Low magnitude mechanical signals mitigate osteopenia without compromising longevity in an aged murine model of spontaneous granulosa cell ovarian cancer.

Bone
Gabriel M PagnottiClinton T Rubin

Abstract

Cancer progression is often paralleled by a decline in bone mass, raising risk of fracture. Concerns persist regarding anabolic interventions for skeletal protection, as these may inadvertently exacerbate neoplastic tissue expansion. Given bone's inherent mechanosensitivity, low intensity vibration (LIV), a mechanical signal that encourages osteoblastogenesis, could possibly slow cancer-associated bone loss, but this goal must be achieved without fostering disease progression. Seventy 12w female F1-SWRxSWXJ-9 mice, a strain prone to developing granulosa cell tumors, were randomized into baseline control (BC: n=10), age-matched control (AC: n=30), and LIV (n=30), which received mechanical signals (90Hz @ 0.3g) for 15m/day, 5 day/w over the course of 1 year. Survival curves for AC (10 died) and LIV (8 died) followed similar trends (p=0.62), indicating longevity was unperturbed by LIV. At 1 year, bone volume of proximal tibiae in LIV mice was 25% greater than AC (p<0.02), while bone volume of L5 vertebrae was 16% higher in LIV over AC (p<0.02). Primary lesions and peripheral metastases were apparent in both LIV and AC; however, overall tumor incidence was approximately 30% less in LIV (p=0.27) and, when disease was evident, involv...Continue Reading

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Citations

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