Abstract:
:Long non-coding RNAs (lncRNAs) can participate in the pathological process of multiple myeloma (MM) via regulation of specific gene expression and function. This research aimed to study the role of MALAT-1 and the underlying mechanism in MM. In this study, the expression of MALAT-1 and HMGB1 protein in the bone marrow mononuclear cells from MM patients at different stages and in MM cell lines was determined by qRT-PCR and western blot, respectively. The endogenous expression of MALAT-1 and HMGB1 was modulated using lentivirus vectors transfection. CHX chase assay and RIP analyses were performed to explore the interaction between MALAT-1 and HMGB1 in MM. Nude mouse xenograft was made and used for in vivo experiment study. The expression of MALAT-1 and HMGB1 in the bone marrow mononuclear cells from patients with untreated multiple myeloma was dramatically increased, as well as in MM cell lines, KM3 and U266; while MALAT-1 expression and HMGB1 protein level both decreased significantly in complete remission patients. Furthermore, MALAT-1 knockdown facilitated the degradation of HMGB1 at the post-translational level via increase of the ubiquitination of HMGB1 in MM cells. MALAT-1 was shown to promote autophagy in MM through upregulation of HMGB1. In vivo, MALAT-1 knockdown could inhibit tumor growth significantly in tumor-bearing mice and reduced the protein expressions of HMGB1, Beclin-1, and LC3B in tumor tissues. LncRNA MALAT-1 increases the expression level of HMGB1 in MM thereby promotes autophagy resulting in the inhibition of apoptosis. J. Cell. Biochem. 118: 3341-3348, 2017. © 2017 Wiley Periodicals, Inc.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Gao D,Lv AE,Li HP,Han DH,Zhang YPdoi
10.1002/jcb.25987subject
Has Abstractpub_date
2017-10-01 00:00:00pages
3341-3348issue
10eissn
0730-2312issn
1097-4644journal_volume
118pub_type
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