Journal
INTERNATIONAL JOURNAL OF LABORATORY HEMATOLOGY
Volume 37, Issue 1, Pages 29-35Publisher
WILEY
DOI: 10.1111/ijlh.12216
Keywords
Multiple myeloma; osteoclastic precursor; monocytes; bone
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IntroductionOsteolytic bone destruction is a major clinical problem in multiple myeloma patients. Osteoclasts can differentiate in vitro from bone marrow-resident monocyte progenitors, such as common monocyte progenitors, as well as circulating monocytes. Various types of monocytes, including osteoclast precursors, appear to circulate systemically. MethodsWe investigated the possibility of demonstrating, by in vitro differentiation and flow cytometry, a circulating osteoclast precursor population in multiple myeloma (MM) patients by studying the distribution of CD14(+/++) CD11b(+) CD51/61(+) and CD14(+/++) CD16(+/-) populations. ResultsUnder short-term in vitro osteoclastic differentiation conditions, almost all CD14 monocytes acquired CD51/61 and CD16 expression. Flow cytometry studies failed to demonstrate a statistically significant increase in circulating CD14(+/++) CD11b(+) CD51/61(+) populations in 20 MM patients with osteolytic lesions. However, the minor circulating CD14(+/++) CD16(+) fraction was significantly increased in MM patients compared with healthy volunteers (109.363.1/mm(3)vs. 65.3 +/- 34.9/mm(3); P=0.005), but with no correlation with markers of tumour burden. The CD14(+/++) CD16(+) to CD14(+/++) CD16(-) ratio was higher in MM patients. ConclusionThe circulating CD14(+/++) CD11b(+) CD51/61(+) fraction was not correlated with bone lesions in MM patients. However, CD14(+/++) CD16(+) monocytes may be a candidate marker. A larger study must be conducted to confirm these promising results for the diagnosis and follow-up of MM patients.
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