Cellular immune senescence in mosquitoes accelerates when the temperature is warmer
Jordyn S Barr1, Saksham R Saksena1, Julián F Hillyer1
1Department of Biological Sciences, Vanderbilt University, Nashville, TN, USA.
Developmental and Comparative Immunology
|May 24, 2025
Summary
Warmer temperatures accelerate immune senescence in mosquitoes, weakening their ability to fight infections as they age. This study reveals how environmental heat impacts mosquito immunity and aging processes.
Area of Science:
- Ecology
- Immunology
- Entomology
Background:
- Mosquitoes are poikilotherms whose body temperature depends on their environment.
- Warmer temperatures accelerate mosquito development and metabolism.
- Immune strength declines with age (senescence).
Purpose of the Study:
- To investigate how warmer temperatures and aging interact to affect cellular immunity in mosquitoes.
- To determine the impact of temperature on immune cell numbers and function in aging mosquitoes.
Main Methods:
- Mosquitoes (Anopheles gambiae) were reared at three different temperatures.
- Hemocyte counts and phagocytic activity were measured at four different ages.
- The study examined both circulating and sessile hemocytes.
Main Results:
- Warmer temperatures and aging decreased circulating hemocyte numbers, with faster decline at higher temperatures.
- Sessile hemocyte numbers increased with infection and warmer temperatures but decreased with aging.
- Individual hemocyte phagocytic activity increased with age, with this effect appearing earlier at warmer temperatures.
Conclusions:
- Warmer temperatures accelerate immune senescence in mosquitoes.
- This accelerated aging impacts the mosquito's ability to combat infections in a warming climate.
- Findings have implications for understanding disease vector competence in ectotherms.
