3.4.22.40 down interferon-gamma significantly reduces the expression of bleomycin hydrolase. The enzyme activity and expression are markedly decreased in atopic dermatitis lesional and non-lesional skin (to 27.1 and 8.8%, respectively) 717865 3.4.22.40 additional information interleukin-4 does not show any direct effect on bleomycin hydrolase expression 717865 3.4.22.40 up bleomycin hydrolase expression is up-regulated via IRF-1/2, MZF-1 and Sp-1. mRNA is up-regulated in keratinocytes when cultured at high calcium concentration (6.8fold) 717865