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Background

Breast carcinoma-amplified sequence 2 (BCAS2) regulates β-catenin gene splicing. The conditional knockout of BCAS2 expression in the forebrain (BCAS2 cKO) of mice confers impaired learning and memory along with decreased β-catenin expression. Because β-catenin reportedly regulates adult neurogenesis, we wondered whether BCAS2 could regulate adult neurogenesis via β-catenin.

Methods

BCAS2-regulating neurogenesis was investigated by characterizing BCAS2 cKO mice. Also, lentivirus-shBCAS2 was intracranially injected into the hippocampus of wild-type mice to knock down BCAS2 expression. We evaluated the rescue effects of BCAS2 cKO by intracranial injection of adeno-associated virus encoding BCAS2 (AAV-DJ8-BCAS2) and AAV-β-catenin gene therapy.

Results

To show that BCAS2-regulating adult neurogenesis via β-catenin, first, BCAS2 cKO mice showed low SRY-box 2-positive (Sox2+) neural stem cell proliferation and doublecortin-positive (DCX+) immature neurons. Second, stereotaxic intracranial injection of lentivirus-shBCAS2 knocked down BCAS2 in the hippocampus of wild-type mice, and we confirmed the BCAS2 regulation of adult neurogenesis via β-catenin. Third, AAV-DJ8-BCAS2 gene therapy in BCAS2 cKO mice reversed the low proliferation of Sox2+ neural stem cells and the decreased number of DCX+ immature neurons with increased β-catenin expression. Moreover, AAV-β-catenin gene therapy restored neuron stem cell proliferation and immature neuron differentiation, which further supports BCAS2-regulating adult neurogenesis via β-catenin. In addition, cells targeted by AAV-DJ8 injection into the hippocampus included Sox2 and DCX immature neurons, interneurons, and astrocytes. BCAS2 may regulate adult neurogenesis by targeting Sox2+ and DCX+ immature neurons for autocrine effects and interneurons or astrocytes for paracrine effects.

Conclusions

BCAS2 can regulate adult neurogenesis in mice via β-catenin."xsd:string
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http://purl.uniprot.org/citations/35410459http://purl.uniprot.org/core/author"Chen H.H."xsd:string
http://purl.uniprot.org/citations/35410459http://purl.uniprot.org/core/author"Lin S.H."xsd:string
http://purl.uniprot.org/citations/35410459http://purl.uniprot.org/core/author"Tsao Y.P."xsd:string
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http://purl.uniprot.org/citations/35410459http://purl.uniprot.org/core/author"Huang C.W."xsd:string
http://purl.uniprot.org/citations/35410459http://purl.uniprot.org/core/author"Lu H.Y."xsd:string
http://purl.uniprot.org/citations/35410459http://purl.uniprot.org/core/author"Wei P.H."xsd:string
http://purl.uniprot.org/citations/35410459http://purl.uniprot.org/core/date"2022"xsd:gYear
http://purl.uniprot.org/citations/35410459http://purl.uniprot.org/core/name"Stem Cell Res Ther"xsd:string
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http://purl.uniprot.org/citations/35410459http://purl.uniprot.org/core/title"Breast carcinoma-amplified sequence 2 regulates adult neurogenesis via beta-catenin."xsd:string
http://purl.uniprot.org/citations/35410459http://purl.uniprot.org/core/volume"13"xsd:string
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