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Harmane is an inhibitor that binds to benzodiazepine receptors (with an IC50 value of 7 μM), has an IC50 of 24 μM for muscarinic acetylcholine receptors (QNB), an IC50 of 2.8 μM for opioid receptors, and IC50 values of 163 and 101 μM for spironolactone and serotonin, respectively. Harmane is a selective monoamine oxidase inhibitor (with IC50 values of 0.5 μM for MAO A and 5 μM for MAO B). Harman inhibits dopamine biosynthesis by decreasing tyrosine hydroxylase (TH) activity and enhancing levodopa (L-DOPA)-induced toxicity in PC12 cells. Harmane lowers blood pressure in rats through the I1 imidazoline receptor (I1 receptor) and has antidepressant, anxiolytic, anticonvulsant, and analgesic effects. Harmane enhances the mutagenicity induced by 2-acetylaminofluorene (AAF) .
For research use only. We do not sell to patients.
Harmane is an inhibitor that binds to benzodiazepine receptors (with an IC50 value of 7 μM), has an IC50 of 24 μM for muscarinic acetylcholine receptors (QNB), an IC50 of 2.8 μM for opioid receptors, and IC50 values of 163 and 101 μM for spironolactone and serotonin, respectively. Harmane is a selective monoamine oxidase inhibitor (with IC50 values of 0.5 μM for MAO A and 5 μM for MAO B). Harman inhibits dopamine biosynthesis by decreasing tyrosine hydroxylase (TH) activity and enhancing levodopa (L-DOPA)-induced toxicity in PC12 cells. Harmane lowers blood pressure in rats through the I1 imidazoline receptor (I1 receptor) and has antidepressant, anxiolytic, anticonvulsant, and analgesic effects. Harmane enhances the mutagenicity induced by 2-acetylaminofluorene (AAF) [1][2][3][4][5][6].
The IC50 of Harmane for benzodiazepine receptor flunitrazepam is 7 μM, the IC50 for the opioid receptor is 2.8 μM, and in the presence of 50 mM sodium ions, the IC50 for the opioid receptor is 42 μM, and the IC50 for spiropyrinol and serotonin is 163, 101 μM[1].
The IC50 of Harmane for I1 imidazoline receptor is 30 nM), and the IC50 for α2-adrenergic receptor is 18 μM[2].
Harmane (1 μM) increases the mutagenicity of AAF to Salmonella typhimurium TA98 by three times in the presence of an S-9 mixture (containing 4 μM NADH and NADPH per ml but no NADP); in the absence of S-9, it increases the mutagenicity of N-acetyloxy AAF by 2.5 times[4].
Harmane (5-25 μM, 0-72 h) reduced the dopamine content in PC12 cells (IC50 is 21.2 μM) in a concentration-dependent manner and could reduce the dopamine content induces by L-DOPA[6].
Harmane (20 μM, 0-72 h) inhibits the activity of tyrosine hydroxylase (TH) in PC12 cells at 24 h and restores it to normal levels at 72 h; it inhibits the expression of TH mRNA at 6 h and restores it at 48 h[6].
Harmane (20μM, 30min) reduces the intracellular cyclic AMP level and intracellular calcium ion concentration in PC12 cells[6].
Harmane (80-150μM, 24-48h) exhibits cytotoxicity and induces cell death[6].
MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.
Showed cytotoxicity, and cell apoptosis was observed after 48 h of treatment with 150 μM. Concentrations higher than 150 μM could induce apoptotic cell death.
Had stronger cell viability than L-DOPA alone.
Inhibited the increase in dopamine content induced by L-DOPA.
Reduced dopamine content, tyrosine hydroxylase activity and mRNA at 6 h, which was maintained for 48 h and gradually recovered at 72 h.
In Vivo
Harman (0-12.5mg/kg, i.v., single dose) has an ED50 of 3.6 mg/kg for convulsant activity in rats. Its anticonvulsant effect lasts for a short time and delays the reaction time to pain[1].
Harman (0.01-1 nM, injected into rostralventrolateral medulla, single dose) caused a decrease in blood pressure in rats[2].
Harman (2.5-10 mg/kg, i.p., single dose) had anxiolytic and antidepressant effects in rats[5].
MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.
0, 3.125, 6.25 mg/kg, single dose; 0, 1.56, 3.125, 6
25, 12.5 mg/kg, single dose; 0, 1.56, 3.125, 6.25 mg/kg, single dose
Administration:
Intravenous injection (i.v.)
Result:
Delayed apamorphine-induced licking.
