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Lack Of 'Happiness Hormone' Serotonin In Brain Causes Impaired Maternal Behavior In Mice

Date:
June 23, 2009
Source:
Helmholtz Association of German Research Centres
Summary:
A lack of serotonin, commonly known as the "happiness hormone," in the brain slows the growth of mice after birth and is responsible for impaired maternal behavior later in life. Researchers also discovered that the presence of serotonin in the brain is not crucial for the survival of the animals.

A lack of serotonin, commonly known as the "happiness hormone", in the brain slows the growth of mice after birth and is responsible for impaired maternal behavior later in life. This was the result of research conducted by Dr. Natalia Alenina, Dana Kikic, and Professor Michael Bader of the Max Delbrόck Center for Molecular Medicine (MDC) Berlin-Buch, Germany. At the same time, the researchers discovered that the presence of serotonin in the brain is not crucial for the survival of the animals.

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Furthermore, they were able to confirm that there are two strictly separate pathways of serotonin production: One gene is responsible for the formation of serotonin in the brain, another gene for the production of the hormone in the body.

The researchers "switched off" the gene Tph2 in mice to elucidate the function of the gene in the brain. Tph2 produces the enzyme tryptophan hydroxylase (TPH), which is responsible for the formation of serotonin.

After the researchers switched off Tph2, the animals produced almost no serotonin in the brain. Nevertheless, the animals were viable and half of them survived until adulthood. However, they needed more sleep during the day and the regulation of their respiration, body temperature, and blood pressure was altered.

The female mice were able to give birth and produced enough milk to feed their pups, but their impaired maternal behavior led to poor survival of the offspring.

The Tph2 gene was discovered by MDC researchers several years ago together with researchers of the Free University (FU) Berlin and Humboldt University Berlin (HUB).


Story Source:

The above story is based on materials provided by Helmholtz Association of German Research Centres. Note: Materials may be edited for content and length.


Journal Reference:

  1. Natalia Alenina et al. Growth retardation and altered autonomic control in mice lacking brain serotonin. PNAS, June 23, 2009, Vol. 106, No. 25, pp 10332-10337

Cite This Page:

Helmholtz Association of German Research Centres. "Lack Of 'Happiness Hormone' Serotonin In Brain Causes Impaired Maternal Behavior In Mice." ScienceDaily. ScienceDaily, 23 June 2009. <www.sciencedaily.com/releases/2009/06/090623111953.htm>.
Helmholtz Association of German Research Centres. (2009, June 23). Lack Of 'Happiness Hormone' Serotonin In Brain Causes Impaired Maternal Behavior In Mice. ScienceDaily. Retrieved November 22, 2014 from www.sciencedaily.com/releases/2009/06/090623111953.htm
Helmholtz Association of German Research Centres. "Lack Of 'Happiness Hormone' Serotonin In Brain Causes Impaired Maternal Behavior In Mice." ScienceDaily. www.sciencedaily.com/releases/2009/06/090623111953.htm (accessed November 22, 2014).

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