Display Settings:


Send to:

Choose Destination
See comment in PubMed Commons below
PLoS One. 2012;7(11):e51126. doi: 10.1371/journal.pone.0051126. Epub 2012 Nov 30.

Exposure to exogenous enkephalins disrupts reproductive development in the Eastern lubber grasshopper, Romalea microptera (Insecta: Orthoptera).

Author information

  • 1Department of Biology, University of Central Florida, Orlando, FL, USA. skumar@knights.ucf.edu

Erratum in

  • PLoS One. 2013;8(5). doi:10.1371/annotation/7c19edf3-4648-45de-8132-16092fc4bf40. Ganji, Purnachandra Nagaraju [corrected to Nagaraju, Ganji Purnachandra].


Enkephalins play a major role in reproductive physiology in crustaceans; however their role in reproductive development in insects is largely unknown. We investigated the effect of exposure to exogenous leucine-enkephalin (Leu-Enk), methionine-enkephalin (Met-Enk), and the opioid antagonist naloxone on gonad development in the Eastern lubber grasshopper, Romalea microptera. Injection of either Leu-Enk or naloxone alone significantly increased the testicular index and testicular follicular diameter in males, and the ovarian index, oocyte length, and oocyte diameter in females. In contrast, injection of Met-Enk inhibited all measures of reproductive development in both sexes. Surprisingly, co-injection of naloxone with either enkephalin enhanced the effect associated with administration of the enkephalin alone. This study clearly demonstrates the ability of enkephalins to disrupt insect sexual development and also suggests the existence of conserved enkephaline-dependent regulatory mechanisms in insects and crustaceans.

[PubMed - indexed for MEDLINE]
Free PMC Article

Images from this publication.See all images (2)Free text

Figure 1
Figure 2
PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Public Library of Science Icon for PubMed Central
    Loading ...
    Write to the Help Desk