Bortezomib increases osteoblast activity in myeloma patients irrespective of response to treatment.

Abstract:

OBJECTIVES:Myeloma bone disease is a result of excessive osteoclast activation and impaired osteoblast function. Recent in vitro studies suggested that proteasome inhibitors might increase osteoblast function. METHODS:We analyzed serum markers of osteoblast activity in 25 patients with multiple myeloma receiving bortezomib alone or in combination with dexamethasone. As control, serum samples from 58 consecutive myeloma patients receiving a therapy different than bortezomib (i.e. adriamycin/dexamethasone, melphalan/prednisone or thalidomide) were evaluated. The serum concentrations of bone-specific alkaline phosphatase (BAP) and osteocalcin were quantified before initiation of treatment and after 3 months. RESULTS:In patients treated with bortezomib, mean serum levels of osteocalcin significantly increased from 6.3 to 10.8 microg/L (P = 0.024), while mean BAP levels increased from 19.7 to 30.2 U/L (P < 0.0005). Of interest, the increase in BAP was significant both in responders and non-responders. In contrast, the control group did not show a statistically significant change in BAP (24.8 U/L vs. 23.3 U/L) and osteocalcin (6.8 microg/L vs. 6.5 microg/L) before and after the treatment. CONCLUSION:These data show that treatment with bortezomib leads to enhanced markers of osteoblast activity in patients with myeloma. The comparison with the control group suggests that the effect on osteoblasts is unique to the proteasome inhibitor.

journal_name

Eur J Haematol

authors

Heider U,Kaiser M,Müller C,Jakob C,Zavrski I,Schulz CO,Fleissner C,Hecht M,Sezer O

doi

10.1111/j.1600-0609.2006.00692.x

subject

Has Abstract

pub_date

2006-09-01 00:00:00

pages

233-8

issue

3

eissn

0902-4441

issn

1600-0609

pii

EJH692

journal_volume

77

pub_type

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