A new Tel Aviv University study identified a gene coding for a protein that turns off neurotransmission signalling, which contributes to Alzheimer’s disease (AD).
The gene, called RGS2 (Regulator of Protein Signalling 2), has never before been implicated in AD. The researchers report that lower RGS2 expression in AD patient cells increases their sensitivity to toxic effects of amyloid-ß. The study may lead to new avenues for diagnosing Alzheimer’s disease — possibly a blood test — and new therapies to halt the progression of the disease.
The research was led by Dr. David Gurwitz of the Department of Human Molecular Genetics and Biochemistry at TAU’s Sackler School of Medicine and Prof. Illana Gozes, the incumbent of the Lily and Avraham Gildor Chair for the Investigation of Growth Factors; Head of the Elton Laboratory for Molecular Neuroendocrinology at TAU’s Sackler School of Medicine; and a member of TAU’s Adams Super Center for Brain Studies and TAU’s Sagol School of Neuroscience.
“Alzheimer’s researchers have until now zeroed in on two specific pathological hallmarks of the chronic neurodegenerative disease: deposits of misfolded amyloid-ß (Aß) peptide plaques, and phosphorylated tau protein neurofibrillary tangles found in diseased brains,” Dr. Gurwitz said. “But recent studies suggest amyloid-? plaques are also a common feature of healthy older brains. This raises questions about the central role of A? peptides in Alzheimer’s disease pathology.”
The researchers pinpointed a common suspect — the RGS2 gene — by combining genome-wide gene expression profiling of Alzheimer’s disease blood-derived cell lines with data-mining of previously published gene expression datasets. They found a reduced expression of RGS2 in Alzheimer’s disease blood-derived cell lines, then validated the observation by examining datasets derived from blood samples and post-mortem brain tissue samples from Alzheimer’s patients.
“Several genes and their protein products are already known to be implicated in Alzheimer’s disease pathology, but RGS2 has never been studied in this context,” Dr. Gurwitz said. “We now propose that whether or not Aß is a primary culprit in Alzheimer’s disease, neuroprotective mechanisms activated during early disease phases lead to reduced RGS2 expression.”
The new TAU study furthermore proposes that reduced RGS2 expression increases the susceptibility of brain neurons to the potentially damaging effects of Aß.
“We found that reduced expression of RGS2 is already noticeable in blood cells during mild cognitive impairment, the earliest phase of Alzheimer’s,” Dr. Gurwitz observed. “This supported our theory that the reduced RGS2 expression represents a ‘protective mechanism’ triggered by ongoing brain neurodegeneration.”
The team further found that the reduced expression of RGS2 was correlated with increased Aß neurotoxicity. It acted like a double-edged sword, allowing the diseased brain to function with fewer neurons, while increasing damage to it by accumulating misfolded Aß.
“Our new observations must now be corroborated by other research groups,” Dr. Gurwitz concluded. “The next step will be to design early blood diagnostics and novel therapeutics to offset the negative effects of reduced expression of the RGS2 protein in the brain.”
American Friends of Tel Aviv University
http://tinyurl.com/h6nz7pf
https://clinlabint.com/wp-content/uploads/sites/2/2020/06/clinlab-logo.png003wmediahttps://clinlabint.com/wp-content/uploads/sites/2/2020/06/clinlab-logo.png3wmedia2020-08-26 09:33:002021-01-08 11:09:37Discovery of neurotransmission gene may pave way for early detection of Alzheimer’s Disease
We may ask you to place cookies on your device. We use cookies to let us know when you visit our websites, how you interact with us, to enrich your user experience and to customise your relationship with our website.
Click on the different sections for more information. You can also change some of your preferences. Please note that blocking some types of cookies may affect your experience on our websites and the services we can provide.
Essential Website Cookies
These cookies are strictly necessary to provide you with services available through our website and to use some of its features.
Because these cookies are strictly necessary to provide the website, refusing them will affect the functioning of our site. You can always block or delete cookies by changing your browser settings and block all cookies on this website forcibly. But this will always ask you to accept/refuse cookies when you visit our site again.
We fully respect if you want to refuse cookies, but to avoid asking you each time again to kindly allow us to store a cookie for that purpose. You are always free to unsubscribe or other cookies to get a better experience. If you refuse cookies, we will delete all cookies set in our domain.
We provide you with a list of cookies stored on your computer in our domain, so that you can check what we have stored. For security reasons, we cannot display or modify cookies from other domains. You can check these in your browser's security settings.
.
Google Analytics Cookies
These cookies collect information that is used in aggregate form to help us understand how our website is used or how effective our marketing campaigns are, or to help us customise our website and application for you to improve your experience.
If you do not want us to track your visit to our site, you can disable this in your browser here:
.
Other external services
We also use various external services such as Google Webfonts, Google Maps and external video providers. Since these providers may collect personal data such as your IP address, you can block them here. Please note that this may significantly reduce the functionality and appearance of our site. Changes will only be effective once you reload the page
Google Webfont Settings:
Google Maps Settings:
Google reCaptcha settings:
Vimeo and Youtube videos embedding:
.
Privacy Beleid
U kunt meer lezen over onze cookies en privacy-instellingen op onze Privacybeleid-pagina.