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Original Investigation

Iron supplementation improves skeletal muscle contractile properties in mice with CKD

Brent A. Momb, Edwin Patino, Oleh M. Akchurin and Mark S. Miller
Kidney360 March 2022, 10.34067/KID.0004412021; DOI: https://doi.org/10.34067/KID.0004412021
Brent A. Momb
1University of Massachusetts Amherst - Kinesiology, United States
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  • For correspondence: bmomb@umass.edu
Edwin Patino
2Weill Cornell Medicine, United States
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Oleh M. Akchurin
3Pediatrics, Weill Cornell Medicine, United States
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Mark S. Miller
4Kinesiology, University of Massachusetts, United States
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Key Points

  • CKD in mice decreased single skeletal muscle fiber force production independent of fiber size.

  • Iron supplementation in CKD mice improved aspects of contractile function, indicating CKD myopathy was partially mediated by iron imbalance.

  • Our findings in mice suggest that timely correction of iron imbalance and anemia may improve muscle fiber function in patients with CKD.

Abstract

Background: Chronic kidney disease (CKD) patients frequently have compromised physical performance, which increases their mortality; however, their skeletal muscle dysfunction has not been characterized at the single fiber and molecular levels. Notably, interventions to mitigate CKD myopathy are scarce. Methods: The impact of CKD in the absence and presence of iron supplementation on the contractile function of individual skeletal muscle fibers from the soleus and extensor digitorum longus muscles was evaluated in 16 week old mice. CKD was induced by adenine diet and iron supplementation was by weekly iron dextran injections. Results: Maximally activated and fatigued fiber force production was decreased 24-52% in untreated CKD, independent of size, by reducing strongly-bound myosin-actin cross-bridges and/or decreasing myofilament stiffness in myosin heavy chain (MHC) I, IIA and IIB fibers. Additionally, myosin-actin interactions in untreated CKD were slower for MHC I and IIA fibers and unchanged or faster in MHC IIB fibers. Iron supplementation improved anemia and did not change overall muscle mass in CKD mice. Iron supplementation ameliorated CKD-induced myopathy by increasing strongly-bound cross-bridges, leading to improved specific tension, and/or returning the rate of myosin-actin interactions towards or equivalent to control values in MHC IIA and IIB fibers. Conclusions: Skeletal muscle force production was significantly reduced in untreated CKD, independent of fiber size, indicating that compromised physical function in patients is not solely due to muscle mass loss. Iron supplementation improved multiple aspects of CKD-induced myopathy, suggesting that timely correction of iron imbalance may aid in ameliorating contractile deficits in CKD patients.

  • Mice
  • iron
  • frailty
  • physical function
  • chronic kidney disease
  • kidney
  • myosin
  • Basic Science
  • Received July 2, 2021.
  • Revision received March 18, 2022.
  • Accepted March 18, 2022.
  • Copyright © 2022 American Society of Nephrology
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Kidney360: 3 (4)
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Vol. 3, Issue 4
28 Apr 2022
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Iron supplementation and skeletal muscle in CKD
Brent A. Momb, Edwin Patino, Oleh M. Akchurin, Mark S. Miller
Kidney360 Mar 2022, 10.34067/KID.0004412021; DOI: 10.34067/KID.0004412021

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Iron supplementation and skeletal muscle in CKD
Brent A. Momb, Edwin Patino, Oleh M. Akchurin, Mark S. Miller
Kidney360 Mar 2022, 10.34067/KID.0004412021; DOI: 10.34067/KID.0004412021
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Keywords

  • mice
  • iron
  • frailty
  • physical function
  • chronic kidney disease
  • kidney
  • myosin
  • Basic Science

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