Scientific Reference
CJC-1295 (without DAC)
Evidence profile: Controlled human evidence
CJC-1295 without DAC, also called modified GRF (1-29), is a 29-residue synthetic analogue of growth hormone-releasing hormone (GHRH). Native GHRH has 44 residues, but its first 29 carry the receptor-binding activity, and this peptide is built on that shortened sequence with four amino-acid substitutions intended to slow breakdown. The name causes confusion: CJC-1295 originally referred to a version carrying a drug affinity complex (DAC), a reactive linker that binds albumin and greatly prolongs circulation. The form described here lacks that linker. Human studies of the DAC version exist but are few; published work on the form without DAC is thinner still, and much of what is said about it is inferred from the parent hormone.
Mechanism of Action
Like native GHRH, the peptide has been reported to bind the GHRH receptor, a class B G protein-coupled receptor on somatotroph cells of the anterior pituitary. Receptor activation couples to Gs, raising intracellular cAMP and releasing stored growth hormone; circulating growth hormone in turn drives IGF-1 production, mainly in the liver. The substitutions, D-alanine at position 2, glutamine at 8, alanine at 15 and leucine at 27, were chosen to resist cleavage by dipeptidyl peptidase-4 and to reduce deamidation and oxidation at vulnerable residues. Without the albumin-binding linker its half-life is short, and pharmacokinetic data specific to this form are sparse.
Molecular Information
- Type: GHRH analog (Modified GRF 1-29)
- Molecular weight: 3647.2 g/mol
- Molecular formula: C165H269N47O46
Published Research
Prolonged stimulation of growth hormone (GH) and insulin-like growth factor I secretion by CJC-1295, a long-acting analog of GH-releasing hormone, in healthy adults
Teichman SL et al. · The Journal of clinical endocrinology and metabolism · 2006 · Clinical
PMID 16352683 — View on PubMedPulsatile secretion of growth hormone (GH) persists during continuous stimulation by CJC-1295, a long-acting GH-releasing hormone analog
Ionescu M et al. · The Journal of clinical endocrinology and metabolism · 2006 · Clinical
PMID 17018654 — View on PubMed