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Activating transcription factor 2 (ATF2), a ubiquitously expressed member of the basic region leucine zipper (bZIP) family of transcription factors activated by mitogen activated protein kinase (MAPK) pathways, is important in the mediation of cellular stress responses, development and transformation. We have previously reported the differential expression of active ATF2 in the human myometrium throughout pregnancy and labour, and identified and partially characterized a novel splice variant ATF2-small (ATF2-sm). To further understand the role of these factors in the myometrium, we have used gene microarrays to define the target genes in cultured myometrial cells stably-transfected with ATF2 and ATF2-sm cDNAs. Many of the genes identified appear to have potential roles in regulating myometrial function and include proteins involved in G-protein receptor signalling, cytokine signalling, transcriptional regulation, cell-cycle control, formation of the extracellular matrix and cytoskeletal architecture. ATF2 was found to affect the expression of 204 genes; 113 being up-regulated and 91 down-regulated whereas the novel ATF2-sm factor altered the expression of 55 genes; expression was increased in 29 cases and decreased in 26. A further 25 genes affected by ATF2-sm were identified by suppression subtractive hybridisation (SSH). Notably, the genes affected by ATF2 and ATF2-sm appear to belong to discrete groups: only two genes were affected by both factors.

journal of molecular endocrinology

Identification of human myometrial target genes of the c-Jun NH2-terminal kinase (JNK) pathway: the role of activating transcription factor 2 (ATF2) and a novel spliced isoform ATF2-small