期刊
JOURNAL OF PHYSIOLOGY-LONDON
卷 595, 期 17, 页码 5931-5943出版社
WILEY
DOI: 10.1113/JP273994
关键词
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资金
- NIH/NHLBI [1 P01 HL091830-01A1]
- American Heart Association [AHA 13UFEL16580031]
Exercise signals neurogenesis in the dentate gyrus of the hippocampus. This phenomenon requires vascular endothelial growth factor (VEGF) originating from outside the blood-brain barrier, but no cellular source has been identified. Thus, we hypothesized that VEGF produced by skeletal myofibers plays a role in regulating hippocampal neuronal precursor cell proliferation following exercise training. This was tested in adult conditional skeletalmyofiber-specific VEGF gene-ablated mice (VEGF(HSA-/-)) by providing VEGFHSA(-/-) and non-ablated (VEGF(f/f)) littermates with running wheels for 14 days. Following this training period, hippocampal cerebral blood flow (CBF) was measured by functional magnetic resonance imaging (fMRI), and neuronal precursor cells (BrdU+/Nestin+) were detected by immunofluorescence. The VEGF(f/f) trained group showed improvements in both speed and endurance capacity in acute treadmill running tests (P < 0.05). The VEGF(HSA-/-) group did not. The number of proliferating neuronal precursor cells was increased with training in VEGF(f/f) (P < 0.05) but not in VEGF(HSA-/-) mice. Endothelial cell (CD31+) number did not change in this region with exercise training or skeletal myofiber VEGF gene deletion. However, resting blood flow through the hippocampal region was lower in VEGF(HSA-/-) mice, both untrained and trained, than untrained VEGF(f/f) mice (P < 0.05). An acute hypoxic challenge decreased CBF (P < 0.05) in untrained VEGF(f/f), untrained VEGF(HSA-/-) and trained VEGF(HSA-/-) mice, but not trained VEGF(f/f) mice. VEGF(f/f), but not VEGF(HSA-/-), mice were able to acutely run on a treadmill at an intensity sufficient to increase hippocampus VEGF levels. These data suggest that VEGF expressed by skeletal myofibers may directly or indirectly regulate both hippocampal blood flow and neurogenesis.
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