Darunavir concentration in PBMCs may be a better indicator of drug exposure in HIV patients

Daisuke Nagano, Takuya Araki, Kunio Yanagisawa, Yoshiyuki Ogawa, Fumito Gohda, Hideki Uchiumi, Hiroshi Handa, Tomonori Nakamura, Koujirou Yamamoto

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Purpose: The clinical efficacies of some antiretroviral drugs are known to not depend on its concentration in blood. To establish a method of dosage adjustment for darunavir (DRV) based on pharmacokinetic theory, we analyzed the correlation between DRV levels in peripheral blood mononuclear cells (PBMCs) and plasma. Methods: The concentrations of DRV and ritonavir (RTV) in plasma and PBMCs of 31 samples obtained from 19 patients were analyzed. An in vitro kinetic study using MOLT-4 cells was performed to assess the contribution of RTV to the intracellular accumulation of DRV. Results: DRV levels in PBMCs varied between 7.91 and 29.36 ng/106 cells (CV 37.5%), while those in plasma were greater. No significant correlation was found between the trough level of DRV in plasma and that in PBMCs (p = 0.575). The inter-day difference in DRV levels in PBMCs seemed smaller than that in plasma (− 41.6–23.0% vs − 83.3–109.1%). In the in vitro study, the elimination half-life of cellular efflux of DRV was 15.7 h in the absence of RTV and extended to 47.6 h in the presence of RTV. Conclusions: We found a poor correlation between intracellular DRV and plasma DRV levels in patients receiving highly active antiretroviral therapy. The efflux rate of DRV from cells was slow; therefore, the concentration of DRV in PBMCs may reflect average exposure to the drug and clinical efficacy.

Original languageEnglish
Pages (from-to)1055-1060
Number of pages6
JournalEuropean Journal of Clinical Pharmacology
Issue number8
Publication statusPublished - 2018 Aug 1
Externally publishedYes


  • Darunavir
  • Efflux
  • Intracellular
  • PBMC
  • Ritonavir

ASJC Scopus subject areas

  • Pharmacology
  • Pharmacology (medical)


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