Shahed University

Oxytocin mediates the beneficial effects of the exercise training on breast cancer

Ali Mohammad Alizadeh | Zahra Heydari | Mostafa Rahimi | Behzad Bazgir | Hossein Shirvani | Sadaf Alipour | Yassaman Heidarian | Solmaz Khalighfard | Amin Isanejad

Date :  2017/12/26
Publish in :    Experimental Physiology
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Keywords :Oxytocin, exercise, training, cancer

Abstract :
Exercise training can affect the growth of breast tumours.We hypothesized that exercise training might reduce breast tumour growth by inducing oxytocin (OT) secretion and its related signalling pathways, such as PI3K/Akt and ERK. Therefore, 56 BALB/c mice were equally divided into seven groups to study the effects of OT and atosiban (an oxytocin receptor antagonist) together with interval exercise training on mammary tumour growth, as well as tumour-related signalling pathways, including PI3K/Akt and ERK. Animal weight, OT plasma concentration, tumour weight and volume were measured at the end of the study. PI3K/Akt and ERK were evaluated byWestern blot and qPCR assays. The results showed that OT plasma concentrationwas significantly increased in trained animals. The volume andweight of tumours were decreased significantly after both exercise training and OT administration. The expression of genes involved in tumour cell proliferation, such as PI3KR2, Akt andmTOR,was notably lower in the exercise-trained and OT-treated groups. Furthermore, the expression of genes involved in cell apoptosis, such as caspase-3 and Bax, was significantly increased in the tumour tissues. In addition, Western blot results showed that phosphorylated Akt and ERK were significantly decreased inthe exercise training andOTgroups comparedwith the tumour group. Interestingly, atosiban reversed these effects. These results indicated that interval exercise training, acting via OT secretion, may reduce PI3K/Akt and ERK axis activities, and consequently, decrease tumour volume and weight in a mouse model of breast cancer.