3-Methylmethcathinone (3MMC)

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Formal Name: 2-(methylamino)-1-(3-methylphenyl)-1-propanone, monohydrochloride

CAS Number: 1246816-62-5

Molecular Formula: C11H15NO • HCl

Formula Weight: 213.7

Purity: ≥97%

Formulation: A crystalline solid

Clear

Description

3-Methylmethcathinone

3-Methylmethcathinone, also known as 3-MMC and 3-mephedrone, is a designer drug from the substituted cathinone family. 3-MMC is closely related in structure to the more common illicit drug mephedrone (4-MMC) and is illegal in most countries that have banned mephedrone as it is a structural isomer of it. However, 3-MMC has still appeared on the recreational drug market as an alternative to mephedrone and was first identified as being sold in Sweden in 2012. Unlike other legal highs, 3-MMC was tested and characterized in large mammals, providing much more knowledge about it than is known about other synthetic cathinones. 3-Methylmethcathinone or 3-MMC is a monoamine transporter substrate that potently inhibits norepinephrine uptake and displays more pronounced dopaminergic vs. serotonergic activity.

3-Methylmethcathinone (3-MMC or metaphedrone) has become one of the most popular recreational drugs worldwide after the ban of mephedrone, and was recently deemed responsible for several intoxications and deaths. This study aimed at assessing the hepatotoxicity of 3-MMC. For this purpose, Wistar rat hepatocytes were isolated by collagenase perfusion, cultured and exposed for 24 h at a concentration range varying from 31 nM to 10 mM 3-MMC. The modulatory effects of cytochrome P450 (CYP) inhibitors on 3-MMC hepatotoxicity were evaluated. 3-MMC-induced toxicity was perceived at the lysosome at lower concentrations (NOEC 312.5 µM), compared to mitochondria (NOEC 379.5 µM) and cytoplasmic membrane (NOEC 1.04 mM). Inhibition of CYP2D6 and CYP2E1 diminished 3-MMC cytotoxicity, yet for CYP2E1 inhibition this effect was only observed for concentrations up to 1.3 mM. A significant concentration-dependent increase of intracellular reactive species was observed from 10 μM 3-MMC on; a concentration-dependent decrease in antioxidant glutathione defences was also observed. At 10 μM, caspase-3, caspase-8, and caspase-9 activities were significantly elevated, corroborating the activation of both intrinsic and extrinsic apoptosis pathways. Nuclear morphology and formation of cytoplasmic acidic vacuoles suggest prevalence of necrosis and autophagy at concentrations higher than 10 μM. No significant alterations were observed in the mitochondrial membrane potential, but intracellular ATP significantly decreased at 100 μM. Our data point to a role of metabolism in the hepatotoxicity of 3-MMC, which seems to be triggered both by autophagic and apoptotic/necrotic mechanisms. This work is the first approach to better understand 3-MMC toxicology.

Keywords: 3-Methylmethcathinone (3-MMC or metaphedrone); Apoptosis; Autophagy; Hepatotoxicity; Oxidative stress; Synthetic cathinone.

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