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2015 ; 8
(ä): 77
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High expression of endoplasmic reticulum chaperone grp94 is a novel molecular
hallmark of malignant plasma cells in multiple myeloma
#MMPMID26108343
Chhabra S
; Jain S
; Wallace C
; Hong F
; Liu B
J Hematol Oncol
2015[Jun]; 8
(ä): 77
PMID26108343
show ga
BACKGROUND: Multiple myeloma (MM) is a hematologic malignancy that is
characterized by the proliferation of abnormal bone marrow plasma cells (BMPC)
and overproduction of immunoglobulin or light chains with evidence of end-organ
damage such as bone damage, anemia, hypercalcemia, and renal dysfunction. The
pathogenesis of MM is closely linked to dysregulated unfolded protein response
(UPR) in the endoplasmic reticulum (ER). Constitutive activation of UPR in mice,
as demonstrated by transgenic expression of a master UPR transcription factor
XBP1s (a UPR-specific splice variant of X-box binding protein 1), causes myeloma.
grp94 (gp96) is a key downstream chaperone in the ER that mediates the UPR as a
part of the protein quality control mechanism in the secretory pathway. Our
recent study has shown that the persistence of plasma cells as well as the
development of myeloma in XBP1s-transgenic mice is critically dependent on grp94.
However, the role of grp94 in the initiation and progression of human MM is still
unknown. METHODS: The expression level of grp94 in BMPCs was measured by flow
cytometry, real-time RT-PCR, and Western blot analysis. We compared the
expression levels of grp94 in BMPCs in a spectrum of patients including MM,
monoclonal gammopathy of undetermined significance (MGUS), smoldering MM (SMM),
as well as non-plasma cell disorders (NPC). RESULTS: We found that grp94 was
highly expressed in malignant plasma cells in patients with MM, but not in BMPCs
in patients with MGUS/SMM and NPC. The expression level of grp94 correlated
significantly with CD138 expression level. We also found that the grp94
expression level in BMPCs from International Staging System (ISS) stage III MM
patients is higher than those in ISS stage I/II MM patients. CONCLUSIONS: grp94
is highly expressed in BMPCs in MM, which correlates with the advanced stage of
this disease. Our data demonstrated that grp94 is a novel diagnostic and
prognostic biomarker. It also positioned grp94 as a promising therapeutic target
for MM.