Related Experiment Videos
Mouse erythrocyte carriers osmotically loaded with methotrexate
Abstract:
The mouse red blood cell (RBC) and red blood cell ghost (RBCG) have been studied as carriers of methotrexate (MTX). When incubated with high concentrations of MTX, RBCs take up significant quantities of it. However, when active loading techniques, such as the slow dialysis and preswell methods, are applied to those cells, up to 15 times more MTX can be entrapped. We have studied factors critical to the incorporation, leakage, and morphology of RBCGs during their loading with MTX by the slow dialysis and preswell methods. Compounds added to the buffers to maintain the ATP content of the cells and osmolarity play functional roles in this process. The fate of the material entrapped within the ghosts after in vivo administration was shown to be capture by the reticuloendothelial system. The pharmacological efficacy of MTX-loaded RBCGs in treating mice bearing hepatoma ascites tumors was demonstrated by increases in average survival time of 28.5-42.8%.
Insights
Red blood cells (RBCs) can be loaded with methotrexate (MTX) using advanced techniques. MTX-loaded RBC ghosts (RBCGs) show potential for treating hepatoma ascites tumors in mice, increasing survival rates.
Area of Science:
- Biomedical Engineering
- Drug Delivery Systems
- Oncology
Background:
- Red blood cells (RBCs) and their ghosts (RBCGs) are explored as potential carriers for chemotherapy drugs.
- Methotrexate (MTX) is an anticancer agent with challenges in targeted delivery and efficacy.
Purpose of the Study:
- To investigate the optimization of MTX loading into RBCGs using active loading techniques.
- To evaluate the stability, morphology, and in vivo efficacy of MTX-loaded RBCGs.
Main Methods:
- Utilized slow dialysis and preswell methods for active MTX loading into RBCGs.
- Investigated the impact of buffer compounds (ATP content, osmolarity) on MTX incorporation, leakage, and RBCG morphology.
- Assessed the in vivo fate of MTX-loaded RBCGs and their therapeutic effect in a murine hepatoma ascites tumor model.
Main Results:
- Active loading techniques increased MTX entrapment in RBCGs by up to 15-fold compared to simple incubation.
- Buffer composition critically influenced MTX incorporation, retention, and RBCG structural integrity.
- In vivo studies showed rapid clearance of MTX-loaded RBCGs by the reticuloendothelial system.
- MTX-loaded RBCGs significantly increased the average survival time of tumor-bearing mice by 28.5-42.8%.
Conclusions:
- Optimized loading methods enhance MTX encapsulation in RBCGs.
- RBCGs serve as effective carriers for MTX delivery, demonstrating significant therapeutic potential against hepatoma ascites tumors.
- Further research into RBCG-based drug delivery systems is warranted for cancer treatment.