MicroRNAs are short non-coding RNA molecules that control posttranscriptional gene expression and are present in tissues cells but also circulate in biological fluids in various forms (exosome, connected with proteins, apoptotic bodies, etc.). The roles that circulated extracellular serum microRNAs possess in cancer development, like in the delivery from a recipient cell to distant tissues and the repression of host genes resulting in the impairment of critical functions, are still undetermined. Disturbances, such as the higher incidence of atrial fibrillation in cancer patients, could be analyzed in the frame of suppressive action of circulated microRNAs in genes that control cardiac conduction in atrium. More precisely, mir-21 overexpression in tissues promotes atrium fibrosis and impairs conductibility. A possible hypothesis is that the high levels of circulating microRNA in cancer may exert the same effect. Further experiments are necessary to corroborate the hypothesis.
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