Chaperon Protein GRP78 Released from MPN Cells Increase Expression of Lysyl Oxidase in Human Stroma Cell Line (ASH 2023)
To address the mechanism responsible for the induction of GRP78, we treated the HEL and SET-2 cells with 4-phenyl butyric acid and tauroursodeoxycholic acid both of which are well known inhibitors of ER stress, however, these inhibitors did not affect the expression levels of GRP78...In contrast, ruxolitinib, an inhibitor of JAK2V617F, blocked GRP78 expression in these cells...In conclusion, we demonstrated that GRP78 was overexpressed both in MPN derived cell lines and also in primary megakaryocytes from MF patients. Our observations proposed that overexpressed GRP78 in MPN cells contribute development of myelofibrosis through secreted in microenvironment and induced expression of extracellular matrix modulating enzyme LOX in bone marrow stromal cells.