MMP7 and diabetic kidney disease: The WNT pathway activity, induced by TGF‐β signaling, is also increased in DKD and urinary excretion of MMP‐7 (matrix metalloproteinase 7), a target gene highly upregulated by WNT pathway activation, is shown to correlate with renal WNT pathway activity in animal models of kidney disease (He et al. 2012).