Probing ion channel activity of human islet amyloid polypeptide (amylin)
نویسندگان
چکیده
منابع مشابه
Islet amyloid polypeptide (amylin) is expressed in sensory neurons.
Islet amyloid polypeptide (IAPP) or amylin is a hormone candidate predominantly expressed in insulin cells. A role for IAPP in the regulation of glucose homeostasis and the development of non-insulin-dependent diabetes mellitus has been proposed. IAPP is structurally related to the sensory neuropeptide calcitonin gene-related peptide. In the present study, using in situ hybridization, immunocyt...
متن کاملIslet amyloid polypeptide/amylin messenger RNA and protein expression in human insulinomas in relation to amyloid formation.
OBJECTIVE Islet amyloid polypeptide (IAPP), also named amylin, is the predominant protein component of amyloid deposits in human islet beta cell tumours of the pancreas (insulinomas). IAPP is co-produced with insulin by islet beta cells. We investigated IAPP expression in relation to insulin expression and to amyloid formation in eleven insulinomas. DESIGN AND METHODS RNA and protein extracts...
متن کاملInhibitors can arrest the membrane activity of human islet amyloid polypeptide independently of amyloid formation.
Human islet amyloid polypeptide (hIAPP), co-secreted with insulin from pancreatic beta cells, misfolds to form amyloid deposits in non-insulin-dependent diabetes mellitus (NIDDM). Like many amyloidogenic proteins, hIAPP is membrane-active: this may be significant in the pathogenesis of NIDDM. Non-fibrillar hIAPP induces electrical and physical breakdown in planar lipid bilayers, and IAPP insert...
متن کاملAtomic structure of the cross-beta spine of islet amyloid polypeptide (amylin).
Human islet amyloid polypeptide (IAPP or amylin) is a 37-residue hormone found as fibrillar deposits in pancreatic extracts of nearly all type II diabetics. Although the cellular toxicity of IAPP has been established, the structure of the fibrillar form found in these deposits is unknown. Here we have crystallized two segments from IAPP, which themselves form amyloid-like fibrils. The atomic st...
متن کاملIslet amyloid polypeptide (amylin)-deficient mice develop a more severe form of alloxan-induced diabetes.
To examine whether islet amyloid polypeptide (IAPP), other than through amyloid formation, may be of importance in diabetes pathogenesis, IAPP-deficient mice (IAPP(-/-)) were challenged with alloxan (day 0). Diabetes in IAPP(-/-) mice was more severe at day 35, indicated by greater weight loss; glucose levels were higher in alloxan-treated IAPP(-/-) mice, whereas insulin levels were lower, indi...
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ژورنال
عنوان ژورنال: Biochimica et Biophysica Acta (BBA) - Biomembranes
سال: 2012
ISSN: 0005-2736
DOI: 10.1016/j.bbamem.2012.08.012