Abstract:
BACKGROUND:Genesis of a cartilaginous scaffold is an obligate precursor to bone formation in heterotopic endochondral ossification (HEO). We tested the hypothesis that cartilage-derived retinoic acid-sensitive protein (CD-RAP) can serve as a plasma biomarker for the pre-osseous cartilaginous stage of HEO. Palovarotene, a retinoic acid receptor-gamma (RARγ) agonist, has been proposed as a possible treatment for fibrodysplasia ossificans progressiva (FOP) and is a potent inhibitor of HEO in mouse models. Current drug development for FOP mandates the identification of stage-specific biomarkers to facilitate the evaluation of clinical trial endpoints. RESULTS:Here we show in an injury-induced, constitutively-active transgenic mouse model of FOP that CD-RAP levels peaked between day-7 and day-10 during the zenith of histologically-identified chondrogenesis, preceded radiographically apparent HEO, and were diminished by palovarotene. Cross-sectional analysis of CD-RAP levels in plasma samples from FOP patients demonstrated a statistically non-significant trend toward higher levels in the recent flare-up period (three weeks to three months within onset of symptoms). However, in a longitudinal subgroup analysis of patients followed for at least six months after resolution of flare-up symptoms, there was a statistically significant decrease of CD-RAP when compared to levels in the same patients at the time of active or recent exacerbations. CONCLUSIONS:These data support the further exploration of CD-RAP as a stage-specific biomarker of HEO in FOP.
journal_name
Bonejournal_title
Boneauthors
Lindborg CM,Brennan TA,Wang H,Kaplan FS,Pignolo RJdoi
10.1016/j.bone.2017.09.016subject
Has Abstractpub_date
2018-04-01 00:00:00pages
153-157eissn
8756-3282issn
1873-2763pii
S8756-3282(17)30353-8journal_volume
109pub_type
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