PRNP and dementia: Thus the function of PrPC is not well-established, though some functions (learning, neuroprotection) are very intriguing observations in the context of dementia but do not yet have a molecular mechanism [43,52,54,55,56,57,59,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80].