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• W2948830396 abstract "Objective: We describe and compare the local and systemic pharmacokinetics (PK) of tenofovir (TFV) and TFV-diphosphate (TFV-DP) in healthy premenopausal (PRE) and postmenopausal (POST) women using TFV 1% gel and correlate local PK with other mucosal end points. Methods: PRE (n = 20) and POST (n = 17) women used 2 doses of TFV 1% vaginal gel, separated by 2 hours. Blood and cervicovaginal samples were obtained 3 and 23 hours after the second dose. PRE women used gel in the follicular and luteal phases of the menstrual cycle. POST women used gel at baseline and again after approximately 2 months of treatment with 0.01% vaginal estradiol (E2) cream. Results: Median TFV concentrations in cervicovaginal aspirate (ng/mL) and vaginal tissue (ng/mg) were significantly higher in PRE (4.3E10 6 , 49.8) versus POST women (2.6E10 6 , 2.2). POST women had significantly higher median molecular ratios of TFV-DP to TFV (3.7%) compared with PRE (0.19%). After vaginal E2 treatment, the local and systemic PK end points in POST women were generally similar to PRE women (all P values > 0.05). Importantly, median vaginal tissue TFV-DP concentrations (fmol/mg) among PRE, POST, and POST women after E2 therapy were similar (292.5, 463.3, and 184.6, respectively). Vaginal tissue TFV concentrations were significantly positively correlated with vaginal epithelial thickness, whereas vaginal tissue TFV-DP concentrations were positively correlated with density of vaginal CD4 + and CD8 + immune cells. Conclusions: The state of the cervicovaginal mucosa has a significant impact on local and systemic PK of a topically applied microbicide." @default.
• W2948830396 created "2019-06-14" @default.
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• W2948830396 date "2018-05-01" @default.
• W2948830396 modified "2023-09-28" @default.
• W2948830396 title "Differences in Local and Systemic TFV PK Among Premenopausal Versus Postmenopausal Women Exposed to TFV 1% Vaginal Gel" @default.
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• W2948830396 doi "https://doi.org/10.1097/qai.0000000000001648" @default.
• W2948830396 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5902131" @default.
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