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ATP6AP2 over-expression causes morphological alterations in the hippocampus and in hippocampus-related behaviour

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Abstract

The (pro)renin receptor [(P)RR], also known as ATP6AP2 [ATPase 6 accessory protein 2], is highly expressed in the brain. ATP6AP2 plays a role in early brain development, adult hippocampal neurogenesis and in cognitive functions. Lack of ATP6AP2 has deleterious effects, and mutations of ATP6AP2 in humans are associated with, e.g. X-linked intellectual disability. However, little is known about the effects of over-expression of ATP6AP2 in the adult brain. We hypothesized that mice over-expressing ATP6AP2 in the brain might exhibit altered neuroanatomical features and behavioural responses. To this end, we investigated heterozygous transgenic female mice and confirmed increased levels of ATP6AP2 in the brain. Our data show that over-expression of ATP6AP2 does not affect adult hippocampal neurogenesis, exercise-induced cell proliferation, or dendritic spine densities in the hippocampus. Only a reduced ventricular volume on the gross morphological level was found. However, ATP6AP2 over-expressing mice displayed altered exploratory behaviour with respect to the hole-board and novel object recognition tests. Moreover, primary adult hippocampal neural stem cells over-expressing ATP6AP2 exhibit a faster cell cycle progression and increased cell proliferation. Together, in contrast to the known deleterious effects of ATP6AP2 depletion, a moderate over-expression results in moderate behavioural changes and affects cell proliferation rate in vitro.

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Acknowledgements

The study was supported by the “Deutsche Forschungsgemeinschaft” (DFG; Grant Numbers: BO1971/6-1; INST 292/119-1 FUGG; INST 292/120-1, PE366/12-1, FUGG, We1688-17-1 and SFB 1192) and the EU (EFRE; UHGWM21).

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Correspondence to O. von Bohlen und Halbach.

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The work described has not been published before and is not under consideration for publication elsewhere. The manuscript has been approved by all co-authors and all contributors agreed with a submission of the manuscript to the journal “Brain Structure Function”.

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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.

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This article does not contain any studies with human participants performed by any of the authors.

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Bracke, A., Schäfer, S., von Bohlen und Halbach, V. et al. ATP6AP2 over-expression causes morphological alterations in the hippocampus and in hippocampus-related behaviour. Brain Struct Funct 223, 2287–2302 (2018). https://doi.org/10.1007/s00429-018-1633-1

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  • DOI: https://doi.org/10.1007/s00429-018-1633-1

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