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287 Consistent with this, upon VDR siRNA knockdown, the downregulation of TJ proteins, including CLDN1, ZO-1/2, and E-cadherin, and the reduction of TER were revealed, which were relieved by 1,25-dihydroxyvitamin D3 [1,25(OH) 2 D 3 ], suggesting the role of VDR-mediated vitamin D signaling in the regulation of TJs

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