1,3-PBIT (dihydrobromide)

- Overview
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    Background
    
    1,3-PBIT (dihydrobromide) is a potent and selective iNOS inhibitor with Ki value of 47 nM [1]. Nitric oxide (NO) is an endogenously produced inorganic free radical gas which has been implicated in blood pressure homeostasis, platelet aggregation, neurotransmission, and immunological defense mechanisms. NO is synthesized by three isoforms of nitric oxide synthase (NOS): nNOS, eNOS and iNOS [1]. 1,3-PBIT, also known as S,S’-(1,3-Phenylenebis(1,2-ethanediyl))bisisothiourea, is a potent and selective iNOS inhibitor. 1,3-PBIT inhibited purified human iNOS, eNOS and nNOS with Ki values of 47 nM, 9 μM and 0.25 μM, respectively. 1,3-PBIT exhibited 190-fold selective against iNOS versus eNOS. In DLD-1 cells, 1,3-PBIT inhibited human iNOS with IC50 value of 150 μM, presumably to poor membrane permeability [1]. In conscious male Sprague-Dawley rats, 1,3-PBIT (10mg/kg, ip; 1 h after endotoxin) inhibited endotoxin-induced decrease in MAP, renal CYP 4A1/A3 protein level and CYP 4A activity and increase in systemic and renal nitrite production [2].
    
    [1]. Garvey EP, Oplinger JA, Tanoury GJ, et al. Potent and selective inhibition of human nitric oxide synthases. Inhibition by non-amino acid isothioureas. J Biol Chem. 1994 Oct 28;269(43):26669-76.
    [2]. Tunctan B, Yaghini FA, Estes A, et al. Inhibition by nitric oxide of cytochrome P450 4A activity contributes to endotoxin-induced hypotension in rats. Nitric Oxide. 2006 Feb;14(1):51-7.
- Properties
  - Alternative Name
    
    S,S'-1,3-phenylene-bis(1,2-ethanediyl)bis-isothiourea, dihydrobromide
    
    CAS Number
    
    200716-66-1
    
    Molecular Formula
    
    C12H18N4S2·2HBr
    
    Molecular Weight
    
    444.2
    
    Appearance
    
    A crystalline solid
    
    Purity
    
    98.00%
    
    Solubility
    
    ≤100mg/ml in H2O
    
    Storage
    
    Store at -20°C
    
    * For Research Use Only

1,3-PBIT (dihydrobromide)

Background

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