Intraprostatic injection of exosomes isolated from adipose-derived mesenchymal stem cells for the treatment of chronic non-bacterial prostatitis.

Mesenchymal stem cells (MSCs) own the capacity to secrete trophic factors as exosomes which play significant roles in regulating the functions of other cells and preventing inflammation. Due to the inflammatory process in chronic non-bacterial prostatitis (CNP) and the ambiguity in the treatment of this disease, the present study was aimed to investigate the therapeutic use of adipose-derived MSC exosomes in an animal model of CNP. MSCs were first isolated from rat subcutaneous adipose tissue, and exosomes were extracted from them. Specific features of exosomes were characterized by a scanning electron microscope, western blot technique, and Dynamic Light Scattering methods. To establish CNP in rats, intraprostatic injection of Freund's complete adjuvant was done. After confirmation of prostatitis, intraprostatic injections of exosomes were performed for treatment. Histological evaluation revealed that treatment with exosomes resulted in a relative improvement of lesions caused by CNP. The expression of p-NF-κB and p-IκBα proteins along with inflammatory markers was significantly increased in the CNP group, which treatment with exosomes significantly reduced their expression as well as IL-1β and TNF-α proteins. The antioxidant effects of exosomes were also determined by significantly regulating glutathione peroxidase and superoxide dismutase activity and malondialdehyde levels in these animals. Our results cautiously suggest the therapeutic effects of MSC-derived exosomes against CNP-induced prostatitis through their antioxidant and anti-inflammatory activities, which should be further considered in the future.