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Published on: January 12, 2017
Mosquito pericardial cells upregulate Cecropin expression after an immune challenge
Victor Cardoso-Jaime1, Krystal Maya-Maldonado1, Víctor Tsutsumi2
1Centro de Investigaciones Sobre Enfermedades Infecciosas, Instituto Nacional de Salud Pública. Av. Universidad 655, Santa María Ahuacatitlan, Cuernavaca, Morelos, C.P. 62100, Mexico; Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados, IPN. Av. Instituto Politécnico Nacional 2508, Gustavo A. Madero, Ciudad de México, C.P. 07360, Mexico.
Anopheles albimanus pericardial cells are a major source of Cecropin 1, a key immune factor. These cells upregulate Cec1 expression upon immune challenge, suggesting a vital role in mosquito systemic immunity.
Area of Science:
- Mosquito immunology
- Invertebrate pathology
- Vector-borne disease research
Background:
- Mosquitoes transmit pathogens, which face immune defenses during development.
- Hemocytes phagocytose pathogens, but some evade this clearance.
- Pericardial cells (PCs) are known to produce immune factors like lysozymes.
Purpose of the Study:
- To investigate the role of Anopheles albimanus pericardial cells (PCs) in the mosquito immune response.
- To identify specific immune factors produced by PCs.
- To understand how PC immune factor production is regulated.
Main Methods:
- Immunohistochemistry to localize Cecropin 1 (Cec1) production in Anopheles albimanus.
- Gene expression analysis (e.g., RT-qPCR) to assess Cec1 upregulation after immune challenge.
- Analysis of PC location and potential role in hemolymph immune surveillance.
Main Results:
- Anopheles albimanus PCs are identified as a major production site for Cecropin 1 (Cec1).
- PCs significantly upregulate Cec1 expression following an immune challenge.
- The strategic location of PCs suggests a role in releasing Cec1 into the hemolymph.
Conclusions:
- Pericardial cells are a significant source of the antimicrobial peptide Cecropin 1 in Anopheles albimanus.
- Immune stimulation leads to increased Cec1 production by PCs.
- PCs likely contribute substantially to the mosquito's systemic immune defense against pathogens by releasing cecropins.
