https://wikimd.com/index.php?action=history&feed=atom&title=ProinsulinProinsulin - Revision history2026-04-21T05:42:02ZRevision history for this page on the wikiMediaWiki 1.44.2https://wikimd.com/index.php?title=Proinsulin&diff=6320649&oldid=prevPrab: CSV import2025-02-18T05:04:58Z<p>CSV import</p>
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</table>Prabhttps://wikimd.com/index.php?title=Proinsulin&diff=5342534&oldid=prevPrab: CSV import2024-03-02T13:59:01Z<p>CSV import</p>
<p><b>New page</b></p><div>'''Proinsulin''' is a [[protein]] and a precursor to [[insulin]] produced by the [[pancreas]]. It is synthesized in the [[pancreatic beta cells]] and is crucial in the regulation of [[glucose metabolism]].<br />
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== Structure ==<br />
Proinsulin is a single-chain polypeptide consisting of 86 [[amino acids]]. It has three domains: an A-chain, a B-chain, and a connecting peptide known as the C-peptide. The A and B chains are connected by disulfide bonds, while the C-peptide is excised during the conversion of proinsulin to insulin.<br />
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== Synthesis and Secretion ==<br />
The synthesis of proinsulin begins in the [[rough endoplasmic reticulum]] (RER) where it is initially produced as preproinsulin. Preproinsulin is then converted into proinsulin in the RER lumen. Proinsulin is packaged into secretory vesicles in the [[Golgi apparatus]], where it is converted into insulin and C-peptide. These are then secreted into the bloodstream in response to an increase in blood glucose levels.<br />
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== Function ==<br />
Proinsulin itself has minimal insulin activity. Its primary function is to serve as a precursor to insulin. The conversion of proinsulin to insulin and C-peptide is a critical step in the regulation of glucose metabolism. The C-peptide is also believed to have biological activity, including the promotion of [[vasodilation]] and [[sodium excretion]].<br />
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== Clinical Significance ==<br />
Abnormal proinsulin levels can be indicative of various medical conditions. Elevated proinsulin levels can be seen in conditions such as [[type 2 diabetes]], [[insulinoma]], and [[polycystic ovary syndrome]]. Proinsulin testing is used in the diagnosis and management of these conditions.<br />
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[[Category:Proteins]]<br />
[[Category:Insulin]]<br />
[[Category:Endocrinology]]<br />
{{protein-stub}}<br />
{{medicine-stub}}</div>Prab