstract
- Many cellular processes, including pulsatile release of insulin, are triggered by increase of cytoplasmic Ca2+. This study examines how somatostatin affects glucose generation of cytoplasmic Ca2+ oscillations in mouse islets in absence and presence of tolbutamide blockade of the K-ATP channels. Ca2+ was measured with dual wavelength microflurometry in isolated islets loaded with the indicator Fura-2. Rise of glucose from 3 to 20 mM evoked introductory lowering of Ca2+ prolonged by activation of somatostatin receptors. During continued superfusion exposure to somatostatin triggered oscillations mediated by periodic increase from the basal level (absence of tolbutamide) or by periodic interruption of an elevated level (presence of tolbutamide). In the latter situation the oscillations were transformed into sustained elevation by activation of muscarinic receptors (acetylcholine) or increase of cyclic AMP (IBMX, 8-bromo-cyclic AMP, forskolin). The observed effect of cyclic AMP raises the question whether high proportions of the glucagon-producing alpha-cells promote steady-state elevation of Ca2+. In support for this idea somatostatin was found to trigger glucose-induced Ca2+ oscillations essentially in small islets that contain very few alpha-cells. The results indicate that somatostatin promotes glucose generation of Ca2+ oscillations with similar characteristics both in the absence and presence of functional K-ATP channels.
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| 5. |
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| 6. |
- Fryk, Emanuel, et al.
(författare)
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Microdialysis and proteomics of subcutaneous interstitial fluid reveals increased galectin-1 in type 2 diabetes patients
- 2016
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Ingår i: Metabolism-Clinical and Experimental. - : Elsevier BV. - 0026-0495 .- 1532-8600. ; 65:7, s. 998-1006
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Tidskriftsartikel (refereegranskat)abstract
- Objective. To identify a potential therapeutic target for type 2 diabetes by comparing the subcutaneous interstitial fluid from type 2 diabetes patients and healthy men. Methods. Proteomics was performed on the interstitial fluid of subcutaneous adipose tissue obtained by microdialysis from 7 type 2 diabetes patients and 8 healthy participants. 851 proteins were detected, of which 36 (including galectin-1) showed significantly altered expression in type 2 diabetes. We also measured galectin-1 expression in: (1) adipocytes isolated from adipose tissue biopsies from these participants; (2) subcutaneous adipose tissue of 24 obese participants before, during and after 16 weeks on a very low calorie diet (VLCD); and (3) adipocytes isolated from 6 healthy young participants after 4 weeks on a diet and lifestyle intervention to promote weight gain. We also determined the effect of galectin-1 on glucose uptake in human adipose tissue. Results. Galectin-1 protein levels were elevated in subcutaneous dialysates from type 2 diabetes compared with healthy controls (p < 0.05). In agreement, galectin-1 mRNA expression was increased in adipocytes from the type 2 diabetes patients (p < 0.05). Furthermore, galectin-1 mRNA expression was decreased in adipose tissue after VLCD (p < 0.05) and increased by overfeeding (p < 0.05). Co-incubation of isolated human adipocytes with galectin-1 reduced glucose uptake (p < 0.05) but this was independent of the insulin signal. Conclusion. Proteomics of the interstitial fluid in subcutaneous adipose tissue in vivo identified a novel adipokine, galectin-1, with a potential role in the pathophysiology of type 2 diabetes. (C) 2016 Elsevier Inc. All rights reserved.
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| 7. |
- Hastoy, B., et al.
(författare)
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Fusion pore in exocytosis: More than an exit gate? A beta-cell perspective
- 2017
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Ingår i: Cell Calcium. - : Elsevier BV. - 0143-4160. ; 68, s. 45-61
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Forskningsöversikt (refereegranskat)abstract
- Secretory vesicle exocytosis is a fundamental biological event and the process by which hormones (like insulin) are released into the blood. Considerable progress has been made in understanding this precisely orchestrated sequence of events from secretory vesicle docked at the cell membrane, hemifusion, to the opening of a membrane fusion pore. The exact biophysical and physiological regulation of these events implies a close interaction between membrane proteins and lipids in a confined space and constrained geometry to ensure appropriate delivery of cargo. We consider some of the still open questions such as the nature of the initiation of the fusion pore, the structure and the role of the Soluble N-ethylmaleimide-sensitive-factor Attachment protein REceptor (SNARE) transmembrane domains and their influence on the dynamics and regulation of exocytosis. We discuss how the membrane composition and protein-lipid interactions influence the likelihood of the nascent fusion pore forming. We relate these factors to the hypothesis that fusion pore expansion could be affected in type-2 diabetes via changes in disease-related gene transcription and alterations in the circulating lipid profile. Detailed characterisation of the dynamics of the fusion pore in vitro will contribute to understanding the larger issue of insulin secretory defects in diabetes.
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| 8. |
- Gardulf, A., et al.
