Biology of love at first sight: Study explains the mechanism of "Cupid's arrow"

August 15, 2014

Waseda university researchers have identified certain chemicals in the brain which regulate downstream reproductive hormones of males.

A group led by Yasuko Tobari and Kazuyoshi Tsutsui, of Waseda University's Center for Advanced Biomedical Sciences (TWIns) , have published research outlining how the presence of the opposite sex triggers changes in animals' behavior.

It is known that the presence of a female causes rapid decreases in plasma testosterone levels in male Japanese quail, but little is known about the neural pathway linking social encounters to hormonal change.

The researchers identified certain chemicals in the brain which regulate downstream reproductive hormones of .

Major results:

- A female presence increases GnIH precursor mRNA expression in the and decreases luteinizing hormone (LH) concentration in the plasma of males;
- A female presence increases norepinephrine (NE) release in the hypothalamus of males;
- NE stimulates the release of GnIH from the hypothalamus in vitro and inhibits plasma LH secretion;
- NE neurons project to GnIH neurons that express NE (noradrenergic α2A subtype) receptor mRNA.

Since norepinephrine and GnIH are both found in humans, a similar neural mechanism may exist in us as well, meaning that the current research could help understand love at first sight.

Explore further: Stress puts double whammy on reproductive system, fertility

More information: Yasuko Tobari, You Lee Son, Takayoshi Ubuka, Yoshihisa Hasegawa, and Kazuyoshi Tsutsui, "A new pathway mediating social effects on the endocrine system: Female presence acting via norepinephrine release stimulates gonadotropin-inhibitory hormone in the paraventricular nucleus and suppresses luteinizing hormone in quail", Journal of Neuroscience, July 17, 2014. www.jneurosci.org/content/34/29/9803

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RobertKarlStonjek
not rated yet Aug 15, 2014
The authors have confused lust, the desire for sex, with love, the desire to incorporate something or someone into one's self identification.

Love at first sight also happens when a motoring enthusiast sees the perfect motor vehicle...this is unrelated to sex, obviously.
JVK
1 / 5 (2) Aug 16, 2014
In 1992, I first presented the model that linked the presence of other mammals to differences in GnRH and LH secretion via the sense of smell. In 1995 I published a book about that fact with co-author Robert T. Francoeur. In 1996, I co-authored a Hormones and Behavior review that linked what was known about molecular epigenetics to sex differences in cell types and behavior in species from microbes to man. Two award-winning publications then led to other publications and finally to my most recently published review: Nutrient-dependent/pheromone-controlled adaptive evolution: a model. http://www.ncbi.n...24693353

It integrates everything known about how changes in the nutrient-dependent microRNA/messenger RNA balance lead to differentiation of cell types and behavior in species from microbes to man via the conserved molecular mechanisms manifested in the nutrient-dependent pheromone-controlled regulation of GnRH and LH secretion in all mammals.

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