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Dietary zinc deficiency in mice is accompanied by enhanced expression of the zinc uptake transporter Slc39a4 ( Zip4 ) and repressed expression of Slc39a5 ( Zip5 ) in tissues which regulate zinc homeostasis (intestine, pancreas and visceral yolk sac). Herein, mechanisms controlling this differential expression were investigated. The induction of  Zip4  mRNA during zinc deficiency, and its repression in response to zinc repletion were found to reflect changes in  Zip4  mRNA stability and not changes in the relative rate of transcription of this gene. During zinc deficiency, ZIP4 protein levels are increased and this protein is localized on the apical membranes. Administration of an oral gavage of zinc caused ZIP4 internalization and degradation in enterocytes and visceral endoderm cells. Similarly, ZIP4 is induced by zinc deficiency in cultured mouse Hepa cells and is rapidly degraded in response to added zinc.  Zip5  mRNA abundance does not change in response to zinc, but the translation of this mRNA was found to be zinc-responsive. During zinc deficiency,  Zip5  mRNA remains associated with polysomes, while the protein is internalized and degraded in enterocytes, acinar cells and endoderm cells. After zinc-gavage, ZIP5 is rapidly resynthesized and targeted to the basolateral membranes of these cell types.

biological chemistry

Novel zinc-responsive post-transcriptional mechanisms reciprocally regulate expression of the mouse Slc39a4 and Slc39a5 zinc transporters ( Zip4  and  Zip5 )