2. Signaling Pathways
  3. Neuronal Signaling
  4. Monoamine Oxidase
  5. MAO-A Isoform

MAO-A

Monoamine Oxidase A

Monoamine oxidase A (MAO-A) is a mitochondrial flavin-dependent enzyme that catalyzes the oxidative deamination of monoamine neurotransmitters and thereby regulates neurotransmitter homeostasis in the nervous system and peripheral tissues[1]. Mechanistically, MAO-A metabolizes serotonin and norepinephrine and contributes to dopamine turnover, generating aldehydes, ammonia, and hydrogen peroxide as metabolic by-products that influence cellular redox status and downstream biological responses[1][2]. Through its control of monoamine catabolism, MAO-A participates in neuropsychiatric and neurodegenerative pathways and has therefore become an important molecular target in neuroscience and drug discovery research[2][3]. In disease-related experimental systems, altered MAO activity has been associated with oxidative stress and tissue dysfunction, while pharmacological inhibition of MAO can modify neurotransmitter metabolism and related physiological outcomes[2][4]. Compared with the closely related isoform MAO-B, MAO-A shows higher substrate preference for serotonin and norepinephrine, whereas MAO-B preferentially metabolizes phenylethylamine and contributes differently to monoamine turnover, making isoform selectivity a critical consideration in experimental design and therapeutic development[3][5]. For experimental applications, selective MAO-A inhibitors such as clorgyline and moclobemide are widely used to investigate monoamine signaling, neurotransmitter metabolism, and MAO-dependent biological mechanisms, while reversible and irreversible inhibitor classes provide complementary pharmacological tools for mechanistic studies[4][6].

MAO-A Related Products (118):

