a 1(i) collagen , human

This is a peptide inhibitor of collagen fibrillar matrix assembly.

ALK5-IN-82 is a potent and selective inhibitor of activin receptor-like kinase 5 (ALK5), demonstrating an IC50 value of 9.1 nM. This compound effectively suppresses the expression of α-smooth muscle actin (α-SMA), collagen I, and the proteinases tissue inhibitor of metalloproteinase 1 (TIMP-1) and matrix metalloproteinase 13 (MMP-13) in human umbilical vein endothelial cells induced by transforming growth factor-β. ALK5-IN-82 shows potential for use in research related to cardiac fibrosis.

Pal-KTTKS is a lipidated pentapeptide consisting of a fragment of the type I collagen C-terminal propeptide conjugated to palmitic acid .1 It increases collagen production in human corneal and dermal fibroblasts when used at concentrations of 0.002, 0.004, and 0.008 wt%.2 Following topical administration, pal-KTTKS (50 μg/cm2) is found in the stratum corneum, epidermis, and dermis of isolated hairless mouse skin.1 It can self-assemble into flat tapes and extended fibrillar structures.3 Pal-KTTKS has been detected in anti-wrinkle creams.4 |1. Choi, Y.L., Park, E.J., Kim, E., et al. Dermal stability and in vitro skin permeation of collagen pentapeptides (KTTKS and palmitoyl-KTTKS). Biomol. Ther. (Seoul) 22(4), 321-327 (2014).|2. Jones, R.R., Castelletto, V., Connon, C.J., et al. Collagen stimulating effect of peptide amphiphile C16-KTTKS on human fibroblasts. Mol. Pharm. 10(3), 1063-1069 (2013).|3. Castelletto, V., Hamley, I.W., Whitehouse, C., et al. Self-assembly of palmitoyl lipopeptides used in skin care products. Langmuir 29(29), 9149-9155 (2013).|4. Chirita, R.-I., Chaimbbault, P., Archambault, J.-C., et al. Development of a LC-MS/MS method to monitor palmitoyl peptides content in anti-wrinkle cosmetics. Anal. Chim. Acta 641(1-2), 95-100 (2009).

Angiotensin II human TFA is a potent vasoconstrictor in the renin-angiotensin system that regulates blood pressure through interactions with AT1R and AT2R receptors. It activates sympathetic nerve activity, promotes aldosterone synthesis and renal function, induces proliferation of vascular smooth muscle cells, and enhances type I and III collagen production in fibroblasts, leading to vascular and myocardial thickening and fibrosis. It also triggers apoptosis and promotes capillary formation, making it suitable for establishing models of cardiac hypertrophy, hypertension, and abdominal aortic aneurysm.

H-Gly-Pro-Hyp-OH is a potent and orally available anti-photoaging collagen peptide that attenuates inflammation and reduces MMP-1 and MMP-3 levels; attenuates H2O2-induced aging of dermal fibroblasts; restores cortisol-mediated inhibition of type I collagen and GR activation and (TGF)-β signaling signaling, among other things; and improves the hydration of human skin, elasticity and anti-wrinkle properties.