Increased body temperature in rats, reaching the highest value in 25 minutes. 3.125 mg/kg or above caused hypothermia in a dose-dependent manner. Body temperature returned to the control level 100 minutes after injection of 3.125 or 6.25 mg/kg.
Prolonged the reaction time to nociception. At 3.125 mg/kg, a delay in reaction could be detected in 20 minutes.
Injection into RVLM (rostralventrolateral medulla)
Result:
Caused a dose-dependent decrease in mean arterial pressure (MAP) without significant changes in heart rate (HR). Phaloxan could reverse the decrease in MAP.
Room temperature in continental US; may vary elsewhere.
Storage
Powder
-20°C
3 years
4°C
2 years
In solvent
-80°C
6 months
-20°C
1 month
Solvent & Solubility
In Vitro:
DMSO : 100 mg/mL (548.79 mM; Need ultrasonic; Hygroscopic DMSO has a significant impact on the solubility of product, please use newly opened DMSO)
H2O : < 0.1 mg/mL (insoluble)
Preparing Stock Solutions
ConcentrationSolventMass
1 mg
5 mg
10 mg
1 mM
5.4879 mL
27.4394 mL
54.8787 mL
5 mM
1.0976 mL
5.4879 mL
10.9757 mL
10 mM
0.5488 mL
2.7439 mL
5.4879 mL
View the Complete Stock Solution Preparation Table
*Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles. Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month. When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.
For the following dissolution methods, please ensure to first prepare a clear stock solution using an In Vitro approach and then sequentially add co-solvents:
To ensure reliable experimental results, the clarified stock solution can be appropriately stored based on storage conditions. As for the working solution for in vivo experiments, it is recommended to prepare freshly and use it on the same day. The percentages shown for the solvents indicate their volumetric ratio in the final prepared solution. If precipitation or phase separation occurs during preparation, heat and/or sonication can be used to aid dissolution.
This protocol yields a clear solution of ≥ 2.5 mg/mL (saturation unknown).
Taking 1 mL working solution as an example, add 100 μLDMSO stock solution (25.0 mg/mL) to 400 μL PEG300, and mix evenly; then add 50 μL Tween-80 and mix evenly; then add 450 μL Saline to adjust the volume to 1 mL.
Preparation of Saline: Dissolve 0.9 g sodium chloride in ddH₂O and dilute to 100 mL to obtain a clear Saline solution.
Protocol 2
Add each solvent one by one: 10% DMSO 90% (20% SBE-β-CD in Saline)
This protocol yields a clear solution of ≥ 2.5 mg/mL (saturation unknown). If the continuous dosing period exceeds half a month, please choose this protocol carefully.
Taking 1 mL working solution as an example, add 100 μLDMSO stock solution (25.0 mg/mL) to 900 μLCorn oil, and mix evenly.
In Vivo Dissolution Calculator
Please enter the basic information of animal experiments:
Dosage
mg/kg
Animal weight (per animal)
g
Dosing volume (per animal)
μL
Number of animals
Recommended: Prepare an additional quantity of animals to account for potential losses during experiments.
Please enter your animal formula composition:
%
DMSO+
%
+
%
Tween-80
+
%
Saline
Recommended: Keep the proportion of DMSO in working solution below 2% if your animal is weak.
The co-solvents required include: DMSO,
. All of co-solvents are available by MedChemExpress (MCE).
, Tween 80. All of co-solvents are available by MedChemExpress (MCE).
Calculation results:
Working solution concentration:
mg/mL
Method for preparing stock solution:
mg
drug dissolved in
μL
DMSO (Stock solution concentration: mg/mL).
The concentration of the stock solution you require exceeds the measured solubility. The following solution is for reference only. If necessary, please contact MedChemExpress (MCE).
Method for preparing in vivo working solution for animal experiments: Take
μL DMSO stock solution, add
μL .
μL , mix evenly, next add
μL Tween 80, mix evenly, then add
μL Saline.
Dissolve 0.9 g sodium chloride in ddH₂O and dilute to 100 mL to obtain a clear Saline solution
If the continuous dosing period exceeds half a month, please choose this protocol carefully.
Please ensure that the stock solution in the first step is dissolved to a clear state, and add co-solvents in sequence. You can use ultrasonic heating (ultrasonic cleaner, recommended frequency 20-40 kHz), vortexing, etc. to assist dissolution.
*Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles. Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month. When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.
Species cross-reactivity must be investigated individually for each product. Many human cytokines will produce a nice response in mouse cell lines, and many mouse proteins will show activity on human cells. Other proteins may have a lower specific activity when used in the opposite species.
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