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Chronic bacterial prostatitis (CBP) is an intractable disease. Although bone marrow mesenchymal stem cells (BMMSCs) are able to regulate inflammation in CBP, the effect of microbubble-mediated ultrasound- induced accumulation of BMMSCs on CBP remains unclear. To address this gap, a model of CBP was established in SD rats, which were then treated with BMMSCs alone (BMMSC group), BMMSCs with ultrasound (ultrasound group), BMMSCs with microbubble-mediated ultrasound (MMUS group) and compared with a healthy control group. A therapeutic-ultrasound apparatus was used to treat the prostate in the presence of circulating microbubbles and BMMSCs. The BMMSC distribution was assessed with  in vivo  imaging, and the prostate structure with light microscopy. Real-time quantitative RT-PCR, ELISA, and immunohistochemistry were used to assess the expressions of TNF-α and IL-1β. More BMMSCs were found in the prostate in the MMUS group than in the CBP, ultrasound, and BMMSC groups. Inflammatory cell infiltration, fibrous tissue hyperplasia, and tumor-like epithelial proliferation were significantly reduced in the MMUS group, as were the mRNA and protein expressions of TNF-α and IL-1β. Microbubble-mediated ultrasound-induced accumulation of BMMSCs can inhibit inflammation and decrease TNF-α and IL-1β expressions in the prostate of CBP rats, suggesting that this method may be therapeutic for CPB.

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Microbubble-mediated ultrasound promotes accumulation of bone marrow mesenchymal stem cell to the prostate for treating chronic bacterial prostatitis in rats