Peptide research · Compound guide
B7-33 Research Guide
Explore the mechanisms, study findings and evidence limits behind this research topic.
Product artwork identifies the SRP listing. It does not demonstrate safety or clinical benefit. The evidence guide and its sources follow below.
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Receptor, cell and animal evidence
Evidence reviewed September 13, 2026.
Research overview and identity
B7-33 is a single-chain derivative of human relaxin-2 designed to simplify a more complex two-chain hormone. Researchers use it to examine relaxin receptor signaling and fibrotic tissue remodeling.
Mechanism under investigation
The original work describes functionally selective activation of RXFP1-associated signaling. Responses depended on the cellular system, including receptor interactions and downstream ERK and matrix-remodeling activity. Receptor activity in a laboratory model is not proof of tissue repair in patients.
What the studies report
The development study reported prevention or reversal of fibrosis-related changes in rodent heart and lung models. A separate 2023 mouse cardiomyopathy study compared B7-33, relaxin and perindopril, reporting differences in fibrosis and other cardiovascular measurements under those experimental conditions. [1] [2]
Limits of the evidence
These studies support a preclinical research direction. They do not show that B7-33 is superior to established cardiovascular treatment in people. Species, injury model, timing, comparator exposure and measured endpoint all limit that interpretation; human efficacy and safety cannot be inferred from the rodent findings.
Matching research material to a paper
Check the material identity, formulation and analytical methods against the study methods. A product name or milligram amount alone does not demonstrate experimental equivalence. Published research does not establish the identity, purity or potency of a retail batch; batch-specific analytical documentation must be assessed separately.
For laboratory research only. Not for human or veterinary use. This guide is educational and contains no dosing, reconstitution or administration instructions.
Sources and further reading
- Hossain et al. — single-chain relaxin derivative and selective RXFP1 signaling
- Alam et al. — B7-33 in experimental mouse cardiomyopathy (2023)