Nrf2 deficiency promotes apoptosis and impairs PAX7/MyoD expression in aging skeletal muscle cells

Madhusudhanan Narasimhan, Jennifer Hong, Nancy Atieno, Vasanthi R. Muthusamy, Christopher J. Davidson, Naser Abu-Rmaileh, Russell S. Richardson, Aldrin V Gomes, John R. Hoidal, Namakkal S. Rajasekaran

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Abstract

Skeletal muscle redox homeostasis is transcriptionally regulated by nuclear erythroid-2-p45-related factor-2 (Nrf2). We recently demonstrated that age-associated stress impairs Nrf2-ARE (antioxidant-response element) transcriptional signaling. Here, we hypothesize that age-dependent decline or genetic ablation of Nrf2 leads to accelerated apoptosis and skeletal muscle degeneration. Under basal-physiological conditions, disruption of Nrf2 significantly downregulates antioxidants and causes oxidative stress. Surprisingly, Nrf2-null mice had enhanced antioxidant capacity identical to wild-type (WT) upon acute endurance exercise stress (AEES), suggesting activation of Nrf2-independent mechanisms (i.e., PGC1α) against oxidative stress. Analysis of prosurvival pathways in the basal state reveals decreased AKT levels, whereas p-p53, a repressor of AKT, was increased in Nrf2-null vs WT mice. Upon AEES, AKT and p-AKT levels were significantly (p < 0.001) increased (>10-fold) along with profound downregulation of p-p53 (p < 0.01) in Nrf2-null vs WT skeletal muscle, indicating the onset of prosurvival mechanisms to compensate for the loss of Nrf2 signaling. However, we found a decreased stem cell population (PAX7) and MyoD expression (differentiation) along with profound activation of ubiquitin and apoptotic pathways in Nrf2-null vs WT mice upon AEES, suggesting that compensatory prosurvival mechanisms failed to overcome the programmed cell death and degeneration in skeletal muscle. Further, the impaired regeneration was sustained in Nrf2-null vs WT mice after 1 week of post-AEES recovery. In an age-associated oxidative stress condition, ablation of Nrf2 results in induction of apoptosis and impaired muscle regeneration.

Original languageEnglish (US)
Pages (from-to)402-414
Number of pages13
JournalFree Radical Biology and Medicine
Volume71
DOIs
StatePublished - 2014

Fingerprint

Muscle Cells
Muscle
Skeletal Muscle
Aging of materials
Cells
Oxidative stress
Exercise
Apoptosis
Durability
Oxidative Stress
Regeneration
Ablation
Down-Regulation
Antioxidants
Antioxidant Response Elements
Chemical activation
Ubiquitin
Oxidation-Reduction
Cell death
Stem cells

Keywords

  • Aging
  • Free radicals
  • Nrf2
  • PAX7/MyoD
  • Skeletal muscle
  • Stem cells

ASJC Scopus subject areas

  • Biochemistry
  • Physiology (medical)

Cite this

Narasimhan, M., Hong, J., Atieno, N., Muthusamy, V. R., Davidson, C. J., Abu-Rmaileh, N., ... Rajasekaran, N. S. (2014). Nrf2 deficiency promotes apoptosis and impairs PAX7/MyoD expression in aging skeletal muscle cells. Free Radical Biology and Medicine, 71, 402-414. https://doi.org/10.1016/j.freeradbiomed.2014.02.023

Nrf2 deficiency promotes apoptosis and impairs PAX7/MyoD expression in aging skeletal muscle cells. / Narasimhan, Madhusudhanan; Hong, Jennifer; Atieno, Nancy; Muthusamy, Vasanthi R.; Davidson, Christopher J.; Abu-Rmaileh, Naser; Richardson, Russell S.; Gomes, Aldrin V; Hoidal, John R.; Rajasekaran, Namakkal S.

In: Free Radical Biology and Medicine, Vol. 71, 2014, p. 402-414.

Research output: Contribution to journalArticle

Narasimhan, M, Hong, J, Atieno, N, Muthusamy, VR, Davidson, CJ, Abu-Rmaileh, N, Richardson, RS, Gomes, AV, Hoidal, JR & Rajasekaran, NS 2014, 'Nrf2 deficiency promotes apoptosis and impairs PAX7/MyoD expression in aging skeletal muscle cells', Free Radical Biology and Medicine, vol. 71, pp. 402-414. https://doi.org/10.1016/j.freeradbiomed.2014.02.023
Narasimhan, Madhusudhanan ; Hong, Jennifer ; Atieno, Nancy ; Muthusamy, Vasanthi R. ; Davidson, Christopher J. ; Abu-Rmaileh, Naser ; Richardson, Russell S. ; Gomes, Aldrin V ; Hoidal, John R. ; Rajasekaran, Namakkal S. / Nrf2 deficiency promotes apoptosis and impairs PAX7/MyoD expression in aging skeletal muscle cells. In: Free Radical Biology and Medicine. 2014 ; Vol. 71. pp. 402-414.
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AU - Muthusamy, Vasanthi R.

AU - Davidson, Christopher J.

AU - Abu-Rmaileh, Naser

AU - Richardson, Russell S.

AU - Gomes, Aldrin V

AU - Hoidal, John R.

AU - Rajasekaran, Namakkal S.

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