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The connecting peptide, or C-peptide, is a short 31-amino-acid polypeptide that connects insulin's A-chain to its B-chain in the proinsulin molecule. In the context of diabetes or hypoglycemia, a measurement of C-peptide blood serum levels can be used to distinguish between different conditions with similar clinical features.
Natriuretic peptide precursor C, also known as NPPC, is a protein that in humans is encoded by the NPPC gene. [ 5 ] [ 6 ] [ 7 ] The precursor NPPC protein is cleaved to the 22 amino acid peptide C-type natriuretic peptide ( CNP ).
The natriuretic peptide CNP was initially discovered in pig brain extracts. Most CNP is found in the brain, although it can also be found in chondrocytes and the blood vessel lining cells. The human gene for CNP (NPPC), in contrast to the genes for ANP and BNP, is located on chromosome 2 and consists of just two exons and one intron. [ 3 ]
Brain natriuretic peptide (BNP), also known as B-type natriuretic peptide, is a hormone secreted by cardiomyocytes in the heart ventricles in response to stretching caused by increased ventricular blood volume. [5] BNP is one of the three natriuretic peptides, in addition to atrial natriuretic peptide and C-type natriuretic peptide ( CNP). [6]
Protein C, also known as autoprothrombin IIA and blood coagulation factor XIV, [5]: 6822 [6] is a zymogen, that is, an inactive enzyme.The activated form plays an important role in regulating anticoagulation, inflammation, and cell death and maintaining the permeability of blood vessel walls in humans and other animals.
Its main function is the stimulation of the pituitary synthesis of adrenocorticotropic hormone (ACTH), as part of the hypothalamic–pituitary–adrenal axis (HPA axis). Corticotropin-releasing hormone (CRH) is a 41-amino acid peptide derived from a 196-amino acid preprohormone.