- Macimorelin acetate
- Drug Entry
Macimorelin, a novel and orally active ghrelin mimetic that stimulates GH secretion, is used in the diagnosis of adult GH deficiency (AGHD). More specifically, macimorelin is a peptidomimetic growth hormone secretagogue (GHS) that acts as an agonist of GH secretagogue receptor, or ghrelin receptor (GHS-R1a) to dose-dependently increase GH levels 3. Growth hormone secretagogues (GHS) represent a new class of pharmacological agents which have the potential to be used in numerous clinical applications. They include treatment for growth retardation in children and cachexia associated with chronic disease such as AIDS and cancer.
Growth hormone (GH) is classically linked with linear growth during childhood. In deficiency of this hormone, AGHD is commonly associated with increased fat mass (particularly in the abdominal region), decreased lean body mass, osteopenia, dyslipidemia, insulin resistance, and/or glucose intolerance overtime. In addition, individuals with may be susceptible to cardiovascular complications from altered structures and function 5. Risk factors of AGHD include a history of childhood-onset GH deficiency or with hypothalamic/pituitary disease, surgery, or irradiation to these areas, head trauma, or evidence of other pituitary hormone deficiencies 3. While there are various therapies available such as GH replacement therapy, the absence of panhypopituitarism and low serum IGF-I levels with nonspecific clinical symptoms pose challenges to the detection and diagnosis of AGHD. The diagnosis of AGHD requires biochemical confirmation with at least 1 GH stimulation test 3. Macimorelin is clinically useful since it displays good stability and oral bioavailability with comparable affinity to ghrelin receptor as its endogenous ligand. In clinical studies involving healthy subjects, macimorelin stimulated GH release in a dose-dependent manner with good tolerability 3.
Macimorelin, developed by Aeterna Zentaris, was approved by the FDA in December 2017 under the market name Macrilen for oral solution.
- Accession Number
- Not Available
- CAS Number
- Average: 534.617
- Chemical Formula
- InChI Key
- IUPAC Name
- (2R)-2-(2-amino-2-methylpropanamido)-3-(1H-indol-3-yl)-N-[(1R)-2-(1H-indol-3-yl)-1-formamidoethyl]propanamide; acetic acid
- Predicted Properties
Property Value Source Water Solubility 0.00616 mg/mL ALOGPS logP 1.77 ALOGPS logP 1.67 ChemAxon logS -4.9 ALOGPS pKa (Strongest Acidic) 12.4 ChemAxon pKa (Strongest Basic) 8.34 ChemAxon Physiological Charge 1 ChemAxon Hydrogen Acceptor Count 4 ChemAxon Hydrogen Donor Count 6 ChemAxon Polar Surface Area 144.9 Å2 ChemAxon Rotatable Bond Count 9 ChemAxon Refractivity 133.14 m3·mol-1 ChemAxon Polarizability 49.05 Å3 ChemAxon Number of Rings 4 ChemAxon Bioavailability 0 ChemAxon Rule of Five No ChemAxon Ghose Filter No ChemAxon Veber's Rule No ChemAxon MDDR-like Rule Yes ChemAxon