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Chitosan-Polyvinyl Pyrrolidone Hydrogel Does Not Activate Macrophages: Potentials for Transplantation Applications

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We have shown previously that chitosan-polyvinyl pyrrolidone (PVP) hydrogels are blood compatible, islet compatible, and noncytotoxic to various cell types. Because of these potential applications of chitosan-PVP hydrogel, the present study was designed to investigate its effect on macrophage activation. Macrophages did not adhere to hydrogel in culture but maintained their viability and did not undergo apoptosis as confirmed by trypan blue staining and absence of DNA ladder. Hydrogel leach-out products did not exhibit cytotoxic effects on macrophage functionality at mitochondrial and lysosomal level as confirmed by tetrazolium reduction (MTT) and neutral red uptake (NRU) assay. On exposure to hydrogels, macrophages showed comparable expression of activation markers such as CD11b/CD18 (Mac-1), CD45, and CD14 to those cultured in the presence of PTFE, a known biocompatible control, indicating its nonactivating nature. Macrophage activation was also assessed by checking the level of messenger RNA of inflammatory cytokines such as IL-6 and TNF-α by reverse transcriptase polymerase chain reaction (RT-PCR), which did not show stastistically significant difference (p > 0.05) in the expression of these transcripts in both control and hydrogel-exposed macrophages. The nonimmunogenic nature of the hydrogel was further confirmed by the lack of induced proliferation of mouse splenic lymphocytes after exposure to hydrogel leach-outs. All these results point out that chitosan-PVP hydrogel did not activate macrophages and thus is immunocompatible. Our results indicate that this hydrogel could be a potential candidate for transplantation studies by virtue of its biocompatibility and imunocompatibility.
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Keywords: Key words: Chitosan; Polyvinyl pyrrolidone (PVP);

Document Type: Research Article

Affiliations: Tissue Engineering and Banking Laboratory, National Centre for Cell Science, Ganeshkhind, Pune 411 007, India

Publication date: 2001-02-01

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  • Cell Transplantation publishes original, peer-reviewed research and review articles on the subject of cell transplantation and its application to human diseases. To ensure high-quality contributions from all areas of transplantation, separate section editors and editorial boards have been established. Articles deal with a wide range of topics including physiological, medical, preclinical, tissue engineering, and device-oriented aspects of transplantation of nervous system, endocrine, growth factor-secreting, bone marrow, epithelial, endothelial, and genetically engineered cells, among others. Basic clinical studies and immunological research papers are also featured. To provide complete coverage of this revolutionary field, Cell Transplantation will report on relevant technological advances, and ethical and regulatory considerations of cell transplants. Cell Transplantation is now an Open Access journal starting with volume 18 in 2009, and therefore there will be an inexpensive publication charge, which is dependent on the number of pages, in addition to the charge for color figures. This will allow work to be disseminated to a wider audience and also entitle the corresponding author to a free PDF, as well as prepublication of an unedited version of the manuscript.

    Cell Transplantation is now being published by SAGE. Please visit their website for the most recent issues.

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