Pharmacodynamics of RWJ-54428 against Staphylococcus aureus, Streptococcus pneumoniae, and Enterococcus faecalis in a Neutropenic Mouse Thigh Infection Model.

Pharmacodynamics of RWJ-54428 against Staphylococcus aureus, Streptococcus pneumoniae, and Enterococcus faecalis in a Neutropenic Mouse Thigh Infection Model. Research Abstract Details 

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Pharmacodynamics of RWJ-54428 against Staphylococcus aureus, Streptococcus pneumoniae, and Enterococcus faecalis in a Neutropenic Mouse Thigh Infection Model. Abstract Text:

David C Griffith,David Rodriguez,Erik Corcoran,Michael N Dudley,

RWJ-54428 (also known as MC-02,479) is a new cephalosporin with promising activity against gram-positive bacteria. The pharmacodynamics (PDs) of RWJ-54428 against Staphylococcus aureus, Streptococcus pneumoniae, and Enterococcus faecalis were studied in a neutropenic mouse thigh infection model. The RWJ-54428 MICs ranged from 0.25 to 1 mg/liter. Mice with ca. 10(6) CFU/thigh at the initiation of therapy were treated intraperitoneally with RWJ-54428 at doses that ranged from 3 to 1,200 mg/kg of body weight/day (in 2, 3, 4, 6, or 12 divided doses) for 24 h. The maximal reductions in bacterial counts in thigh tissues at 24 h for the methicillin-resistant S. aureus, penicillin-resistant S. pneumoniae, and E. faecalis strains were -2.8, -3.8, and -1.7 log(10) CFU/thigh, respectively. The percentage of a 24-h dosing interval that the unbound serum RWJ-54428 concentrations exceeded the MIC (fT(>)(MIC)) was the pharmacokinetic (PK)-PD parameter that best described the efficacy of RWJ-54428. The fT(>)(MIC)s for a bacteriostatic effect (no net change in the numbers of CFU/thigh over 24 h) ranged from 14 to 20% for staphylococci and streptococci; for maximal reductions in the numbers of CFU/thigh, the fT(>)(MIC)s ranged from 22 to 36% for these strains. For E. faecalis, the ranges of fT(>)(MIC)s for static and maximal effects were 30 to 46% and 55 to 60%, respectively. These data show that treatment with RWJ-54428 results in marked antibacterial effects in vivo, with the PK-PD parameters for efficacy being comparable to those for the efficacy of penicillins and carbapenems active against staphylococci and pneumococci.

Pharmacodynamics of RWJ-54428 against Staphylococcus aureus, Streptococcus pneumoniae, and Enterococcus faecalis in a Neutropenic Mouse Thigh Infection Model. Publishing Authors By Initials

DC Griffith,D Rodriguez,E Corcoran,MN Dudley,

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Pharmacodynamics of RWJ-54428 against Staphylococcus aureus, Streptococcus pneumoniae, and Enterococcus faecalis in a Neutropenic Mouse Thigh Infection Model. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Antimicrobial agents and chemotherapy

VOLUME: 52

Page Numbers: 244-7

Journal Abbreviation: Antimicrob. Agents Chemother.

ISSN: 0066-4804

DAY: 22

MONTH: 10

YEAR: 2007

Pharmacodynamics of RWJ-54428 against Staphylococcus aureus, Streptococcus pneumoniae, and Enterococcus faecalis in a Neutropenic Mouse Thigh Infection Model. Information

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LANGUAGE: eng

NlmUniqueID: 315061

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AFFILIATION: Mpex Pharmaceuticals, Inc. 3030 Bunker Hill St., Suite 200, San Diego, CA 92109. dgriffith@mpexpharma.com.

Country: United States

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MEDLINETA: Antimicrob Agents Chemother

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