Kaur I, Kosak KM, Terrazas M, Herron JN, Kern SE, Boucher KM, Shami PJ. Effect of a Pluronic(®) P123 formulation on the nitric oxide-generating drug JS-K.
Pharm Res 2014;
32:1395-406. [PMID:
25330743 DOI:
10.1007/s11095-014-1542-9]
[Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2014] [Accepted: 10/02/2014] [Indexed: 10/24/2022]
Abstract
PURPOSE
O(2)-(2,4-dinitrophenyl)1-[(4-ethoxycarbonyl)piperazin-1-yl]diazen-1-ium-1,2-diolate] or JS-K is a nitric oxide-producing prodrug of the arylated diazeniumdiolate class with promising anti-tumor activity. JS-K has challenging solubility and stability properties. We aimed to characterize and compare Pluronic(®) P123-formulated JS-K (P123/JS-K) with free JS-K.
METHODS
We determined micelle size, shape, and critical micelle concentration of Pluronic(®) P123. Efficacy was evaluated in vitro using HL-60 and U937 cells and in vivo in a xenograft in NOD/SCID IL2Rγ (null) mice using HL-60 cells. We compared JS-K and P123/JS-K stability in different media. We also compared plasma protein binding of JS-K and P123/JS-K. We determined the binding and Stern Volmer constants, and thermodynamic parameters.
RESULTS
Spherical P123/JS-K micelles were smaller than blank P123. P123/JS-K formulation was more stable in buffered saline, whole blood, plasma and RPMI media as compared to free JS-K. P123 affected the protein binding properties of JS-K. In vitro it was as efficacious as JS-K alone when tested in HL-60 and U937 cells and in vivo greater tumor regression was observed for P123/JS-K treated NOD/SCID IL2Rγ (null) mice when compared to free JS-K-treated NOD/SCID IL2Rγ (null) mice.
CONCLUSIONS
Pluronic(®) P123 solubilizes, stabilizes and affects the protein binding characteristics of JS-K. P123/JS-K showed more in vivo anti-tumor activity than free JS-K.
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