Phenamil methanesulfonate

Catalog No. Size PriceQuantity
M13338-2 Contact for quotation $100
M13338-10 Contact for quotation $100


Phenamil methanesulfonate, an analog of Amiloride (HY-B0285), is a more potent and less reversible epithelial sodium channel (ENaC) blocker with an IC50 of 400 nM. Phenamil methanesulfonate is also a competive inhibitor of TRPP3 and inhibits TRPP3-mediated Ca2+ transport with an IC50 of 140 nM in a Ca2+ uptake assay. Phenamil methanesulfonate is an intriguing small molecule to promote bone repair by strongly activating BMP signaling pathway. Phenamil methanesulfonate is used for the research of cystic fibrosis lung disease.

Product information

CAS Number: 1161-94-0

Molecular Weight: 401.83

Formula: C13H16ClN7O4S

Chemical Name: 3,5-diamino-6-chloro-N-(N-phenylcarbamimidoyl)pyrazine-2-carboxamide; methanesulfonic acid

Smiles: CS(O)(=O)=O.NC1=NC(N)=C(Cl)N=C1C(=O)NC(=N)NC1C=CC=CC=1


InChi: InChI=1S/C12H12ClN7O.CH4O3S/c13-8-10(15)19-9(14)7(18-8)11(21)20-12(16)17-6-4-2-1-3-5-6;1-5(2,3)4/h1-5H,(H4,14,15,19)(H3,16,17,20,21);1H3,(H,2,3,4)

Technical Data

Appearance: Solid Power

Purity: ≥98% (or refer to the Certificate of Analysis)

Solubility: Soluble in DMSO

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical or refer to Certificate of Analysis

Storage Condition: Dry, dark and -20 oC for 1 year or refer to the Certificate of Analysis.

Shelf Life: ≥12 months if stored properly.

Stock Solution Storage: 0 - 4 oC for 1 month or refer to the Certificate of Analysis.

Drug Formulation: To be determined

HS Tariff Code: 382200

How to use

In Vitro:

TRPP3, a member of the transient receptor potential (TRP) superfamily of cation channels, is a Ca2+-activated channel permeable to Ca2+, Na+, and K+. TRPP3 is implicated in regulation of pH-sensitive action potential in spinal cord neurons. Phenamil methanesulfonate (1 μM) decreases 45Ca2+ uptake in a radiotracer uptake assay. It inhibits TRPP3-mediated Ca2+ transport with an IC50 value of 0.28 μM in oocytes expressing TRPP3 or H2O-injected oocytes. Phenamil methanesulfonate is a more potent ENaC blocker than Amiloride, it inhibits the epithelial sodium channel (ENaC) with an IC50 of 400 nM (Amiloride=776 nM). Phenamil methanesulfonate inhibits basal short-circuit currents with IC50 values of 75 and 116 nM, respectively in both human and ovine bronchial epithelia cells. Phenamil methanesulfonate (0-20 μM; 14 days) elevates adipogenic gene expression, PPARγ, Fabp4, and lipoprotein lipase expression in a concentration-dependent manner ,and regulates adipogenesis in C3H10T1/2 cells. Phenamil methanesulfonate (0-20 μM; 7 or 14 days) modulates MC3T3-E1 osteoblastic differentiation, it increases Alkaline phosphatase (ALP) activity in MC3T3-E1 cells in a concentration-dependent manner.

In Vivo:

Phenamil methanesulfonate (subcutaneous injection; 15 or 30 mg/kg; 21 days; infusion rate of 1 ml/h) reduces chronic-hypoxia-induced pulmonary artery hypertension (PAH). Additionally, the mRNA level of SMA, SM22, Id3, and Trb3 from the lung sample are also decreased by Phenamil under hypoxia or normoxia in rats. However, phenamil has little effect on pulmonary vasculature under physiological conditions.


  1. Xiao-Qing Dai , et al. Inhibition of TRPP3 channel by amiloride and analogs. Mol Pharmacol. . 2007 Dec;72(6):1576-85.
  2. Andrew J Hirsh, et al.Design, synthesis, and structure-activity relationships of novel 2-substituted pyrazinoylguanidine epithelial sodium channel blockers: drugs for cystic fibrosis and chronic bronchitis. J Med Chem. 2006 Jul 13;49(14):4098-115.
  3. Andrew J Hirsh, et al.Evaluation of second generation amiloride analogs as therapy for cystic fibrosis lung disease.J Pharmacol Exp Ther. 2004 Dec;311(3):929-38.

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