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Intraprostatic chemotherapy: distribution and transport mechanisms
M Guillaume Wientjes1, Jenny H Zheng, Leijun Hu
1College of Pharmacy and James Cancer Hospital and Solove Research Institute, The Ohio State University, Columbus, Ohio 43210, USA. wientjes.1@osu.edu
Summary
Intraprostatic chemotherapy offers a viable method for delivering high drug concentrations directly to the prostate. This approach shows a significant targeting advantage over intravenous administration, improving localized drug delivery.
Area of Science:
- Pharmacology
- Urology
- Drug Delivery Systems
Background:
- Prostate cancer treatment often requires effective drug delivery to tumor sites.
- Achieving high localized drug concentrations within the prostate is a therapeutic challenge.
Purpose of the Study:
- To evaluate the tissue distribution and targeting efficacy of intraprostatic chemotherapy.
- To compare drug distribution patterns between intraprostatic and intravenous administration routes.
Main Methods:
- Studied the delivery and spatial distribution of doxorubicin in beagle dog prostates.
- Administered doxorubicin via intraprostatic injection and intravenous (i.v.) injection.
- Measured drug concentrations using high-performance liquid chromatography and confocal fluorescence microscopy.
Main Results:
- Intraprostatic injection resulted in highly heterogeneous doxorubicin distribution, concentrating in specific glandular lobules.
- Intravenous administration led to a more homogeneous distribution throughout the prostate.
- Intraprostatic administration achieved approximately 100-fold higher tissue-to-plasma drug concentration ratios compared to i.v. injection.
Conclusions:
- Intraprostatic administration is a promising strategy for achieving high drug concentrations within the prostate.
- Fibromuscular stroma acts as a barrier to drug transport, influencing distribution patterns.
- Acinar flow plays a crucial role in the convective transport of drugs within the prostate.