miR-18, a member of Oncomir-1, targets heat shock transcription factor 2 in spermatogenesis

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Björk JK, Sandqvist A, Elsing AN, Kotaja N, Sistonen L
Publisher: COMPANY OF BIOLOGISTS LTD
Publication year: 2010
Journal: Development
Journal acronym: DEVELOPMENT
Volume number: 137
Issue number: 19
Start page: 3177
End page: 3184
Number of pages: 8
ISSN: 0950-1991
eISSN: 1477-9129


Abstract

miR-18 belongs to the Oncomir-1 or miR-17 similar to 92 cluster that is intimately associated with the occurrence and progression of different types of cancer. However, the physiological roles of the Oncomir-1 cluster and its individual miRNAs are largely unknown. Here, we describe a novel function for miR-18 in mouse. We show that miR-18 directly targets heat shock factor 2 (HSF2), a transcription factor that influences a wide range of developmental processes including embryogenesis and gametogenesis. Furthermore, we show that miR-18 is highly abundant in testis, displaying distinct cell-type-specific expression during the epithelial cycle that constitutes spermatogenesis. Expression of HSF2 and of miR-18 exhibit an inverse correlation during spermatogenesis, indicating that, in germ cells, HSF2 is downregulated by miR-18. To investigate the in vivo function of miR-18 we developed a novel method, T-GIST, and demonstrate that inhibition of miR-18 in intact seminiferous tubules leads to increased HSF2 protein levels and altered expression of HSF2 target genes. Our results reveal that miR-18 regulates HSF2 activity in spermatogenesis and link miR-18 to HSF2-mediated physiological processes such as male germ cell maturation.


Keywords

HSF, microRNA, miR-17 similar to 92, Mouse, Speer4a, Ssty2, T-GIST

Last updated on 2019-21-04 at 04:41