Isolation and characterization of undifferentiated cells of embryonated eggs from Aedes aegypti (Linnaeus 1762)

Author(s)

Lara Carolina Mario

• Document type: Master's Dissertation
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Faculdade de Medicina Veterinária e Zootecnia (FMVZ/SBD)
• Defense date: 2015-02-09

Examining board members

Maria Angélica Miglino; Ana Flávia de Carvalho; Ana Claudia Oliveira Carreira Nishiyama

• Advisor: Maria Angélica Miglino

Abstract

A major problem of public health in the country is directly linked to dengue, as approximately 550 million people are infected annually, and about 20,000 have died. This disease is caused by the virus of the Flaviviridae family, transmitted by the female to the host during blood feeding. This project aimed to isolate and characterize stem cells from fertilized eggs and larvae gut fourth instar Aedes aegypti, as a source of research in cell biology and structural area of these vectors. Upon cell culture, the cells were isolated and recultured in DMEM-high culture temperature and 28 º C. The following analyzes were performed: cell morphology, cell cycle tests immunophenotyping by flow cytometry and immunohistochemistry analysis. The Aedes aegypti cells analyzed by cell morphology showed globular shape, small size and heterogenic population. The analysis of sub-G1 phase of the cycle, G0, G1, S and G2-M after primary culture reached embryonated eggs (27.5%, 68%, 30.2% and 1.9%, respectively). Achieved after 24 hours (10%, 92.4%, 6.2% and 0.6%, respectively). Immunophenotyping analysis by flow cytometry demonstrated in embryonated eggs, positive for pluripotency markers, as well as low expression of Oct 3/4 and high expression for the (Sox2). The mesenchymal cells had high expression for markers (Stro-1, vimentin and Nestin). The marker of cell death by apoptosis (Caspase3) had high expression in cultured cells, whereas the endosomal markers specific for insect cells (GM130 and Anti-Anti RAB 5) were also highly expressed. In cell culture derived from the gut of larvae of Aedes aegypti, the analysis of pluripotency markers such as Oct for 3/4 showed no expression, however, the marker Sox2 was highly expressed in the culture. For mesenchymal cells no expression of any label used, ie (Stro-1, Nestin and vimentin). However marker for cell death by apoptosis (caspase 3) cells in culture showed high expression, whereas for the specific endosomal markers insects they were highly labeled. The immunohistochemistry test on embryonated eggs at the end of the incubation period the cells have demonstrated potential ploriferativo by positive staining for PCNA. Pluripotent cells were slightly expressed by markers Nanog, Oct 3/4, Sox2, and expressed by the marker. The cells of mesenchymal origin were highly expressed by SSEA-4 markers, Stro-1, Nestin and vimentin as well as the specific endosomal markers for insect cells, which showed high expression in cells of Aedes embryos. Therefore, it is concluded that both embryonated eggs as room instar larvae of Aedes aegypti have undifferentiated cells, with great potential for studies of molecular biology, targeting the biological control of this vector (AU)

• FAPESP's process: 13/07649-2 - Isolation and characterization of undifferentiated cells of embryonic eggs from Aedes aegypti (Linnaeus, 1762)
• Grantee: Lara Carolina Mario
• Support Opportunities: Scholarships in Brazil - Master