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Article

Voluntary Wheel Running Partially Compensates for the Effects of Global Estrogen Receptor-α Knockout on Cortical Bone in Young Male Mice

1
Nutrition and Exercise Physiology, University of Missouri, Columbia, MO 65211, USA
2
Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN 37203, USA
3
Department of Biochemistry, University of Missouri, Columbia, MO 65211, USA
4
Child Health, University of Missouri, Columbia, MO 65211, USA
5
Dalton Cardiovascular Research Center, University of Missouri, Columbia, MO 65211, USA
*
Author to whom correspondence should be addressed.
The author has nothing to disclose.
Academic Editor: Farzad Pakdel
Int. J. Mol. Sci. 2021, 22(4), 1734; https://doi.org/10.3390/ijms22041734
Received: 27 January 2021 / Revised: 3 February 2021 / Accepted: 5 February 2021 / Published: 9 February 2021
(This article belongs to the Special Issue The Role of Estrogen Receptors in Health and Disease)
Estrogen receptor-α knockout (ERKO) in female, but not male, mice results in an impaired osteogenic response to exercise, but the mechanisms behind this ability in males are unknown. We explored the main and interactive effects of ERKO and exercise on cortical geometry, trabecular microarchitecture, biomechanical strength, and sclerostin expression in male mice. At 12 weeks of age, male C57BL/6J ERKO and WT animals were randomized into two groups: exercise treatment (EX) and sedentary (SED) controls, until 22 weeks of age. Cortical geometry and trabecular microarchitecture were measured via μCT; biomechanical strength was assessed via three-point bending; sclerostin expression was measured via immunohistochemistry. Two-way ANOVA was used to assess sclerostin expression and trabecular microarchitecture; two-way ANCOVA with body weight was used to assess cortical geometry and biomechanical strength. ERKO positively impacted trabecular microarchitecture, and exercise had little effect on these outcomes. ERKO significantly impaired cortical geometry, but exercise was able to partially reverse these negative alterations. EX increased cortical thickness regardless of genotype. There were no effects of genotype or exercise on sclerostin expression. In conclusion, male ERKO mice retain the ability to build bone in response to exercise, but altering sclerostin expression is not one of the mechanisms involved. View Full-Text
Keywords: estrogen; estrogen receptors; exercise; sclerostin; bone health estrogen; estrogen receptors; exercise; sclerostin; bone health
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MDPI and ACS Style

Dirkes, R.K.; Winn, N.C.; Jurrissen, T.J.; Lubahn, D.B.; Vieira-Potter, V.J.; Padilla, J.; Hinton, P.S. Voluntary Wheel Running Partially Compensates for the Effects of Global Estrogen Receptor-α Knockout on Cortical Bone in Young Male Mice. Int. J. Mol. Sci. 2021, 22, 1734. https://doi.org/10.3390/ijms22041734

AMA Style

Dirkes RK, Winn NC, Jurrissen TJ, Lubahn DB, Vieira-Potter VJ, Padilla J, Hinton PS. Voluntary Wheel Running Partially Compensates for the Effects of Global Estrogen Receptor-α Knockout on Cortical Bone in Young Male Mice. International Journal of Molecular Sciences. 2021; 22(4):1734. https://doi.org/10.3390/ijms22041734

Chicago/Turabian Style

Dirkes, Rebecca K., Nathan C. Winn, Thomas J. Jurrissen, Dennis B. Lubahn, Victoria J. Vieira-Potter, Jaume Padilla, and Pamela S. Hinton 2021. "Voluntary Wheel Running Partially Compensates for the Effects of Global Estrogen Receptor-α Knockout on Cortical Bone in Young Male Mice" International Journal of Molecular Sciences 22, no. 4: 1734. https://doi.org/10.3390/ijms22041734

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