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Serotonin is one of several chemical messengers in the brain, or neurotransmitters, which help brain cells communicate with one another. Among many other functions, serotonin is involved in regulating mood. Problems with making or using the right amount of serotonin have been linked to many mental disorders, including depression, bipolar disorder, anxiety disorder, autism, and schizophrenia.

There are many genes that code for serotonin. Some of these genes guide serotonin production and other are involved in its activity. The serotonin transporter gene makes a protein that directs serotonin from the space between brain cells — where most neurotransmitters are relayed from one cell to another — back into cells, where it can be reused. Since the most widely prescribed class of medications for treating major depression acts by blocking this transporter protein, the gene has been a prime suspect in mood and anxiety disorders.

The serotonin transporter gene has many versions. Since everyone inherits a copy of this gene from each parent, a person may have two copies of the same version or one copy each of two different versions. One version of the serotonin transporter gene makes less protein, resulting in decreased transport of serotonin back into cells. This version has also long been the focus of depression research due to its suggested effect on risk.

Study shows how oils and fats regulate feeling of satiety

Work groups at Technische Universit-t M-nchen under Prof. Peter Schieberle and at the University of Vienna under Prof. Veronika Somoza studied four different edible fats and oils: Lard, butterfat, rapeseed oil and olive oil. [More]
Antipsychotic drugs associated with increased risk of stroke in the elderly

Antipsychotic drugs associated with increased risk of stroke in the elderly

Antipsychotic administration in the elderly is associated with an increased risk for cerebrovascular accident, more commonly known as stroke; a new study published in Biological Psychiatry provides additional insight into this important relationship. [More]
Boosting hypocretin could elevate both mood and alertness in humans

Boosting hypocretin could elevate both mood and alertness in humans

What makes us happy? Family? Money? Love? How about a peptide? The neurochemical changes underlying human emotions and social behavior are largely unknown. Now though, for the first time in humans, scientists at UCLA have measured the release of a specific peptide, a neurotransmitter called hypocretin, that greatly increased when subjects were happy but decreased when they were sad. [More]
Selective activation of the dentate gyrus can reduce anxiety without affecting learning

Selective activation of the dentate gyrus can reduce anxiety without affecting learning

Columbia University Medical Center (CUMC) researchers have found the first evidence that selective activation of the dentate gyrus, a portion of the hippocampus, can reduce anxiety without affecting learning. [More]

High iron and zinc intake may reduce risk of pre-menstrual syndrome in women

Women who reported eating a diet rich in iron were 30 to 40 percent less likely to develop pre-menstrual syndrome (PMS) than women who consumed lower amounts, in a study reported this week by researchers at the University of Massachusetts Amherst School of Public Health and Health Sciences and Harvard. [More]
Complementary medicine risks: an interview with Dr Andrew Boyden, NPS MedicineWise

Complementary medicine risks: an interview with Dr Andrew Boyden, NPS MedicineWise

Complementary medicines include products containing herbs, vitamins, minerals, nutritional supplements, homoeopathic medicines, certain aromatherapy products and traditional Chinese medicines. For this reason they are also called herbal, natural or alternative medicines. [More]
Research on animal models demonstrates that antidepressants are not a cure as such

Research on animal models demonstrates that antidepressants are not a cure as such

We should reconsider how we use antidepressants more effectively. The latest studies have shown that antidepressants restore the capacity of certain areas of the brain to repair abnormal neural pathways. According to neuroscientist Eero Castrén, the recipient of EUR 2.5 million of ERC funding, recovery requires redirection of these pathways through practice, rehabilitation or therapy. [More]
Physiotherapy aids defecation in constipated children

Physiotherapy aids defecation in constipated children

Physiotherapy may be an effective complementary therapy to laxatives for treating constipation in children, research indicates. [More]

Study finds chemical cues that allow seals’ brain to remain half awake and asleep

A new study led by an international team of biologists has identified some of the brain chemicals that allow seals to sleep with half of their brain at a time. [More]
Patients with untreated depression are poorly protected by shingles vaccination

