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Calcitonin Gene-Related Peptide ( CGRP )

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Calcitonin Gene-Related Peptide (CGRP) Introduction: CGRP belongs to calcitonin family of peptides which are of two types, α-CGRP (extensively studied) and β-CGRP. Alfa-CGRP is a 37-amino acid peptide that is produced from alternative splicing (1) of CGRP gene located on chromosome number 11. Beta-CGRP changes in 3 amino acids and encoded by a separate gene.(2) Synthesis: There are two forms of CGRP found, one is alfa CGRP and other is beta CGRP. Alfa CGRP contrast only by 3 amino acids but share related homology. (3,4,5 ) Alfa CGRP is the main form and is present in the CNS and PNS while Beta CGRP is mainly present in enteric nervous system.(6,7) They are synthesizes from genes at different location on chromosome number 11. (8) The CALC1 …show more content…

(16) CGRP binding to CLR is brought about by RAMP 1 that is a small single transmembrane protein. (17-19) Binding of CGRP to its receptor results in increase level of cyclic AMP. (4, 16) Regulation Mitogen activated protein kinases signaling pathway [MAPK] (20), cytokines (e.g. TNF-alfa) (21) and inducible nitric oxide synthase ( iNOS)(22) control the regulation of calcitonin gene-related peptide. CGRP Release ➢ In TMJ disorder, migraine, cardiac failure, hypertension and sepsis CGRP levels were found to be increased. ➢ Norepinephrine causes release of CGRP. ➢ Ankyrin 1 (TRPA1 ) releases CGRP ➢ CGRP level increases in pregnant woman. ➢ High levels of CGRP found in postmenopausal women.. ➢ In medullary thyroid carcinoma flushing episodes, may be result from high CGRP levels. ➢ During kidney dialysis CGRP concentration may increases. ➢ Increased amount of CGRP released at night CGRP has role in circadian rhythm. ➢ Administration of the angiotensin 2 to normotensive humans may result in dose-dependent increase in plasma CGRP levels, in parallel with a high blood pressure induced by Angiotensin 2. ➢ During exercise CGRP levels may increase. ➢ Sumatriptan, increase intracellular calcium, which cause decreases in CGRP promoter activity. ➢ Botulinum toxin type A decreases CGRP release ➢ Telcagepant (Receptor blocker) reduces the effects of CGRP SITES OF CGRP PRODUCTION: ➢ Trigeminal

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