Intercellular accumulation of type V collagen fibrils in accordance with cell aggregation |
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Authors: | Kihara Takanori Imamura Yasutada Takemura Yukitoshi Mizuno Kazunori Adachi Eijiro Hayashi Toshihiko |
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Affiliation: | Department of Bioengineering, Graduate School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan. |
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Abstract: | We reported previously that human fibroblasts form clumps when cultured on a dish coated with reconstituted type V collagen fibrils. Essentially all the type V collagen fibrils, initially coated on the dish, were recovered in the cell clumps that had eventually formed during the culture. We interpreted that type V collagen fibrils adhere to cells more strongly than to the dish and are detached by cell movements. In this study, type V collagen was suspended with fibroblasts to examine the fate of the type V collagen fibrils and to determine whether the fibrils affect the behaviour of the cells directly adherent to the dish. The added type V collagen accumulated in the intercellular space concomitantly with the local aggregation of fibroblasts. scanning electron microscope examination indicated that type V collagen fibrils were found in the vicinity of cells in cultures without ascorbic acid where essentially no collagen secretion takes place. These results indicate that type V collagen forms fibrils and the fibrils are accumulated in the intercellular spaces. The accumulated type V collagen fibrils work as a cementing material for cell clump formation. This phenomenon is discussed in relation to the possible involvement of type V collagen fibrils in tissue organization. |
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