Dendritic spine head diameter is reduced in the prefrontal cortex of progranulin haploinsufficient mice

Autor: Anna K. Cook, Kelsey M. Greathouse, Phaedra N. Manuel, Noelle H. Cooper, Juliana M. Eberhardt, Cameron D. Freeman, Audrey J. Weber, Jeremy H. Herskowitz, Andrew E. Arrant
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: Molecular Brain, Vol 17, Iss 1, Pp 1-5 (2024)
Druh dokumentu: article
ISSN: 1756-6606
DOI: 10.1186/s13041-024-01095-5
Popis: Abstract Loss-of-function mutations in the progranulin (GRN) gene are an autosomal dominant cause of Frontotemporal Dementia (FTD). These mutations typically result in haploinsufficiency of the progranulin protein. Grn +/– mice provide a model for progranulin haploinsufficiency and develop FTD-like behavioral abnormalities by 9–10 months of age. In previous work, we demonstrated that Grn +/– mice develop a low dominance phenotype in the tube test that is associated with reduced dendritic arborization of layer II/III pyramidal neurons in the prelimbic region of the medial prefrontal cortex (mPFC), a region key for social dominance behavior in the tube test assay. In this study, we investigated whether progranulin haploinsufficiency induced changes in dendritic spine density and morphology. Individual layer II/III pyramidal neurons in the prelimbic mPFC of 9–10 month old wild-type or Grn +/– mice were targeted for iontophoretic microinjection of fluorescent dye, followed by high-resolution confocal microscopy and 3D reconstruction for morphometry analysis. Dendritic spine density in Grn +/– mice was comparable to wild-type littermates, but the apical dendrites in Grn +/– mice had a shift in the proportion of spine types, with fewer stubby spines and more thin spines. Additionally, apical dendrites of Grn +/– mice had longer spines and smaller thin spine head diameter in comparison to wild-type littermates. These changes in spine morphology may contribute to altered circuit-level activity and social dominance deficits in Grn +/– mice.
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