Patients with untreated depression are poorly protected by shingles vaccination

Results from a new study published in Clinical Infectious Diseases suggest a link between untreated depression in older adults and decreased effectiveness of the herpes zoster, or shingles, vaccine. [More]
Depression reduces efficacy of shingles vaccine

Depression reduces efficacy of shingles vaccine

Research suggests that the varicella zoster, or shingles, vaccine is less effective in older people with untreated depression. [More]
Researchers identify new way to influence the vital serotonin signaling system

Researchers identify new way to influence the vital serotonin signaling system

An interdisciplinary team of researchers from the University of Texas Medical Branch at Galveston and the University of Houston has found a new way to influence the vital serotonin signaling system - possibly leading to more effective medications with fewer side effects. [More]
Threat vigilance can protect soldiers against PTSD

Threat vigilance can protect soldiers against PTSD

The onset of Post-Traumatic Stress Disorder (PTSD) is unpredictable. Because it depends on the unforeseeable occurrence of traumatic events, it is difficult to identify preventative or causative factors. Scientists typically turn to patients who have already developed PTSD to study the disorder, but that means they can't draw comparisons to their psychological state prior to experiencing trauma. [More]
CELF6 genetic mutation may underlie common behaviors seen in people with autism

CELF6 genetic mutation may underlie common behaviors seen in people with autism

Scientists at Washington University School of Medicine in St. Louis have identified a genetic mutation that may underlie common behaviors seen in some people with autism, such as difficulty communicating and resistance to change. [More]
Northwestern Medicine expert offers tips to battle seasonal affective disorder

Northwestern Medicine expert offers tips to battle seasonal affective disorder

Winter is in full force. With short days and less exposure to sunlight, everyone feels less energetic and more people are vulnerable to depression. Seasonal Affective Disorder (SAD), or winter depression, is a mood disorder related to seasonal variations of light. Symptoms start in late fall and oftentimes last until April or early spring. It affects between 10 to 20 percent of Americans, primarily younger adults and women. [More]

Broken motors induce stress and anxiety in mice

When motors break down, getting where you want to go becomes a struggle. Problems arise in much the same way for critical brain receptors when the molecular motors they depend on fail to operate. Now, researchers reporting in Cell Reports, a Cell Press publication, on February 7, have shown these broken motors induce stress and anxiety in mice. The discovery may point the way to new kinds of drugs to treat anxiety and other disorders. [More]

Book reviews psilocybin's potential in alleviating psychological distress in cancer patients

Improvements in the diagnosis and treatment of cancers in recent years have led to a marked increase in patients' physical survival rates. While doctors can treat the physical disease, what is not well understood is how best to address the psychological needs of patients with cancer. [More]
STA announces results from ABRAXANE plus gemcitabine phase III trial on pancreatic cancer

STA announces results from ABRAXANE plus gemcitabine phase III trial on pancreatic cancer

Australian biopharmaceutical company Specialised Therapeutics Australia announces that a phase III clinical trial of world leading breast cancer drug ABRAXANE (nanoparticle albumin-bound paclitaxel) in combination with current standard of care gemcitabine in patients with advanced pancreatic cancer has demonstrated substantially improved survival times, with double the number of patients surviving two years. [More]
Itch-specific nerve cells: an interview with Associate Professor Xinzhong Dong

Itch-specific nerve cells: an interview with Associate Professor Xinzhong Dong

Itch was actually defined by a German physician more than 350 years ago. His name was Samuel Hafenreffer. He defined itch as an unpleasant sensation that makes people want to scratch. You probably think this is a very simple definition but itch is really a very complex sensory modality. [More]

TMD pain might reflect physical manifestation of anxiety or depression

There is an ongoing debate about the role of psychological disorder symptoms as risk factors for temporomandibular joint (TMJ) pain. Previous studies have associated depression and TMJ pain but large scale studies have not been performed. [More]