Procion Blue HB (Reactive Blue 2) is a purinergic antagonist.

Reactive Blue 2 is used as an ATP receptor antagonist and induces Ca²⁺ oscillations in HeLa cells. Reactive Blue 2 enhances a Ca²⁺ response to histamine that is linked to the PLC cascade. Reactive Blue 2 may activate the PLC cascade in an extracellular Ca²⁺-dependent manner and induce Ca²⁺ oscillations^[1]. The application of Reactive Blue 2 increases K⁺ secretion in a dose-dependent manner, and this increase is characterized as a peak followed by a partial relaxation to a steady-state. Reactive Blue 2 has antagonistic activities at P2Y4, and the antagonist potency at P2Y4 paralleled the potency of K+ secretion^[2].The anthraquinone dye reactive blue 2 is found to be a potent inhibitor of a protein kinase isolated and purified from thylakoids. The mode of inhibition is noncompetitive, with a K_i of 8 μM for the membrane-bound kinase, and 6 microM for the purified kinase. The inhibitor does not modify the substrate preference of the endogenous kinase and could be removed from the membrane by washing^[3]. Reactive blue 2 selectively inhibits responses mediated via the P2ypurinoceptor, at least within a limited concentration range. In preparations where the tone has been raised with noradrenaline, ATP and 2-methylthio ATP, but not α,β-methylene ATP, produce relaxations of the vessel. These relaxations are inhibited in the presence of reactive blue 2^[4]. Reactive blue 2, at concentrations of 0.3-10 μM blocks the ATP-induced oscillation in a concentration-dependent manner^[5].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

774.16

C₅₈H₄₀Cl₂N₁₄O₂₂S₆

12236-82-7

蓝色染料；普施安蓝 HB；活性蓝 2；汽巴蓝 F3GA

Room temperature in continental US; may vary elsewhere.

4deg;C, protect from light

*In solvent : -80deg;C, 6 months; -20deg;C, 1 month (protect from light)

DMSO : ≥ 110 mg/mL (142.09 mM)

H₂O : 10 mg/mL (12.92 mM; Need ultrasonic)

Ethanol : < 1 mg/mL (insoluble)

* “≥” means soluble, but saturation unknown.

请根据产品在不同溶剂中的溶解度选择合适的溶剂配制储备液；一旦配成溶液，请分装保存，避免反复冻融造成的产品失效。
储备液的保存方式和期限：-80°C, 6 months; -20°C, 1 month (protect from light)。-80°C 储存时，请在 6 个月内使用，-20°C 储存时，请在 1 个月内使用。

• [1]. Okuda A, et al. Reactive blue 2 induces calcium oscillations in HeLa cells. Jpn J Physiol. 2001 Jun;51(3):389-93.

  [2]. Lee JH, et al. Reactive blue 2, an antagonist of rat P2Y4, increases K+ secretion in rat cochlea strial marginal cells. Hear Res. 2006 Sep;219(1-2):66-73.

  [3]. Coughlan SJ, et al. Reactive blue 2 is a potent inhibitor of a thylakoid protein kinase. Eur J Biochem. 1991 Apr 23;197(2):467-71.

  [4]. Burnstock G, et al. P2-purinoceptors of two subtypes in the rabbit mesenteric artery: reactive blue 2 selectively inhibits responses mediated via the P2y-but not the P2x-purinoceptor. Br J Pharmacol. 1987 Feb;90(2):383-91.

  [5]. Uneyama H, et al. Suramin and reactive blue 2 are antagonists for a newly identified purinoceptor on rat megakaryocyte. Br J Pharmacol. 1994 Jan;111(1):245-9.