B7-33
B7-33 is a synthetic research peptide based on the H2 relaxin family, designed to replicate some of the beneficial effects of the natural hormone relaxin. B7-33 is engineered to target the relaxin receptor RXFP1, to activate specific protective and signalling responses in experimental models. This peptide has mainly been studied for its effects on cardiovascular and fibrotic pathways.
B7-33
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B7-33 is a synthetic research peptide based on the H2 relaxin family, designed to replicate some of the beneficial effects of the natural hormone relaxin. B7-33 is engineered to target the relaxin receptor RXFP1, to activate specific protective and signalling responses in experimental models. This peptide has mainly been studied for its effects on cardiovascular and fibrotic pathways.
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B7-33 is a single-chain peptide analog of human relaxin-2 that targets and activates the relaxin family peptide receptor 1 (RXFP1).
When B7-33 activates RXFP1, it triggers signalling pathways that help reduce fibroblast activity and lower collagen buildup. It also supports tissue remodelling by increasing matrix metalloproteinase (MMP) activity, improves blood vessel relaxation through nitric oxide production, and modulates inflammatory cytokine levels in experimental models.
Compared to natural relaxin-2, B7-33 shows a different signalling profile. It tends to favour activation of the pERK1/2 pathway while producing weaker cAMP signalling. This suggests it acts as a biased agonist at the RXFP1 receptor.
Research areas:
- How β-arrestin is recruited and how the receptor changes shape during activation
- Examining ERK1/2 and Akt signalling activity in heart muscle cells
- Analyzing gene expression linked to heart growth and protective effects
- Testing collagen buildup and how the extracellular matrix is remodelled
- Investigating mitochondrial health and how cell death is controlled in stressed heart tissue
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