Researchers at the BIST centre IBEC, in collaboration with hospitals and international partners, have observed that the deficiency of the cellular prion protein leads to behavioral deficits, learning impairment, and enhanced epilepsy-like excitability of the brain in mice.
Cellular prion protein (PrPC), a molecule located on the surface of neural cells, is known for being imbalanced in human patients suffering neurodegenerative diseases such as Alzheimer’s or Parkinson’s disease. However, increasing knowledge about the participation of PrPC in these diseases contrasts with data regarding its natural and health-promoting role. This means that while in some studies this protein has been described as protective for the brain, in other studies PrPC expression was associated with increased susceptibility to neurotoxicity.
Such inconsistences are mainly due to the absence of an appropriate and well characterised mice models. To shed some light on the real role of PrPC in neural physiology, researchers at the Institute for Bioengineering of Catalonia (IBEC), led by José Antonio del Río, full Professor of the University of Barcelona and group leader of IBEC, have been intensively working in the last five years on new transgenic mice lacking PrPC generated using the TALEN technology, and they now report surprising results in the journal BCM Biology.
Scientists from IBEC’s Molecular and Cellular Neurobiotechnology group, in collaboration with the University Hospital of Zürich, University of Barcelona, and the Pablo de Olavide University in Seville (Spain), have found that absence of PrPC impairs cognitive functions such as associative learning and memory, producing anxiety-like behavior. Experts also found that the deficiency of PrPC leads to an increased susceptibility to epilepsy seizures in these mice.
In their study, the researchers performed a full set of behavioral and operant conditioning tests to evaluate memory and learning capabilities of mice, in parallel with RNAseq, in vitro neuron network analysis and in vivo electrophysiological data. The results showed a clear decreased motility, impaired operant conditioning learning, and anxiety-related behavior in the animals lacking PrPC.
Results demonstrate that PrPC protein promotes neuronal network formation and connectivity, and mediates synaptic function, also protecting from excitotoxic. Deletion of PrPC may underlie an epileptogenic-susceptible brain that fails to perform highly cognitive-demanding tasks such as associative learning and anxiety-like behaviors.
Learn more on the IBEC website.