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Meconial peritrophic matrix structure, formation, and meconial degeneration in mosquito pupae/pharate adults:
Abelardo C Moncayo1, Kriangkrai Lerdthusnee, Renato Leon
1Tennessee Department of Health Communicable and Environmental Disease Services, Nashville 37247-4911, USA.
Abstract:
The noncellular peritrophic matrix (PM) that forms around the food bolus in the midgut of many arthropod species may influence the fate of ingested microbes. In mosquitoes, PMs have been identified in the pupal as well as larval and adult stages. In pupae, the PMs surround the meconium, the sloughed larval midgut epithelium. Meconial PM1 (MPM1) forms early in the pupal stadium, and a second meconial PM (MPM2) sometimes forms around the time of adult emergence. A recent study suggests that MPMs contribute to the sterilization of the adult midgut by sequestering microorganisms ingested during the larval stage, which, along with remaining meconial material, are egested after adult emergence. We have compared MPM1 formation and patterns of meconial degeneration in representative species in five mosquito genera and identified a temporal association between MPM1 formation, meconial degeneration, and apolysis. Ultrastructural study of MPM1 and MPM2 in Aedes aegypti (L.) revealed that MPM1 seems to be structurally different from either the larval or adult PMs, whereas MPM2 more closely resembles PM formed around a bloodmeal in adult females. Our results are consistent with the microbial sequestration role.
Insights
Mosquito pupal peritrophic matrices (PMs) sequester ingested microbes, aiding adult midgut sterilization. This process involves meconial PM formation, degeneration, and apolysis, ensuring microbial elimination.
Area of Science:
- Entomology
- Microbiology
- Cell Biology
Background:
- The noncellular peritrophic matrix (PM) in arthropod midguts influences ingested microbe fate.
- Mosquitoes possess PMs across larval, pupal, and adult stages.
- Pupal PMs surround meconium, aiding potential midgut sterilization.
Purpose of the Study:
- To compare meconial PM1 formation and meconial degeneration patterns across five mosquito genera.
- To investigate the structural characteristics of meconial PMs (MPM1 and MPM2) in Aedes aegypti.
- To evaluate the role of meconial PMs in microbial sequestration and adult midgut sterilization.
Main Methods:
- Comparative analysis of MPM1 formation and meconial degeneration in different mosquito species.
- Ultrastructural examination of MPM1 and MPM2 in Aedes aegypti.
- Temporal correlation analysis between MPM1 formation, meconial degeneration, and apolysis.
Main Results:
- A temporal association was identified between MPM1 formation, meconial degeneration, and apolysis.
- MPM1 exhibits distinct structural differences from larval and adult PMs.
- MPM2 shows structural similarities to the adult female bloodmeal PM.
Conclusions:
- The findings support the proposed role of meconial PMs in sequestering microorganisms.
- MPM formation and meconial degeneration contribute to the sterilization of the adult mosquito midgut.
- Structural variations in MPMs suggest stage-specific functions in microbial management.