(författare)
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The Nurse Professional Competence (NPC) Scale: Self-reported competence among nursing students on the point of graduation
- 2016
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Ingår i: Nurse Education Today. - : Elsevier BV. - 0260-6917 .- 1532-2793. ; 36, s. 165-171
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Tidskriftsartikel (refereegranskat)abstract
- Background: International organisations, e.g. WHO, stress the importance of competent registered nurses (RN) for the safety and quality of healthcare systems. Low competence among RNs has been shown to increase the morbidity and mortality of inpatients. Objectives: To investigate self-reported competence among nursing students on the point of graduation (NSPGs), using the Nurse Professional Competence (NPC) Scale, and to relate the findings to background factors. Methods and participants; The NPC Scale consists of 88 items within eight competence areas (CAs) and two overarching themes. Questions about socio-economic background and perceived overall quality of the degree programme were added. In total, 1086 NSPGs (mean age, 28.1[20-56] years, 87.3% women) from 11 universities/university colleges participated. Results: NSPGs reported significantly higher scores for Theme I "Patient-Related Nursing" than for Theme II "Organisation and Development of Nursing Care". Younger NSPGs (20-27 years) reported significantly higher scores for the CAs "Medical and Technical Care" and "Documentation and Information Technology". Female NSPGs scored significantly higher for "Value-Based Nursing". Those who had taken the nursing care programme at upper secondary school before the Bachelor of Science in Nursing (BSN) programme scored significantly higher on "Nursing Care", "Medical and Technical Care", "Teaching/Learning and Support", "Legislation in Nursing and Safety Planning" and on Theme I. Working extra paid hours in healthcare alongside the BSN programme contributed to significantly higher self-reported scores for four CAs and both themes. Clinical courses within the BSN programme contributed to perceived competence to a significantly higher degree than theoretical courses (932% vs 875% of NSPGs). Summary and conclusion: Mean scores reported by NSPGs were highest for the four CAs connected with patient-related nursing and lowest for CAs relating to organisation and development of nursing care. We conclude that the NPC Scale can be used to identify and measure aspects of self-reported competence among NSPGs. (C) 2015 Elsevier Ltd. All rights reserved.
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| 9. |
- Sartor, Hanna, et al.
(författare)
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Do pathological parameters differ with regard to breast density and mode of detection in breast cancer? The Malmö Diet and Cancer Study.
- 2015
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Ingår i: Breast. - : Elsevier BV. - 1532-3080. ; 24:1, s. 12-17
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Tidskriftsartikel (refereegranskat)abstract
- Our aim was to study how breast density relates to tumor characteristics in breast cancer with emphasis on mode of detection. Among 17,035 women in the Malmö Diet and Cancer Study 826 incident cases have been diagnosed (1991-2007). Data on tumor characteristics, mode of detection, and density at diagnosis were collected. Associations between density and tumor characteristics were analyzed using logistic and ordinal logistic regression models yielding OR and 95% CI. Adjustments for age at diagnosis, BMI at baseline, and the mode of detection, were performed. In denser breasts, large tumor size was more frequent (ORadj 1.59 (1.26-2.01)) as was lymph node involvement (ORadj 1.32 (1.00-1.74)). Further, the higher the density, the lower the grade (ORadj 0.73 (0.53-1.02) for having higher grade), in screening-detected invasive breast cancer. Our findings stress the importance of considering the impact of density in mammography image interpretation and the possible associations with tumor aggressiveness.
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| 10. |
- Hedelin, Maria, 1964, et al.
(författare)
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Prospective Study of Dietary Phytoestrogen Intake and the Risk of Colorectal Cancer
- 2016
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Ingår i: Nutrition and Cancer-an International Journal. - : Informa UK Limited. - 0163-5581 .- 1532-7914. ; 68:3, s. 388-395
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Tidskriftsartikel (refereegranskat)abstract
- Dietary phytoestrogen intake has been inversely associated with the risk of prostate and breast cancer and might also affect the risk of colorectal cancer. We evaluated the associations between dietary lignan intake, dietary isoflavonoid intake, dietary coumestrol intake, and dietary enterolignans and equol intake, and risk of colorectal cancer. Data from the Women's Lifestyle and Health (WLH) Cohort study was used. The WLH study is a prospective population-based cohort study including 48,268 Swedish women aged 30-49years at the time of enrolment in 1991-92. Follow-up for colorectal cancer incidence, death, and emigration until the end of 2010 was performed through record linkage to the Swedish Cancer Registry and Total Population Register. During follow-up 206 incident colorectal cancer cases were identified. Cox proportional hazards models were fitted to estimate adjusted risk ratios with 95% confidence intervals. We found no statistically significant association between the intake of dietary lignans, dietary isoflavonoids, coumestrol, or enterolignans and equol, and risk of colorectal cancer. We found no association between dietary phytoestrogen intake and the risk of colorectal cancer. However, since the number of cancer cases was small, our results need to be confirmed. Future studies should investigate colon and rectal cancer separately.
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