Function:Plays a major role in tight junction-specific obliteration of the intercellular space. ,induction:By androgens. ,similarity:Belongs to the claudin family. ,subunit:Directly interacts with TJP1/ZO-1 , TJP2/ZO-2 and TJP3/ZO-3. ,tissue specificity:Expressed in kidney , lung and prostate. Isoform 1 seems to be predominant , except in some normal prostate samples , where isoform 2 is the major form. Down-regulated in breast cancers , including ductal carcinoma in situ (DCIS) , lobular carcinoma in situ (LCIS) and invasive ductal carcinoma (IDC) (at protein level) , as well as in several cancer cell lines. Loss of expression correlates with histological grade , occurring predominantly in high-grade lesions. ,
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