Loss of CD47 Shifts Mouse Hippocampus Toward a Mild Stress-Like State

CD47, a transmembrane protein known for immune and neurodevelopmental roles, has recently been identified as an abundant presynaptic protein in humans, non-human primates, and mice. A new computational study examined what happens to brain cells when this protein is missing under excitotoxic stress, using single-nucleus RNA sequencing of mouse hippocampi.

The research team, led by Mehrdad Kiamari and colleagues, compared wild-type mice with Cd47 knockout mice exposed to kainic acid, a chemical that triggers excitotoxic stress. Mice received either a convulsive dose of 25 mg/kg or a subconvulsive dose of 3 mg/kg, alongside vehicle-treated controls, allowing the investigators to separate the effects of genotype from those of seizure-level stress.

By integrating cell-type annotations with Weighted Gene Co-expression Network Analysis, the team identified distinct neuronal and glial gene modules whose co-expression structure differed both by genotype and by kainic acid exposure. Notably, certain modules showed kainic acid-associated changes in co-expression structure only in Cd47-deficient cells, suggesting the protein’s absence alters how neuronal and glial gene networks respond to stress.

Enrichment analyses of these genotype-sensitive modules pointed to gene sets involved in translation, bioenergetics, and synaptic function, hinting at the cellular processes most affected by the combination of CD47 loss and excitotoxic challenge.

A transcriptome-wide comparison using Wasserstein distance added a striking observation: among all fifteen pairwise comparisons, vehicle-treated knockout cells most closely resembled wild-type cells exposed to the subconvulsive kainic acid dose. In other words, simply losing Cd47 shifted the hippocampal transcriptome toward a state resembling mild excitotoxic stress, even without any drug exposure.

The authors caution that these findings are hypothesis-generating. The study is an observational sequencing analysis in mice, not a demonstration of mechanism or a basis for therapy. Still, it positions Cd47 as a candidate regulator of neuronal stress adaptation and lays out a testable framework for future work on how this presynaptic protein might protect or sensitize the brain during excitotoxic injury.

Subject of Research: Computational analysis of Cd47 deficiency and excitotoxic stress in the mouse hippocampus

Article Title: Cd47 deficiency in mouse brain under excitotoxic stress

Article References: Kiamari, M., Perna, A., Santoro, M., El Ariss, A., Berson, E., Zhao, J., Gajera, C. R., Fox, E. J., Montine, K. S., Aghaeepour, N., & Montine, T. J. (2026). Cd47 deficiency in mouse brain under excitotoxic stress. PLOS Computational Biology, 22(10), e1014897. https://doi.org/10.1371/journal.pcbi.1014897

Image Credits: AI Generated

DOI: 10.1371/journal.pcbi.1014897

Keywords: CD47, kainic acid, excitotoxicity, hippocampus, single-nucleus RNA sequencing, WGCNA, gene co-expression, knockout mice, neuroinflammation, synaptic genes, deficiency, mouse