Determination by HPLC-RIA of immunoreactive prostaglandin E2 in Blattella germanica and Gryllus bimaculatus | JoVE Visualize

Determination by HPLC-RIA of immunoreactive prostaglandin E2 in Blattella germanica and Gryllus bimaculatus

J Casas, J Roselló, E Gelpí

Revista Espanola De Fisiologia|December 1, 1986

View abstract on PubMed

Summary

Male crickets show increased prostaglandin E2 (PGE2) levels when females are present. In contrast, cockroach PGE2 levels remain unchanged between virgin and mated individuals, indicating species-specific differences in this prostanoid

Area of Science:

Insect physiology
Endocrinology
Reproductive biology

Background:

Prostaglandin E2 (PGE2) is a crucial prostanoid involved in various physiological processes in insects.
Understanding PGE2 regulation is key to comprehending insect reproductive strategies and behaviors.

Purpose of the Study:

To quantify immunoreactive PGE2 levels in male Gryllus bimaculatus (crickets) and male/female Blattella germanica (cockroaches).
To investigate the effect of mating status on PGE2 levels in these insect species.
To compare the regulation of PGE2 biosynthesis between Orthoptera and Dictyoptera.

Main Methods:

Combined High-Performance Liquid Chromatography (HPLC) and Radioimmunoassay (RIA) methodology.
Analysis of PGE2 levels in cricket (Gryllus bimaculatus) males and cockroach (Blattella germanica) males and females.
Comparison of PGE2 levels between virgin and mated individuals in both species.

Main Results:

Male crickets (Gryllus bimaculatus) exhibited significantly higher PGE2 levels in the presence of females.
No significant differences in PGE2 content were observed between virgin and mated male and female cockroaches (Blattella germanica).
These findings highlight distinct regulatory mechanisms of PGE2 in crickets versus cockroaches.

Conclusions:

Female presence stimulates PGE2 levels in male crickets, suggesting a role in reproductive signaling.
PGE2 biosynthesis patterns in crickets are not universally applicable to Dictyoptera, as shown by the lack of mating effect in cockroaches.
The study underscores the species-specific regulation of prostanoids in insects, particularly concerning reproductive status.