Could hypertension drugs help people with Alzheimer’s?

(Health Canal) — A new study has looked at whether certain types of drugs used to treat high blood pressure, also called hypertension, might have beneficial effects in reducing the number of new cases of Alzheimer’s disease each year.

The team of researchers from the University of Bristol have looked at whether drugs already being used to treat hypertension, particularly ones that specifically reduce the activity of a biochemical pathway, called the renin angiotensin system, might reduce the occurrence of Alzheimer’s and another common type of dementia called vascular dementia.

The study, conducted with the support from North Bristol NHS Trust and published online in the Journal of Alzheimer’s Disease, stems from work by one of the team’s members, Dr Patrick Kehoe.  Dr Kehoe, who is a Reader in Translational Dementia Research and co-leads the Dementia Research Group at Frenchay Hospital, Bristol, is a leading authority on the possible role of the renin angiotensin system in Alzheimer’s.

This pathway is very important in blood pressure regulation and, for at least a decade, links between hypertension and dementia have been known but poorly understood.

In more recent years it has been shown that certain signals produced by this pathway contribute to a number of the damaging effects often seen in the brains of people with Alzheimer’s.  These include memory loss, lowered blood circulation in the brain, higher levels of brain inflammation and increased levels of brain cell death due to reduced oxygen circulation.

Dr Patrick Kehoe said: “Drugs that can prevent Alzheimer’s occurring at all, or delaying its onset would have a substantial benefit on the lives of future sufferers, their families, as well as an overstretched health care system.

“Current Alzheimer’s drugs treat memory loss by attempting to correct chemical imbalances in the brain but these only work for a limited time.  This limited treatment period is because the drugs are unable to stop the underlying mechanisms that cause the disease.  Therefore the need to find new ways of stopping Alzheimer’s goes on.”

Dr Kehoe’s research led him to experts in the study of risk factors for disease in large populations and datasets.  Professors Richard Martin and Yoav Ben-Shlomo, and researcher Neil Davies in the University’s School of Social and Community Medicine, used the General Practice Research Database, which holds anonymised data on approximately ten million people who attend General Practitioner surgeries around the UK.  The research team made some very interesting observations in what is one of the largest studies of its kind on dementia in the UK.

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