Cat. No. Product Name Effect Purity
  • HY-152110
    AChE/MAO-IN-2
    		Inhibitor
    Dual AChE-MAO B-IN-5, indanone derivative, is a potent dual AChE/MAO-B inhibitior with IC50 values of 0.0224, 0.0412, and 0.1116 μM for AChE, MAO-B and MAO-A, respectively. Dual AChE-MAO B-IN-5 has antioxidant activity and prevents β-amyloid plaque aggregation. Dual AChE-MAO B-IN-5 can be used for Alzheimer’s disease (AD) research.
  • HY-174833
    MAO-A-IN-2
    		Inhibitor
    MAO-A-IN-2 (Compound 4l) is a selective monoamine oxidase A (MAO-A) inhibitor with an IC50 value of 0.4 μM. MAO-A-IN-2 reduces the degradation of monoamine neurotransmitters (e.g., serotonin, norepinephrine). MAO-A-IN-2 is promising for research of neurological diseases related to monoamine neurotransmitter imbalance such as depression and anxiety disorders.
  • HY-162760
    COMT-IN-1
    		Inhibitor
    COMT-IN-1 (compound C12), a nitrophenolic analogue, is an orally active dopamine metabolic enzyme catechol-O-methyltransferase (COMT) inhibitor with IC50s of 0.37 μM, 95.58 μM and 58.82 μM for COMT, MAO-A and MAO-B, respectively. COMT-IN-1 exhibits chelation with a variety of metal ions. COMT-IN-1 exhibits good BBB permeability. COMT-IN-1 improves dopamine levels and ameliorates MPTP (HY-15608)-induced Parkinson's disease (PD) symptoms in mice.
  • HY-184159
    AChE/BChE/MAO-A-IN-2
    		Inhibitor
    AChE/BChE/MAO-A-IN-2 is an AChE, BChE, and MAO-A inhibitor with IC50 values of 104.28 nM, 23.04 nM, and 215.50 nM, respectively. AChE/BChE/MAO-A-IN-2 exhibits selective antiproliferative activity against cancer cells and low toxicity toward normal cells. AChE/BChE/MAO-A-IN-2 can be used for the research of alzheimer's disease, neuroblastoma.
  • HY-180552
    AChE-IN-104
    		Inhibitor
    AChE-IN-104 (compound 3e) is a potent acetylcholinesterase (AChE) inhibitor with an IC50 of 8.01 µM. AChE-IN-104 also inhibits BChE and MAO-A with IC50s of 65.41 µM and 1.51 µM, respectively. AChE-IN-104 can be used for Alzheimer’s disease (AD) research.
  • HY-114203
    Eckol
    		Inhibitor 98.95%
    Eckol is a potent hMAO-A (Mixed) and hMAO-B (non-competitive) inhibitor with IC50s of 7.20 and 83.44 μM, respectively. Eckol shows stimulatory effects in maize and can be used as a plant biostimulant. Eckol also shows antiallergic and antiviral effects.
  • HY-144757
    LSD1-IN-16
    		Inhibitor
    LSD1-IN-16 (compound 4b) is a potent LSD1 inhibitor. LSD1-IN-16 can inhibit LSD1-CoREST, MAO-A and MAO-B, with IC50 values of 0.015, 0.024, and 0.366 μM, respectively. LSD1-IN-16 displays cell growth arrest in prostate cancer LNCaP cells, with an IC50 of 15.2 μM.
  • HY-170938
    AChE-IN-82
    		Inhibitor
    AChE-IN-82 (compound 49) is an acetylcholinesterase (AChE) inhibitor. AChE-IN-82 inhibits eeAChE, eqBChE, hMAO-A, hMAO-B, and BACE-1 with IC50s of 0.072, 9.81, 14.52, 0.024, 2.42 μM, respectively. AChE-IN-82 inhibits COX-1, COX-2 and 5-LOX with IC50s of 60.41, 0.187, 0.18 μM, respectively. AChE-IN-82 shows an excellent neuroprotective effect by significantly reducing oxidative stress induced by H2 O2.
  • HY-182727
    MDL 72392
    		Inhibitor
    MDL 72392 is a selective irreversible monoamine oxidase A (MAO-A) inhibitor. MDL 72392 inhibits MAO-A. MDL 72392 is formed by decarboxylation of the bioprecursor amino acid MDL 72394 via aromatic L-amino acid decarboxylase. MDL 72392 can be used in melatonin biosynthesis research.
  • HY-D3221
    MAO Probe 1
    MAO Probe 1 is a reactive two-photon fluorescent probe capable of crossing the blood-brain barrier, which is used to detect the activity of monoamine oxidases (MAO-A/MAO-B), with Km values of 70 μM (MAO-A) and 75 μM (MAO-B), respectively. IBC 2 (benzo[g]imino-coumarin 2), the enzymatic product of MAO Probe 1, can further specifically bind to and image Aβ plaques, enabling in vivo two-photon co-monitoring of MAO activity and Aβ plaques. MAO Probe 1 can be used in Alzheimer's disease research (IBC 2: Ex/Em = 850 nm/570-620 nm).
  • HY-175523
    MAO-B-IN-48
    		Inhibitor
    MAO-B-IN-48 is a selective MAO-B inhibitor (IC50 = 0.09 μM, Ki = 0.02 μM). MAO-B-IN-48 exhibits inhibitory activity against hBChE (IC50 = 1.10 μM, Ki = 0.43 μM) and AChE (IC50 = 0.56 μM, Ki = 0.14 μM). MAO-B-IN-48 suppresses self-induced aggregation of toxic β-amyloid peptides and exerts antioxidant activity, including DPPH radical scavenging, CUPRAC copper ion reduction, and superoxide anion scavenging. MAO-B-IN-48 can be used for the study of Alzheimer's disease (AD).
  • HY-155577
    MAO A/HSP90-IN-1
    MAO A/HSP90-IN-1 (4-b) is a MAO A/HSP90 dual inhibitor with IC50 value of 1.77 μM and 0.019 μM in Glioblastoma (GBM) GL26 cells and HSP90α, respectively. MAO A/HSP90-IN-1 (4-b) can inhibit MAO A activity, HSP90 binding and the expression of HER2 and phospho-Akt to inhibit the growth of GBM, they also reduce PD-L1 expression, which inhibits T cell activation. MAO A/HSP90-IN-1 (4-b) have potential to inhibit tumor immune escape. MAO A/HSP90-IN-1 (4-b) can be used for brain tumor-related diseases research.
  • HY-W067583
    Norharmine
    		Inhibitor
    Norharmine is a Harmine analogue and an alkaloid. Norharmine is the inhibitors of MAO-A and DYRK1A. Norharmine has weak inhibitory activity against MAO-A and certain inhibitory activity against DYRK1A.
  • HY-105041
    Tedizolid phosphate sodium
    		Inhibitor
    Tedizolid phosphate (TR-701FA) sodium is a MAO-A and MAO-B inhibitor with activity against Gram-positive bacteria.
  • HY-105127
    Brofaromine hydrochloride
    		Inhibitor
    Brofaromine (hydrochloride) is a monoamine oxidase A (MAO-A) inhibitor and a 5-HT uptake inhibitor. Brofaromine (hydrochloride) shows antidepressant-like activity in the social conflict test in rats.
  • HY-N12134
    Methyl piperate
    		Inhibitor
    Methylpiperic acid is a piperine alkaloid with significant MAO inhibitory activity (IC503.6 μM). Methylpiperic acid is less effective against MAO-B (IC 501.6 μM) than MAO-A (IC5027.1 μM) has a bidirectional inhibitory effect. Methylphenidate is used to research mental disorders .
  • HY-N13041
    Acacetin 7-O-(6-O-malonylglucoside)
    		Inhibitor
    Acacetin 7-O-(6-O-malonylglucoside) is a monoamine oxidase inhibitor with strong inhibitory effects on monoamine oxidase A (MAO-A) and monoamine oxidase B (MAO-B) with IC50 values ​​of 2.34 and 1.87 μM, respectively. Acacetin 7-O-(6-O-malonylglucoside) is a reversible MAO inhibitor that can be used in the research of neurodegenerative diseases and affective disorders.
  • HY-W029600
    6,7-Dimethylisatin
    		Inhibitor
    6,7-Dimethylisatin (compound 1l), an Isatin (HY-Y0265) analogue, is a potent MAO inhibitor with IC50s of 20.3 μM and 6.74 μM for MAO-A and MAO-B, respectively. 6,7-Dimethylisatin has the potential for depression, Alzheimer's disease and Parkinson's disease research.