title: Pathobiology and management of prostate cancer-induced bone pain: recent insights and future treatments.
abstract: Prostate cancer (PCa) has a high propensity for metastasis to bone. Despite the availability of multiple treatment options for relief of PCa-induced bone pain (PCIBP), satisfactory relief of intractable pain in patients with advanced bony metastases is challenging for the clinicians because currently available analgesic drugs are often limited by poor efficacy and/or dose-limiting side effects. Rodent models developed in the past decade show that the pathobiology of PCIBP comprises elements of inflammatory, neuropathic and ischemic pain arising from ectopic sprouting and sensitization of sensory nerve fibres within PCa-invaded bones. In addition, at the cellular level, PCIBP is underpinned by dynamic cross talk between metastatic PCa cells, cellular components of the bone matrix, factors associated with the bone microenvironment as well as peripheral components of the somatosensory system. These insights are aligned with the clinical management of PCIBP involving use of a multimodal treatment approach comprising analgesic agents (opioids, NSAIDs), radiotherapy, radioisotopes, cancer chemotherapy agents and bisphosphonates. However, a major drawback of most rodent models of PCIBP is their short-term applicability due to ethical concerns. Thus, it has been difficult to gain insight into the mal(adaptive) neuroplastic changes occurring at multiple levels of the somatosensory system that likely contribute to intractable pain at the advanced stages of metastatic disease. Specifically, the functional responsiveness of noxious circuitry as well as the neurochemical signature of a broad array of pro-hyperalgesic mediators in the dorsal root ganglia and spinal cord of rodent models of PCIBP is relatively poorly characterized. Hence, recent work from our laboratory to develop a protocol for an optimized rat model of PCIBP will enable these knowledge gaps to be addressed as well as identification of novel targets for drug discovery programs aimed at producing new analgesics for the improved relief of intractable PCIBP.
authors.affiliation: Centre for Integrated Preclinical Drug Development, The University of Queensland, Level 3, Steele Building, St Lucia Campus, Brisbane, QLD, 4072, Australia.
authors.forename: Arjun
authors.initials: A
authors.lastname: Muralidharan
authors.forename: Maree T
authors.initials: MT
authors.lastname: Smith
mesh_terms: D000277:Adjuvants, Pharmaceutic / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use; D000701:Analgesics, Opioid / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use; D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use; D001859:Bone Neoplasms / Q000556:secondary*; D001842:Bone and Bones / Q000187:drug effects / Q000473:pathology* / Q000528:radiation effects; D003131:Combined Modality Therapy; D004195:Disease Models, Animal; D004359:Drug Therapy, Combination; D006801:Humans; D008297:Male; D059226:Nociceptive Pain / Q000188:drug therapy* / Q000209:etiology / Q000532:radiotherapy; D059408:Pain Management / Q000379:methods* / Q000639:trends; D011471:Prostatic Neoplasms / Q000473:pathology*
chemical_list: D000277:Adjuvants, Pharmaceutic; D000701:Analgesics, Opioid; D000894:Anti-Inflammatory Agents, Non-Steroidal
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