Effect of a high-intensity interval training on serum microRNA levels in women with breast cancer undergoing hormone therapy. A single-blind randomized trial - 20/09/19
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Highlights |
• | The identification of the expression pattern of microRNAs (miRs) characterizing exercise training may be useful for monitoring patients with breast cancer undergoing hormone therapy. |
• | Hormone therapy in women with breast cancer could considerably downregulate cancer-related miRs (oncomiRs) and upregulate tumor suppressor miRs (TSmiRs). |
• | Interval exercise training for 12weeks with hormone therapy could further decrease the expression of oncomiRs and further increase that of tumor suppressor miRs than with hormone therapy alone. |
• | Serum levels of cancer-associated miRs could be attractive biomarker candidates in the physical performance capacity and training adaptation in women undergoing hormone therapy. |
Abstract |
Background |
The role of microRNAs (miRs) in hormone therapy (HT) is of keen interest in developing biomarkers and treatments for individuals with breast cancer. Although miRs are often moderate regulators under homeostatic conditions, their function is changed more in response to physical activity.
Objective |
This single-blind randomized trial aimed to explore the effect of high-intensity interval training (HIIT) on serum levels of miRs in individuals with early-stage breast cancer undergoing HT.
Methods |
Hormone receptor-positive women with breast cancer and healthy women were randomly assigned to a healthy control group (n=15), healthy group with HIIT (n=15), breast cancer group with HT (HT, n=26), and breast cancer group with HT and HIIT (HT+HIIT, n=26). The exercise groups underwent interval uphill walking training on a treadmill 3 times a week for 12weeks. At the end of the study, we analyzed changes in levels of cancer-related miRs (oncomiRs) and tumour suppressor miRs (TSmiRs) in response to the HT and HIIT.
Results |
In women with breast cancer versus healthy controls, the expression of some oncomiRs was significantly increased — miR-21 (P<0.001), miR-155 (P=0.001), miR-221 (P=0.008), miR-27a (P<0.001), and miR-10b (P=0.007) — and that of some TSmiRs was significantly decreased — miR-206 (P=0.048), miR-145 (P=0.011), miR-143 (P=0.008), miR-9 (P=0.020), and let-7a (P=0.005). Moreover, HT considerably downregulated oncomiRs and upregulated TSmiRs. HIIT for 12weeks with HT significantly decreased the expression of the oncomiRs and significantly increased that of the TSmiRs as compared with HT alone.
Conclusions |
HITT could amplify the decrease and/or increase in expression of miRs associated with HT in women with breast cancer. A prospective trial could determine whether the use of circulating miRs for monitoring treatment can be useful in therapy decisions.
Trial registration |
Iranian Registry of Clinical Trials (No.: IRCT201202289171N1).
El texto completo de este artículo está disponible en PDF.Keywords : microRNAs, Breast cancer, Hormone therapy, Training
Esquema
Vol 62 - N° 5
P. 329-335 - septembre 2019 Regresar al número
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Bienvenido a EM-consulte, la referencia de los profesionales de la salud.