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Identification of microRNAome in rat bladder reveals miR-1949 as a potential inducer of bladder cancer following spinal cord injury

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The costs of spinal cord injury and its complications are high in personal, social and financial terms. Complications include bladder cancer, for which the risk is 1628 times higher than that of the general population, There is currently little consensus regarding the cause of this discrepancy. As microRNAs are stable biomarkers and potential therapeutic targets of cancer, the present study aimed to explore the underlying mechanisms of this phenomenon by examining changes in the microRNAome. Rats were used to produce models of spinal cord injury. Microarrays and bioinformatics were used to investigate the cancerassociated microRNAs that are upregulated in rat bladders following spinal cord injury. In order to validate the results, quantitative reverse transcriptionpolymerase chain reaction (qRTPCR), western blotting and immunohistochemistry were performed. The expression of miR1949 was found to be deregulated and abundant in the rat bladder following spinal cord injury. Bioinformatics demonstrated that retinoblastoma 1, which is involved in tumorigenesis, is a target gene of miR1949. qRTPCR, western blotting and immunohistochemistry confirmed the results of the microarray analysis. In addition, it was shown that miR1949 expression was not influenced by aging. Furthermore, the expression of miR1949 was stable until the third month following spinal cord injury, after which it significantly increased. If this increase was prolonged, the expression of retinoblastoma 1 may decline to a carcinogenic level. The present study suggests a role for miR1949 in the translational regulation of retinoblastoma 1 and in subsequent bladder tumorigenesis following spinal cord injury.
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Document Type: Research Article

Affiliations: 1: Department of Orthopedics, Tianjin Medical University General Hospital, Tianjin 300052, P.R. China 2: Department of Orthopedics, The Second Hospital of Tianjin Medical University, Tianjin 300211, P.R. China 3: Department of Paediatric Internal Medicine, Affiliated Hospital of Chengde Medical College, Chengde, Hebei 067000, P.R. China 4: 221 Laboratory, School of Medicine, Nankai University, Tianjin 300071, P.R. China

Publication date: August 1, 2015

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  • Molecular Medicine Reports is a monthly, peer-reviewed journal available in print and online, that includes studies devoted to molecular medicine, underscoring aspects including pharmacology, pathology, genetics, neurosciences, infectious diseases, molecular cardiology and molecular surgery. In vitro and in vivo studies of experimental model systems pertaining to the mechanisms of a variety of diseases offer researchers the necessary tools and knowledge with which to aid the diagnosis and treatment of human diseases.
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