A team at the USC Mark and Mary Stevens Neuroimaging and Informatics Institute, part of the Keck School of Medicine of USC, has received a five-year NIH R01 award to tackle a question that has resisted answers for decades: how the death of particular neurons in the hippocampus translates into the memory and thinking problems that define Alzheimer's disease. The project is led by Michael S. Bienkowski, PhD, an assistant professor of physiology and neuroscience and of biomedical engineering.
The centerpiece is what researchers call a cell type-specific multiscale model of the hippocampus. In practical terms, that means linking several levels of brain organization at once - individual cells, the circuits they form, the regions those circuits sit in, and the whole-brain networks those regions feed into. The point is to see how a change at one level ripples upward. The hippocampus is a logical place to start: it is central to forming new memories and among the first areas Alzheimer's damages.
Why this matters comes down to a detail that is easy to overlook in the usual amyloid-and-tau story. Those toxic protein deposits are a hallmark of the disease, but they do not harm all neurons equally. Some cell types are vulnerable and others are relatively spared, and no one has fully mapped which is which or what that selective loss does to the circuits supporting memory. Pinning that down could identify the specific pathways behind cognitive decline and, with them, new targets for treatments given earlier in the disease course.
The scale of the problem gives the work urgency. Alzheimer's affects more than 6 million Americans, a figure projected to nearly double by 2050. This is foundational research rather than a therapy in testing, and a five-year grant timeline means any clinical payoff is well down the road - but detailed maps of which cells fail first are exactly the kind of groundwork that earlier intervention strategies will need.