抗XBP1抗体 | Anti-XBP1 Antibody

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	Western Blot: XBP1 Antibody [NBP1-77681] - Total protein from HeLa cells was separated on a 12% gel by SDS-PAGE, transferred to PVDF membrane and blocked in 5% non-fat milk in TBST. The membrane was probed with 1.0 ug/ml anti-XBP1 in block buffer and detected with an anti-rabbit HRP secondary antibody using chemiluminescence. Arrow delineates XBP1s and arrowhead XBP1u.
	Immunocytochemistry/Immunofluorescence: XBP1 Antibody [NBP1-77681] - XBP1 antibody was tested in HeLa cells with FITC (green). Nuclei and actin were counterstained with Dapi (blue) and Phalloidin (red).
	Immunohistochemistry: XBP1 Antibody [NBP1-77681] - Staining of XBP1 in mouse bladder using DAB with hematoxylin counterstain.

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Background

XBP1 (X-box binding protein 1 or TREB5), is a unique bZIP transcription factor whose active form is generated by a non-conventional splicing reaction upon disruption of homeostasis in endoplasmic reticulum (ER) and unfolded protein response (UPR) activation. Originally identified as a key regulator of MHC class II gene expression in B cells, XBP1 now is known as the most conserved signaling component of UPR and is critical for cell fate determination in response to ER stress. XBP1 is a nuclear transcription factor essential for hepatocyte growth, plasma cells differentiation, immunoglobulin secretion, and UPR cascade. XBP1 acts upon ER stress by activating UPR target genes via direct binding to UPRE (the UPR element). XBP1 binds DNA preferably to the CRE-like element 5'-GATGACGTG[TG]N3[AT]T-3', and also to certain TPA response elements. XBP1 also binds to HLA DR-alpha promoter as well as to the Tax-responsive element of HTLV-I. XBP1 is up-regulated by ATF6 via direct binding to ERSE in response to ER stress. Genetic variations in XBP1 have been linked with susceptibility to major affective disorder type 7 (MAFD7).

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