The effects of microRNAs on glucocorticoid responsiveness.

PURPOSE

Glucocorticoids (GCs) are of wide usage in the clinical treatment of lymphoblastic malignancies such as acute lymphoblastic leukemia. However, individually distinctive responsiveness to the GC therapy may attenuate their clinical efficacy, and more reliable predictor for GC resistance is still eagerly needed. Recent studies indicate that microRNAs (miRNAs), which demonstrate regulatory functions targeting mRNAs during the post-transcription, involved in the regulation of GCs sensitivity through several mechanisms, especially adjusting the magnitude of GC receptors (GRs), which mediates the cellular effects of GCs and plays a pivotal role in GCs sensitivity, inspiring that special miRNAs pattern could serve as the biomarkers to predict GC sensitivity and bring forth potential strategies for overcoming drug resistance. In this review, we discuss related miRNAs and their diverse effects exerted on multifaceted complexity of GCs responsiveness for further exploiting the molecular mechanism of GC resistance and future construction of the molecular diagnostic method and reverse GC resistance.

METHODS

We have reviewed and searched for eligible literature relating to the effects of microRNAs on GC responsiveness from systematic PubMed searches.

RESULTS

GC response can be mediated by miRNAs through influence on GC signaling pathway, leading to diverse glucocorticoid responsiveness. Mutations in miRNA gene also influence GC response. As well, GCs regulate the function of several miRNAs, and suggesting a bidirectional influence among them.

CONCLUSIONS

It is possible and necessary that miRNAs serve as stable biomarkers and GC resistant patients would benefit from an effective and early screening test.