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. Experimental and clinical studies strongly suggest that gelatinase A plays a central role in the evolution of glomerular injury and sclerosis. The sequences of the 5′ flanking regions of the human and rat gelatinase A genes do not share similarities with other members of the matrix metallo-proteinase gene family and are regulated in a distinctive manner. The human and rat gelatinase A genes include regions of significant homology (r2 human; RE-1 rat), which have been shown to act as potent cis-activators of transcription. The rat RE-1 sequence interacts specifically with the developmentally regulated transcription factors AP2 and YB-1, resulting in a synergistic activation of gelatinase A transcription. Although the human r2 sequence specifically interacts with AP2 ( Mol Cell Biol  10: 6524-6532, 1990), there is no clear evidence for the presence of a canonical YB-1 binding site (Y-box) within this sequence. This study demonstrates, despite the absence of a canonical Y-box sequence in the r2 element, that YB-1 and AP2 specifically interact with r2, yielding synergistic transactivation of the human gelatinase A gene. It is concluded that the r2 element is the conserved functional analog of the RE-1 element, and that interactions of AP2 and YB-1 govern human gelatinase A gene expression.

YB-1 Regulation of the Human and Rat Gelatinase A Genes via Similar Enhancer Elements