کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2840465 1165323 2013 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cell death mechanisms during follicular atresia in Dipetalogaster maxima, a vector of Chagas’ disease (Hemiptera: Reduviidae)
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش حشره شناسی
پیش نمایش صفحه اول مقاله
Cell death mechanisms during follicular atresia in Dipetalogaster maxima, a vector of Chagas’ disease (Hemiptera: Reduviidae)
چکیده انگلیسی


• In early atresia, follicular cells predominantly exhibited features of apoptosis.
• High levels of acid phosphatase activity were detected in all atretic stages.
• The relevance of autophagy at late atresia was supported by cellular findings and changes on its marker.
• In late follicular atresia, cells also displayed changes compatible with necrosis.

In this work we have analyzed the involvement of cell death pathways during the process of follicular atresia in the hematophagous insect vector Dipetalogaster maxima. Standardized insect rearing conditions were established to induce a gradual follicular degeneration stage by depriving females of blood meal during post-vitellogenesis. We first characterized the morpho-histological and ultrastructural changes of the ovarian tissue at early and late follicular atresia by light and transmission electron microscopy. Apoptosis was investigated by DAPI nuclear staining, TUNEL labeling and the detection of active caspase-3 by immunofluorescence. Autophagy was assessed by the measurement of acid phosphatase activity in ovarian homogenates and monitored by the detection of the specific marker of autophagic compartments, LC3. High levels of acid phosphatase activity were detected at all atretic stages. However, follicular cells of follicles undergoing incipient degeneration in early atresia exhibited features of apoptosis such as chromatin condensation, DNA fragmentation and the presence of active caspase-3. The ultrastructural findings and the increased levels of LC3-II found at late follicular atresia supported the relevance of autophagy at this atretic stage, although the extent of autophagosome formation demonstrated that this cell death pathway also occurred at early atresia. In late atresia, follicular cells also displayed more drastic changes compatible with necrosis. Taken together, results showed that apoptosis, autophagy and necrosis were operative during follicular atresia in D. maxima. Moreover, it was shown that the relevance of these cell death mechanisms correlates with the time elapsed since the onset of the degenerative process.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Insect Physiology - Volume 59, Issue 5, May 2013, Pages 532–541
نویسندگان
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