Remodeling of myelinated fibers and internal capillaries in distal peripheral nerves following aerobic exercise in aged rats

Masahiro Sakita, Shinichiro Murakami, Hidemi Fujino, Satoshi Hayashi, Kazuyoshi Kameyama, Takafumi Saito, Shuzo Kumagai

Research output: Contribution to journalArticle

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Abstract

The aim of this study was to determine whether aerobic exercise (AE) in old age contributes to improving the morphologies of myelinated fibers (MFs) in peripheral nerves as well as capillaries. Furthermore, we investigated whether such processes are associated wit.complementary activity of brain-derived neurotrophic factor (BDNF) and vascular endothelial growth factor (VEGF) in the circulating blood and peripheral nerve tissue. Fourteen male Wistar rats (age: 95 wk) were randomly divided into moderate AE (n = 8) and sedentary (SED; n = 6) groups. Rats in the AE group performed treadmill running for 1 h per day for 2 wk, following which the bilateral tibial nerves of the two groups were removed to examine MF and capillary structure. Levels of BDNF and VEGF in the serum and peripheral nerves were analyzed via enzyme-linked immunosorbent assay. Myelin thickness, axon diameter, and capillary luminal diameter were significantly larger in the AE group than in the SED group (P < 0.0001). Levels of serum BDNF and VEGF were significantly lower and higher, respectively, in the AE group than in the SED group (P < 0.001). Conversely, BDNF and VEGF levels in tibial nerve tissue were significantly higher, respectively, and lower in the AE group than in the SED group (P < 0.001). In conclusion, our study indicates that regular AE induces enlargement of the capillaries and thickens the myelin in aged peripheral nerves, likely via .complementary process involving BDNF and VEGF. NEW & NOTEWORTHY Accumulating evidence indicates that age-related sarcopenia is accompanied by the degeneration of myelinated fibers (MFs) in peripheral nerves. Our study indicates that regular aerobic exercise contributes to increased thickness of the myelin surrounding MFs and enlargement of the capillaries, likely via .complementary process involving brain-derived neurotrophic factor and vascular endothelial growth factor. Our findings demonstrate that regular, moderate-intensity aerobic exercise may help to prevent and reverse peripheral nerve regression in older adults.

Original languageEnglish
Pages (from-to)1051-1061
Number of pages11
JournalJournal of Applied Physiology
Volume125
Issue number4
DOIs
Publication statusPublished - Oct 1 2018

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Peripheral Nerves
Brain-Derived Neurotrophic Factor
Exercise
Vascular Endothelial Growth Factor A
Myelin Sheath
Nerve Tissue
Tibial Nerve
Sarcopenia
Wit and Humor
Serum
Running
Axons
Wistar Rats
Enzyme-Linked Immunosorbent Assay

All Science Journal Classification (ASJC) codes

  • Physiology
  • Physiology (medical)

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Remodeling of myelinated fibers and internal capillaries in distal peripheral nerves following aerobic exercise in aged rats. / Sakita, Masahiro; Murakami, Shinichiro; Fujino, Hidemi; Hayashi, Satoshi; Kameyama, Kazuyoshi; Saito, Takafumi; Kumagai, Shuzo.

In: Journal of Applied Physiology, Vol. 125, No. 4, 01.10.2018, p. 1051-1061.

Research output: Contribution to journalArticle

Sakita, Masahiro ; Murakami, Shinichiro ; Fujino, Hidemi ; Hayashi, Satoshi ; Kameyama, Kazuyoshi ; Saito, Takafumi ; Kumagai, Shuzo. / Remodeling of myelinated fibers and internal capillaries in distal peripheral nerves following aerobic exercise in aged rats. In: Journal of Applied Physiology. 2018 ; Vol. 125, No. 4. pp. 1051-1061.
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