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      저자 : Yancong Zhou (검색결과 1 건)
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        Morphological and functional characterization of isolated stem cells from the midgut of Chilo suppressalis larvae

        Yancong Zhou,Biantao Jia,Lanzhi Han,Yufa Peng 한국응용곤충학회 2019 Journal of Asia-Pacific Entomology Vol.22 No.3

        The proliferation and differentiation of stem cell populations allow the midgut to grow/regenerate in lepidopteran insect. Basic epithelial regenerative functions can be assessed in vitro by purifying these stem and mature cell populations. Therefore, we isolated and purified stem and mature cells from the midgut of C. suppressalis larvae by density gradient centrifugation and observed the morphologies of these cells. A flow cytometry method was used to monitor C. suppressalis stem cell proliferation and differentiation under different cell culture conditions. We observed high proportions of the stem and differentiating cells in third- and fourth-instar larvae, respectively, indicating that, in larvae, stem cells rapidly proliferate early in development and are strongly differentiated at late stages. Incubation in medium supplemented with fat body extract and ecdysone resulted in a significantly increased proportion of stem cells, not of the differentiating cells, indicating that co-culture with fat body extract and ecdysone stimulates the proliferation of C. suppressalis stem cells. Viability bioassays showed that Cry1Ab displayed significant cytotoxic effects on the midgut cell culture of C. suppressalis. The proportion of differentiating cells was significantly increased after a 48-h exposure to sublethal doses of Cry1Ab toxin, and peaked at the Cry1Ab concentration of 0.3 μg/ml, demonstrating that epithelial cells with strong regenerative capacity via the differentiation of stem cells. These results improve our understanding of C. suppressalis stem cell biology and illustrate the potential role of the enhanced midgut regeneration induced by stem cell proliferation or differentiation as a reparation mechanism to Bt toxin.

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