Upregulation of MiR-23a-27a-24-2 Cluster Induces Caspase-dependent and -independent Apoptosis in Human Embryonic Kidney Cells

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2009 Jun 11

PMID 19513126

Citations 73

Authors

Ravindresh Chhabra

Yogita K Adlakha

Manoj Hariharan

Vinod Scaria

Neeru Saini

Affiliations

Soon will be listed here.

Abstract

miRNAs have emerged as important players in the regulation of gene expression and their deregulation is a common feature in a variety of diseases, especially cancer. Currently, many efforts are focused on studying miRNA expression patterns, as well as miRNA target validation. Here, we show that the over expression of miR-23a approximately 27a approximately 24-2 cluster in HEK293T cells induces apoptosis by caspase-dependent as well as caspase-independent pathway as proved by the annexin assay, caspase activation, release of cytochrome-c and AIF (apoptosis inducing factor) from mitochondria. Furthermore, the over expressed cluster modulates the expression of a number of genes involved in apoptosis including FADD (Fas Associated protein with Death Domain). Bioinformatically, FADD is predicted to be the target of hsa-miR-27a and interestingly, FADD protein was found to be up regulated consistent with very less expression of hsa-miR-27a in HEK293T cells. This effect was direct, as hsa-miR-27a negatively regulated the expression of FADD 3'UTR based reporter construct. Moreover, we also showed that over expression of miR-23a approximately 27a approximately 24-2 sensitized HEK293T cells to TNF-alpha cytotoxicity. Taken together, our study demonstrates that enhanced TNF-alpha induced apoptosis in HEK293T cells by over expression of miR-23a approximately 27a approximately 24-2 cluster provides new insights in the development of novel therapeutics for cancer.

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