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Seibert TA, Shi L, Althouse S, Hoffman R, Schneider BP, Russ KA, Altherr CA, Warden SJ, Guise TA, Coggan AR, Ballinger TJ. Molecular and clinical effects of aromatase inhibitor therapy on skeletal muscle function in early-stage breast cancer. Sci Rep 2024; 14:1029. [PMID: 38200207 PMCID: PMC10781701 DOI: 10.1038/s41598-024-51751-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Accepted: 01/09/2024] [Indexed: 01/12/2024] Open
Abstract
We evaluated biochemical changes in skeletal muscle of women with breast cancer initiating aromatase inhibitors (AI), including oxidation of ryanodine receptor RyR1 and loss of stabilizing protein calstabin1, and detailed measures of muscle function. Fifteen postmenopausal women with stage I-III breast cancer planning to initiate AI enrolled. Quadriceps muscle biopsy, dual-energy x-ray absorptiometry, isokinetic dynamometry, Short Physical Performance Battery, grip strength, 6-min walk, patient-reported outcomes, and serologic measures of bone turnover were assessed before and after 6 months of AI. Post-AI exposure, oxidation of RyR1 significantly increased (0.23 ± 0.37 vs. 0.88 ± 0.80, p < 0.001) and RyR1-bound calstabin1 significantly decreased (1.69 ± 1.53 vs. 0.74 ± 0.85, p < 0.001), consistent with dysfunctional calcium channels in skeletal muscle. Grip strength significantly decreased at 6 months. No significant differences were seen in isokinetic dynamometry measures of muscle contractility, fatigue resistance, or muscle recovery post-AI exposure. However, there was significant correlation between oxidation of RyR1 with muscle power (r = 0.60, p = 0.02) and muscle fatigue (r = 0.57, p = 0.03). Estrogen deprivation therapy for breast cancer resulted in maladaptive changes in skeletal muscle, consistent with the biochemical signature of dysfunctional RyR1 calcium channels. Future studies will evaluate longer trajectories of muscle function change and include other high bone turnover states, such as bone metastases.
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Affiliation(s)
- Tara A Seibert
- Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Lei Shi
- Department of Endocrine Neoplasia and Hormonal Disorders, MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Sandra Althouse
- Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Richard Hoffman
- Department of Kinesiology, Indiana University School of Health & Human Sciences, Indianapolis, IN, 46202, USA
| | - Bryan P Schneider
- Division of Hematology/Oncology, Department of Medicine, Indiana University School of Medicine, 535 Barnhill Dr. RT 472, Indianapolis, IN, 46202, USA
| | - Kristen A Russ
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Cody A Altherr
- Indiana Center for Musculoskeletal Health, Clinical Research Center, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Stuart J Warden
- Department of Physical Therapy, Indiana University School of Health & Human Sciences, Indianapolis, IN, 46202, USA
| | - Theresa A Guise
- Department of Kinesiology, Indiana University School of Health & Human Sciences, Indianapolis, IN, 46202, USA
| | - Andrew R Coggan
- Department of Kinesiology, Indiana University School of Health & Human Sciences, Indianapolis, IN, 46202, USA
| | - Tarah J Ballinger
- Division of Hematology/Oncology, Department of Medicine, Indiana University School of Medicine, 535 Barnhill Dr. RT 472, Indianapolis, IN, 46202, USA.
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