Infections Damage Our Brain's Ability to Form Spatial Memories: Research

A new research suggests that increased inflammation following an infection impairs the brain's ability to form spatial memories.

The impairment results from a decrease in glucose metabolism in the brain's memory centre, disrupting the neural circuits involved in learning and memory.

Scientists Discover New Treatment for Deadly Bacterial Infections
In Singapore, scientists have found that asparaginase (ASNASE) - the enzyme that degrades the amino acid asparagine and serves as a common chemotherapeutic agent - arrests Group A Streptococcus (GAS) growth in human blood and blocks bacteria's proliferation.

Inflammation has long been linked to disorders of memory like Alzheimer's disease. Severe infections can also impair cognitive function in healthy elderly individuals. The new findings published in the journal Biological Psychiatry help explain why inflammation impairs memory and could spur the development of new drugs targeting the immune system to treat dementia.

In the first trial to image how inflammation impairs human memory, the team at Brighton and Sussex Medical School scanned 20 participants before and after either a benign salty water injection or typhoid vaccination, used to induce inflammation. Positron emission tomography (PET) was used to measure the effects of inflammation on the consumption of glucose in the brain and after each scan participants tested their spatial memory by performing a series of tasks in a virtual reality.

A reduction in glucose metabolism within the brain's memory centre, known as the Medial Temporal Lobe (MTL), was seen following inflammation. Participants also performed less well in spatial memory tasks, an effect that appeared to be directly mediated by the change in MTL metabolism.

Scientists Demonstrate Method to Find New Therapies to Prevent Cell Death from Infection
The power of a new drug discovery technique, which allows researchers to find antibodies that have a desired effect on cells, has been demonstrated by scientists at The Scripps Research Institute.

"We have known for some time that severe infections can lead to long-term cognitive impairment in the elderly. Infections are also a common trigger for acute decline in function in patients with dementia and Alzheimer's disease," explains Dr Neil Harrison, a Wellcome Trust Intermediate Clinical Fellow at BSMS who led the study. "This study suggests that catching a cold or the flu, which leads to inflammation in the brain, could impair our memory."

Infections are unlikely to cause long-term detrimental impact in the young and healthy but the findings are of great significance in the elderly. The team now plan to investigate the role of inflammation in dementia, including insight into how acute infections such as influenza influence the rate of progression and decline.

Diabetes Increases Kejriwal�s Risk of Developing Infections
Being a diabetic patient increases Delhi Chief Minister Arvind Kejriwal’s risk of developing cold and chest infections compared to others, doctors said.

"Our findings suggest that the brain's memory circuits are particularly sensitive to inflammation and help clarify the association between inflammation and decline in dementia," says Dr Harrison. "If we can control levels of inflammation, we may be able to reduce the rate of decline in patients' cognition."

Source-Eurekalert

Two Small RNAs Combine to Help Initiate E.coli Infection in Epithelial Cells
A new study reveals that the combined work of two small RNAs allows the deadly enterohemorrhagic Escherichia coli 0157:H7 to attach and infect the epithelial cells that line the digestive tract.