GDF-8 (Growth Differentiation Factor 8), also known as Myostatin, is a recombinant protein belonging to the transforming growth factor-beta (TGF-beta) superfamily. The mature bioactive form exists as a disulfide-linked homodimer with an approximate molecular weight of 25,000 g/mol, comprising two 109-amino acid monomers. Each monomer contains the canonical seven-cysteine motif common to TGF-beta superfamily members. Produced via recombinant expression in E. coli, Myostatin signals through activin type II receptors (ActRIIA and ActRIIB) and is one of the most extensively studied negative regulators of skeletal muscle mass in preclinical research.

GDF-8 has been extensively investigated in preclinical musculoskeletal biology and metabolic research. Published in vitro studies in primary human myotube and C2C12 myoblast cell preparations have investigated GDF-8’s receptor binding characteristics at ActRIIB and downstream SMAD2/3 phosphorylation cascades, documenting myostatin-mediated inhibitory signalling and suppression of myoblast differentiation and myotube growth parameters under controlled experimental conditions [1]. The observation that targeted disruption of the GDF-8 gene in rodent models produces widespread increases in skeletal muscle mass has made Myostatin a key reference compound in studies examining muscle homeostasis, satellite cell quiescence, and the balance between anabolic and catabolic signalling within the TGF-beta pathway. Research has also examined GDF-8’s interaction with endogenous antagonists including Follistatin, with published rodent transgenic model studies documenting that Follistatin-mediated antagonism of myostatin activity produces widespread skeletal muscle increases consistent with those observed following targeted gene disruption, characterising the molecular determinants of ligand-antagonist engagement within the GDF-8 regulatory axis [2].

GDF-8 is manufactured in a cGMP compliant laboratory to a guaranteed purity of 98% or above. Every batch is independently tested using HPLC and MS-UPLC analysis before dispatch. Vials are vacuum sealed and stored in a temperature controlled, monitored cold storage system. Certificates of Analysis are available on request.

Sold strictly for in vitro research purposes only. Not for human consumption. Intended for use by qualified researchers in laboratory settings only.

Editorial Team

Dr. Martina Rossi, PhD

Scientific Contributor and Reviewer

Reviewed and approved 14 June 2026

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