Abstract
Study objective was to assess skin-to-skin drug transfer potential that may occur due to drug retention in human epidermis (DRE) pretreated with application of estradiol transdermal drug delivery systems (TDDS) and other estradiol transdermal dosage forms (gels and sprays). TDDS (products-A, B, and C) with varying formulation design and composition, and other estradiol transdermal products (gel and spray) were applied to heat separated human epidermis (HSE) and subjected to in vitro drug permeation study. Amounts of DRE were quantified after 24 h. The DRE with product-B was significantly (P < 0.001) higher than that with product-C, product-A, gel, and spray. However, products-A and C, gel, and spray showed almost the same (P > 0.05) amounts of DRE. A separate in vitro permeation study was carried out to determine amounts of drug transferred from drug-retaining epidermis to untreated HSE. The amounts of drug transferred, due to DRE after 8 h, with product-C were significantly (P < 0.001) higher than those with products-A and B, gel, and spray. The in vitro study results indicate a high potential of skin-to-skin drug transfer due to the DRE after labeled period of using estradiol TDDS, though the clinical relevance of these findings is yet to be determined.
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Abbreviations
- ANOVA:
-
Analysis of variance
- DRE:
-
Drug retention in human epidermis
- CDER:
-
Center for Drug Evaluation and Research
- CHTN:
-
Cooperative Human Tissue Network
- DIA:
-
Drug-in-adhesive
- HSE:
-
Heat separated human epidermis
- HT:
-
Hormone therapy
- Kp:
-
Permeability coefficient
- NDRI:
-
National Disease Research Interchange
- PSA:
-
Pressure-sensitive adhesive
- Q24 :
-
Drug permeated at the end of 24 h
- SC:
-
Stratum corneum
- TDDS:
-
Transdermal drug delivery systems
- TEWL:
-
Transepidermal water loss
- VVA:
-
Vulvovaginal atrophy
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ACKNOWLEDGEMENTS
This work was supported by the FDA Office of Women’s Health. This project was supported in part by an appointment to the ORISE Research Participation Program at the Center for Drug Evaluation and Research (CDER), US Food and Drug Administration, administered by the Oak Ridge Institute for Science and Education through an interagency agreement between the US Department of Energy and FDA/CDER. The authors acknowledge the help of Robert Hunt (CDER/OPQ/OTR/DPQR) in conducting some of the experiments. Surgically discarded human skin samples were provided by Cooperative Human Tissue Network which is funded by National Cancer Institute (other investigators may have received the specimens from the same subjects).
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Krishnaiah, Y.S.R., Pavurala, N., Yang, Y. et al. In Vitro Drug Transfer Due to Drug Retention in Human Epidermis Pretreated with Application of Marketed Estradiol Transdermal Systems. AAPS PharmSciTech 18, 2131–2140 (2017). https://doi.org/10.1208/s12249-016-0694-9
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DOI: https://doi.org/10.1208/s12249-016-0694-9