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Research ArticleArticle

Ocular Disposition of Ganciclovir and Its Monoester Prodrugs following Intravitreal Administration Using Microdialysis

Sreeraj Macha and Ashim K. Mitra
Drug Metabolism and Disposition June 2002, 30 (6) 670-675; DOI: https://doi.org/10.1124/dmd.30.6.670
Sreeraj Macha
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Ashim K. Mitra
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Abstract

The present study was carried out to delineate the ocular pharmacokinetics of ganciclovir (GCV) following intravitreal administration. Another objective was to achieve sustained therapeutic concentrations of GCV in the vitreous over a prolonged period of time using its acyl monoester prodrugs (acetate, propionate, butyrate, and valerate). New Zealand albino male rabbits (2–2.5 kg) were kept under anesthesia. A concentric microdialysis probe was implanted in the vitreous using a 21-guage needle, and a linear microdialysis probe was implanted in the anterior chamber across the cornea using a 25-guage needle. The probes were perfused with isotonic phosphate buffer saline (pH 7.4) at a flow rate of 2 μl/min. The drugs were administered (0.2 μmoles) intravitreally and the samples were collected every 20 min over a period of 10 h. The vitreal terminal elimination half-life (t1/2β) of GCV was found to be 426 ± 109 min. The hydrolysis rate and vitreal clearance of the prodrugs increased with the ascending ester chain length. The vitreal elimination half-lives (t1/2k10) of GCV, acetate, propionate, butyrate, and valerate esters of GCV were 170 ± 37, 117 ± 50, 122 ± 13, 55 ± 26, and 107 ± 14 min, respectively. A parabolic relationship was observed between the vitreal elimination rate constant and the ester chain length. Mean residence time (MRT) of the regenerated GCV following prodrug administration was found to be three to four times the value obtained after GCV injection. In conclusion, these studies have shown that the ester prodrugs generated therapeutic concentrations of GCV in vivo, and the MRT of GCV could be enhanced by 3- to 4-fold through prodrug modification.

Footnotes

  • Supported by National Eye Institute Grants 2R01 EY 09171-06 and 2R01 EY 10659-05.

  • Abbreviations used are::
    HCMV
    human cytomegalovirus
    AIDS
    acquired immunodeficiency syndrome
    GCV
    ganciclovir
    GCVMA
    monoacetate
    GCVMP
    monopropionate
    GCVMB
    monobutyrate
    GCVMV
    monovalerate
    AUC
    area under the curve
    MRT
    mean residence time
    • Received August 10, 2001.
    • Accepted February 25, 2002.
  • The American Society for Pharmacology and Experimental Therapeutics
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Drug Metabolism and Disposition: 30 (6)
Drug Metabolism and Disposition
Vol. 30, Issue 6
1 Jun 2002
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Research ArticleArticle

Ocular Disposition of Ganciclovir and Its Monoester Prodrugs following Intravitreal Administration Using Microdialysis

Sreeraj Macha and Ashim K. Mitra
Drug Metabolism and Disposition June 1, 2002, 30 (6) 670-675; DOI: https://doi.org/10.1124/dmd.30.6.670

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Research ArticleArticle

Ocular Disposition of Ganciclovir and Its Monoester Prodrugs following Intravitreal Administration Using Microdialysis

Sreeraj Macha and Ashim K. Mitra
Drug Metabolism and Disposition June 1, 2002, 30 (6) 670-675; DOI: https://doi.org/10.1124/dmd.30.6.670
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