MAY 30, 2014 11:30 AM PDT

Keynote: Biochemical Markers of Bone Turnover in the Management of Postmenopausal Osteoporosis

Speaker
  • Distinguished Clinical Professor of Medicine, University of Colorado Health Sciences Center Medical Director Colorado Center for Bone Research
    BIOGRAPHY

Abstract

Bone turnover markers (BTM) are biological markers of bone remodeling (turnover). The entire skeleton is replaced every 10 years by remodeling, a process constantly going on at different phases throughout the skeleton (Figure 1). The purposes of remodeling are to repair the microcracks that occur in the skeleton with daily mechanical loading.

From these bone remodeling cavities proteins (BTM) are released into the circulation and can be measured by radioimmunoassay or immunoassay. (Figure 2)

The clinical evidence is consistent that these markers are useful for:

1. Determining the rate of bone turnover (high bone turnover is an independent risk factor for osteoporotic fracture) and predicting the rate of bone loss.

2. Assessing response to osteoporosis treatments (both anti-resorptive as well as anabolic agents). The change in the BTM after the initiation of treatment occurs rapidly-within 3 months of starting therapy and, therefore, provide much earlier information on compliance, and a bone effect than bone mineral density (BMD) which requires 1-2 years to see a measureable change. A change in the BTM also predicts improvements in BMD and predicts fracture risk reduction

Two large international groups: The International Osteoporosis Foundation-International Federation of Clinical Chemistry and The National Bone Health Alliance-American Association of Clinical Chemistry both have both endorsed, based on evidence, that the preferred BTM for bone formation is the propeptide type I collagen (PINP) and for bone resorption the collagen cross-link, C-telopeptide (CTX).


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MAY 30, 2014 11:30 AM PDT

Keynote: Biochemical Markers of Bone Turnover in the Management of Postmenopausal Osteoporosis


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