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2015 ; 16
(8
): 18825-35
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Osteoclast Differentiation Is Impaired in a Subgroup of SLE Patients and
Correlates Inversely with Mycophenolate Mofetil Treatment
#MMPMID26274951
Fürnrohr BG
; Rhodes B
; Munoz LE
; Weiß K
; Vyse TJ
; Schett G
Int J Mol Sci
2015[Aug]; 16
(8
): 18825-35
PMID26274951
show ga
Osteoporosis can arise in systemic lupus erythematosus (SLE) patients secondary
to medication and/or chronic inflammation. To analyze if patients with SLE have
phenotypically-impaired osteoclastogenesis, we differentiated ex vivo monocytes
from 72 SLE patients and 15 healthy individuals into osteoclasts followed by TRAP
staining and counting. We identified a subgroup of SLE patients (45%) with a
significantly impaired osteoclast differentiation, relative to the other SLE
patients or healthy individuals (OR 11.2; 95% CI 1.4-89.9). A review of
medication indicated that patients with osteoclast counts equal to healthy donors
were significantly more likely to be treated with mycophenolate mofetil (MMF)
compared to patients with impaired osteoclastogenesis. We analyzed expression of
RANKL and the MMF target genes IMPDH1 and IMPDH2 in osteoclasts by qPCR, but
detected no difference. Since MMF might influence interferon-? (IFN?) and -?
(IFN?) we measured serum IFN? and IFN? levels. Patients with very low osteoclast
counts also had comparably higher IFN? serum levels than patients with normal
osteoclast counts. We conclude that in vitro osteoclastogenesis is impaired in a
subgroup of SLE patients. This correlates inversely with MMF treatment and high
IFN? serum levels. Further observational study will be required to determine
whether this translates into a clinically meaningful effect.
|*Cell Differentiation
[MESH]
|Adrenal Cortex Hormones/therapeutic use
[MESH]
|Anti-Inflammatory Agents, Non-Steroidal/*therapeutic use
[MESH]