MK-677 (Ibutamoren) Research Standard

MK-677 (Ibutamoren mesylate) is a potent, non-peptide, orally bioavailable agonist of the growth hormone secretagogue receptor (GHS-R1a). Originally developed as a ghrelin mimetic, it acts upstream of the growth hormone (GH) axis to stimulate endogenous GH release, subsequently elevating circulating IGF-1 levels. Because of its well-characterized pharmacokinetic profile and selective activation of the GHS-R1a, MK-677 is a foundational reference compound in endocrine pharmacology, signaling research, and metabolic studies.

Technical Specifications

Mechanism of Action & Research Context

MK-677 functions as a non-peptide ghrelin mimetic, interacting directly with GHS-R1a to modulate the endocrine system.

• Receptor Selectivity: Acts as a selective agonist at the GHS-R1a, triggering sustained, pulsatile growth hormone secretion.

• GH/IGF-1 Axis: Stimulates endogenous release of growth hormone without functioning as an exogenous GH source, facilitating studies on the regulation of the GH/IGF-1 axis.

• Metabolic Regulation: Targeted activation in GHS-R1a-expressing regions provides insights into appetite regulation, metabolic signaling, and endocrine feedback loops.

Research Applications

MK-677 serves as a benchmark tool in laboratory settings for investigating the ghrelin receptor and broader endocrine pharmacology.

Primary fields of in vitro and in vivo laboratory investigation include:

• GHS-R1a Signaling: Examining receptor binding, signal transduction, and transactivation pathways.

• Endocrine Pharmacology: Researching the modulation of the GH/IGF-1 axis and comparative potency of various secretagogues (e.g., capromorelin, anamorelin).

• Metabolic Research: Investigating ghrelin receptor signaling in appetite regulation and metabolic homeostasis.

• ADME Research: Utilizing the well-defined pharmacokinetic profile for in vitro metabolism, drug absorption, and bioavailability studies.

Storage & Handling Guidelines

Store at controlled room temperature. Keep tightly closed. Liquid formats: do not refrigerate or freeze. Cold storage may cause the solution to cloud or precipitate. If this occurs, return to room temperature and mix until clear.

Storage guidance is a house recommendation. Analytical documentation is per-lot release testing.