Related Experiment Videos
Mitomycin C carrying microspheres as a novel method of drug delivery
Abstract:
Biodegradable albumin microspheres containing about 5% mitomycin C (MMC) were prepared in an average diameter of 45 +/- 8 microns by heat denaturation in oil at 120 degrees C and/or cross-linking with glutaraldehyde. These MMC microspheres released, in vitro, about 20% of the contained MMC for over 3 days, and they were intra-arterially infused into albino rabbits and Wistar rats, as a preclinical model of intra-arterial infusion treatment for patients with inoperable hepatic tumor. We infused these microspheres into the femoral artery of rabbits with a VX-2 tumor implanted into the flank of the hindleg. High levels of MMC were maintained for several hours in the tumor and the entrapped MMC microspheres were detected within arterioles in the VX-2 tumors. The growth of VX-2 tumor was inhibited considerably, compared to findings in the control rabbits given conventional MMC. In the next studies, MMC microspheres were infused into the rat hepatic artery, and the levels of MMC in the hepatic vein blood were maintained at much the same concentration for over 2 hours after the infusion, in marked contrast to rapid decreases in the conventional MMC. Histologic findings revealed that MMC micro-spheres were entrapped within the hepatic arterioles for over 2 weeks and released biologically active MMC into the neighboring tissues for prolonged periods of time.
Insights
Biodegradable albumin microspheres loaded with mitomycin C (MMC) effectively inhibit tumor growth. These microspheres provide sustained drug release, offering a promising approach for hepatic tumor treatment.
Area of Science:
- Biomaterials Science
- Oncology
- Pharmacology
Background:
- Biodegradable albumin microspheres offer potential for targeted drug delivery.
- Mitomycin C (MMC) is a chemotherapeutic agent used in cancer treatment.
- Intra-arterial infusion is a method for delivering drugs directly to tumors.
Purpose of the Study:
- To prepare and characterize biodegradable albumin microspheres containing mitomycin C (MMC).
- To evaluate the in vitro release profile of MMC from the microspheres.
- To assess the efficacy of intra-arterial infusion of MMC microspheres in preclinical models of hepatic and limb tumors.
Main Methods:
- Biodegradable albumin microspheres (45 ± 8 microns) loaded with 5% MMC were prepared via heat denaturation and/or glutaraldehyde cross-linking.
- In vitro release studies were conducted over 3 days.
- Intra-arterial infusion of MMC microspheres was performed in rabbits with VX-2 hindleg tumors and in rats with hepatic tumors.
Main Results:
- In vitro studies showed sustained release of approximately 20% MMC over 3 days.
- In rabbits, MMC microspheres achieved high MMC levels in tumors for hours, inhibiting VX-2 tumor growth compared to conventional MMC.
- In rats, hepatic artery infusion maintained MMC levels for over 2 hours, with microspheres entrapped in arterioles for over 2 weeks, releasing active MMC.
Conclusions:
- Biodegradable albumin microspheres are effective carriers for sustained intra-arterial delivery of mitomycin C.
- This drug delivery system demonstrates significant tumor growth inhibition in preclinical models.
- MMC-loaded albumin microspheres represent a promising strategy for treating inoperable hepatic tumors.