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Neurotransmitters linked to mating behavior are shared by mammals and worms

Date:
October 29, 2012
Source:
Rockefeller University
Summary:
When it comes to sex, animals of all shapes and sizes tend behave in predictable ways. There may be a chemical reason for that. New research has shown that chemicals in the brain -- neuropeptides known as vasopressin and oxytocin -- play a role in coordinating mating and reproductive behavior in animals ranging from humans to fish to invertebrates.

Bad sex. By quantifying the amount of time that worms took to complete several individual mating steps, scientists have demonstrated that individuals lacking the nematocin peptide have poor “reproductive efficiencies.”
Credit: Image courtesy of Rockefeller University

When it comes to sex, animals of all shapes and sizes tend behave in predictable ways. There may be a chemical reason for that. New research from Rockefeller University has shown that chemicals in the brain -- neuropeptides known as vasopressin and oxytocin -- play a role in coordinating mating and reproductive behavior in animals ranging from humans to fish to invertebrates.

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"Our research shows that molecules similar to vasopressin and oxytocin have an ancient and evolutionarily conserved role in controlling a critical social behavior, mating," says Cori Bargmann, Torsten N. Wiesel Professor and head of the Lulu and Anthony Wang Laboratory of Neural Circuits and Behavior. "This work suggests that these molecules encode the same kind of information in the brains of very different animals."

Bargmann, whose laboratory studies the relationship between genes, neural circuits and behavior in the C. elegans roundworm, says vasopressin and oxytocin have been implicated in a variety of reproductive and social behaviors in humans and other mammals, including pair bonding, maternal bonding and aggressive and affiliative behaviors. Mice that lack oxytocin may develop social amnesia, and humans who sniff oxytocin through an inhaler change their cooperative behavior in computer games, behaving as though they "trust" other players more.

Bargmann's team, led by postdoc Jennifer Garrison, identified a peptide and two receptors in C. elegans worms that were similar to the mammalian oxytocin/vasopressin signaling system. Male worms that were engineered to lack this peptide, dubbed nematocin, were clumsy sexual partners.

"Although they could perform the motor aspects of mating, their sequences were inefficient, disorganized and repetitious," says Garrison. "Only a fraction of males lacking the peptide were able to complete mating by transferring sperm within five minutes of first contacting a partner, a time in which normal worms are usually successful."

Males lacking nemotocin or its receptors also spent less time looking for mates, as though they were less motivated to find partners.


Story Source:

The above story is based on materials provided by Rockefeller University. Note: Materials may be edited for content and length.


Journal Reference:

  1. J. L. Garrison, E. Z. Macosko, S. Bernstein, N. Pokala, D. R. Albrecht, C. I. Bargmann. Oxytocin/Vasopressin-Related Peptides Have an Ancient Role in Reproductive Behavior. Science, 2012; 338 (6106): 540 DOI: 10.1126/science.1226201

Cite This Page:

Rockefeller University. "Neurotransmitters linked to mating behavior are shared by mammals and worms." ScienceDaily. ScienceDaily, 29 October 2012. <www.sciencedaily.com/releases/2012/10/121029100630.htm>.
Rockefeller University. (2012, October 29). Neurotransmitters linked to mating behavior are shared by mammals and worms. ScienceDaily. Retrieved January 30, 2015 from www.sciencedaily.com/releases/2012/10/121029100630.htm
Rockefeller University. "Neurotransmitters linked to mating behavior are shared by mammals and worms." ScienceDaily. www.sciencedaily.com/releases/2012/10/121029100630.htm (accessed January 30, 2015).

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