- Suppressor of cytokine signaling 7 inhibits prolactin, growth hormone, and leptin signaling by interacting with STAT5 or STAT3 and attenuating their nuclear translocation. Martens, N., Uzan, G., Wery, M., Hooghe, R., Hooghe-Peters, E.L., Gertler, A. J. Biol. Chem. (2005)