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The etiology of chronic prostatitis/chronic pelvic pain syndrome (CP/CPPS) is still unknown. Granulocyte macrophage colony-stimulating factor (GM-CSF) has been shown to play an important role in the development of autoimmune and inflammatory diseases. Here, we investigated the expression and function of GM-CSF in patients with CP/CPPS and in a mouse model of experimental autoimmune prostatitis (EAP). GM-CSF mRNA levels were detected in expressed prostatic secretions samples from patients with CP/CPPS and in prostate tissue from a mouse model of EAP. The expression of GM-CSF receptor in mouse prostate and dorsal root ganglia were determined using PCR and immunohistochemistry. Behavioral testing and inflammation scoring were performed to evaluate the role of GM-CSF in disease development and symptom severity of EAP using GM-CSF knockout mice. mRNA levels of putative nociceptive and inflammatory markers were measured in the prostate after the induction of EAP. Elevated GM-CSF mRNA levels were observed in expressed prostatic secretions samples from patients with CP/CPPS compared with healthy volunteers. GM-CSF mRNA was also significantly increased in prostate tissue of the EAP mice model. The expression of GM-CSF receptors was confirmed in mouse prostate and dorsal root ganglia. GM-CSF knockout mice showed fewer Infiltrating leukocytes and pain symptoms after the induction of EAP. Deletion of GM-CSF significantly diminished EAP-induced increases of chemokine (C-C motif) ligand 2, chemokine (C-C motif) ligand 3, and nerve growth factor mRNA expression. The results indicated that GM-CSF plays a functional role in the pathogenesis of EAP. GM-CSF may function as a signaling mediator for both inflammation and pain transduction in CP/CPPS.

Role of GM-CSF in a mouse model of experimental autoimmune prostatitis