Bradykinin B2 receptor is essential to running-induced cell proliferation in the adult mouse hippocampus

Author(s)

Wasinski, Frederick ^{[1, 2, 3]} ; Batista, Rogerio Oliveira ^{[2, 3]} ; Bader, Michael ^{[4, 3, 5]} ; Araujo, Ronaldo C. ^[2] ; Klempin, Friederike ^{[3, 6]}

Affiliation

^[1] Univ Sao Paulo, Inst Biomed Sci, Dept Physiol & Biophys, Sao Paulo - Brazil

^[2] Univ Fed Sao Paulo, Dept Biophys, Sao Paulo - Brazil

^[3] Max Delbruck Ctr Mol Med, Robert Roessle Str 10, D-13125 Berlin - Germany

^[4] Charite Univ Med Berlin, Berlin - Germany

^[5] Univ Lubeck, Inst Biol, Lubeck - Germany

^[6] Charite Univ Med Berlin, Dept Neurol, Berlin - Germany

• Document type: Journal article
• Source: Brain Structure & Function; v. 223, n. 8, p. 3901-3907, NOV 2018.
• Web of Science Citations: 2

Abstract

Physical exercise is a strong external effector that induces precursor cell proliferation in the adult mouse hippocampus. Research into mechanisms has focused on central changes within the hippocampus and we have established that serotonin is the signaling factor that transduces physical activity into adult neurogenesis. Less focus has been given on potential peripheral signals that may cause pro-mitotic running effects. Vasoactive kinin peptides are important for blood pressure regulation and inflammatory processes to maintain cardiovascular homeostasis. Acting via the two receptors termed B1 (B1R) and B2R, the peptides also function in the brain. In particular, studies attribute B2R a role in cell proliferation and differentiation into neurons in vitro. Here, we determined B1R and B2R mRNA expression levels in the adult mouse hippocampus and prefrontal cortex in vivo, and in response to running exercise. Using mice depleted in either or both receptors, B1-knockout (KO), B2KO and B1/2KO we observed changes in running performance overnight and in running distances. However, voluntary exercise led to the known pro-mitotic effect in the dentate gyrus of B1KO mice while it was attenuated in B2KO accompanied by an increase in microglia cells. Our data identify B2R as an important factor in running-induced precursor cell proliferation. (AU)

• FAPESP's process: 15/20082-7 - Kallikrein kinin system in physical exercise and metabolism
• Grantee: Ronaldo de Carvalho Araújo
• Support Opportunities: Research Projects - Thematic Grants