London, Aug 9, Seasonal allergies like hay fever reduce the presence of brain immune cells as well as increase the growth of nervous tissue, which may lead to changes in the brain, aacording to research.
Hay fever may do more than give you a stuffy nose and itchy eyes, sinus pressure,congestion, seasonal allergies may change the brain,an allergic response to outdoor or indoor allergens, says a study.
10 to 30% of the population worldwide suffers from hay fever. According to a report by the World Health Oragnisation (WHO).
The findings showed that brains of mice when exposed to a model of grass pollen allergy actually produced more neurons than when they were under normal conditions.
During an allergic reaction, an increase in the numbers of new neurons in the hippocampus — the part of the brain responsible for forming new memories, and the site where neurons continue to be formed throughout life — was found.
The formation and functioning of neurons is linked to the brain’s immune cells, the microglia.
This raised the question that what could be the consequences of allergies on memory, the researchers said.
In addition, the allergy also reduced the presence of microglia — brain immune cells that perform immune system functions in the central nervous system – activity. The microglia in the brain of mice were found deactivated.
“We know that the response of immune system in the body is different in case of an allergic reaction versus a bacterial infection. What this tells us is that the effect on the brain depends on type of immune reaction in the body,” Klein added.
Allergic reaction also causes an increase in neurogenesis, the growth and development of nervous tissue, which is known to decline with age.