The Type I Collagen Fragments ICTP and CTX Reveal Distinct Enzymatic Pathways of Bone Collagen Degradation

Garnero, Patrick; Ferreras, Mercedes; Karsdal, Morten A.; NicAmhlaoibh, Róisín; Risteli, Juha; Borel, Olivier; Qvist, Per; Delmas, P.D.; Foged, NT; Delaisse, Jm.

doi:10.1359/jbmr.2003.18.5.859

Cited by 416 publications

(327 citation statements)

References 65 publications

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“…We found that ICTP and CTX were only modestly associated and ICTP -but not CTX -was highly correlated with MMPs, in particular, MMP-2. These findings suggest that in patients with metastatic bone disease, serum CTX and ICTP could reflect distinct biological pathways of bone resorption, consistent with in vitro studies showing that ICTPbut not CTX -is directly released from bone collagen matrix by MMPs, while CTX could be released from bone collagen by other proteolytic enzymes, such as cathepsin K (Garnero et al, 2003b).…”

Section: Discussionsupporting

confidence: 84%

Association of 12 serum biochemical markers of angiogenesis, tumour invasion and bone turnover with bone metastases from breast cancer: a crossectional and longitudinal evaluation

Voorzanger-Rousselot¹,

Juillet²,

Mareau³

et al. 2006

Br J Cancer

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Complex biological pathways including angiogenesis, invasion, osteoclastic activation and bone matrix degradation are involved in the formation of bone metastasis (BM). The aim of our study was to investigate the cross-sectional and longitudinal associations of a panel of 12 serum biochemical markers reflecting biological pathways underlying BM development. In a cross-sectional study, we investigated 29 patients with primary breast carcinoma without BM (BC/BMÀ), 28 patients with breast carcinoma and BM (BC/ BM þ ) and 15 healthy women. In longitudinal analyses, we investigated 34 patients for whom serum was obtained a two different time points: at the time of primary BC diagnosis and after a median time of 3 years. During this follow-up, 15 patients developed BM, whereas the other 19 remained free of BM. In patients who developed BM, the second samples were obtained before BM was documented by bone scan. The cross-sectional analyses have shown all biochemical markers to be significantly elevated in patients with BM, when compared to the patients without BM and healthy controls, except TGFb1 that was significantly decreased. Multivariable analyses showed that only the bone resorption markers TRACP 5b, CTX and ICTP, and the marker of angiogenesis VEGF were independently associated with BM. Those markers correctly distinguished 85% of BC patients with or without BM from normal individuals. Longitudinal analyses showed that patients with primary BC who developed BM during follow-up had higher levels of TRACP5b ( þ 95%, P ¼ 0.08) at the time of primary diagnosis, those patients had also a higher increases of ICTP (P ¼ 0.006), MMP-7 (P ¼ 0.004) and TIMP-1 (P ¼ 0.017) during follow-up than patients who did not progress toward bone metastasis. This study provides evidence of increase and interrelationship of circulating markers of angiogenesis, invasion and bone resorption in patients with BC with and without BM. Markers of bone resorption have the highest independent diagnostic value for detecting and potentially predicting BM in breast carcinoma patients. Bone is one of the most common sites of metastasis for certain types of tumours, especially prostate, breast and lung carcinoma (Mundy, 2002). Breast cancer progression to bone is a defining feature of a highly malignant tumour and the major cause of cancer-treatment failure. Early detection of bone metastasis is critical for clinical management and accurate staging of tumours. Currently there is no a simple way to reliably detect and predict which patients will develop bone metastasis. The detection of bone metastases relies on imaging technology, but novel approaches based on biomarker assessments are under intense investigation. Increasing body of data suggests that metastatic dissemination is site specific (Horak and Steeg, 2005) and that distinct molecular factors regulate bone metastasis formation (Yin et al, 2005). A multifactorial and multistep process of bone metastasis formation involves several biological mechanisms including angiogenesis, invasion through...

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Section: Discussionsupporting

confidence: 84%

Association of 12 serum biochemical markers of angiogenesis, tumour invasion and bone turnover with bone metastases from breast cancer: a crossectional and longitudinal evaluation

Voorzanger-Rousselot¹,

Juillet²,

Mareau³

et al. 2006

Br J Cancer

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“…33 Sharply increased C-telopeptide fragments (CrossLaps ELISA) in aortic wall samples of AAA and an even further increase in ruptured AAA show that the cysteine proteases are also involved in collagen degradation in growing and ruptured AAA. 34 We analyzed mRNA expression of the cysteine proteases cathepsin K, L, S, and V 35 as well as expression of cystatin C, the cognate endogenous inhibitor of extracellular cysteine protease activity. In contrast to the data for the MMP-collagenases, this analysis indicated clear increases in mRNA expression of cathepsin K, L, and S in both AAA as well as ruptured AAA.…”

Section: Discussionmentioning

confidence: 99%

Collagen Degradation in the Abdominal Aneurysm

Abdul-Hussien

Soekhoe

Weber

et al. 2007

The American Journal of Pathology

166

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Growth and rupture of abdominal aortic aneurysms (AAAs) result from increased collagen turnover . Collagen turnover critically depends on specific collagenases that cleave the triple helical region of fibrillar collagen. As yet , the collagenases responsible for collagen degradation in AAAs have not been identified. Increased type I collagen degradation products confirmed collagen turnover in AAAs (median values: <1 , 43 , and 108 ng/mg protein in control , growing , and ruptured AAAs , respectively). mRNA and protein analysis identified neutrophil collagenase [matrix metalloproteinase (MMP)-8] and cysteine collagenases cathepsin K , L , and S as the principle collagenases in growing and ruptured AAAs. Except for modestly increased MMP-14 mRNA levels , collagenase expression was similar in growing and ruptured AAAs (anteriorlateral wall). Evaluation of posttranslational regulation of protease activity showed a threefold increase in MMP-8 , a fivefold increase in cathepsins K and L , and a 30-fold increase in cathepsin S activation in growing and ruptured AAAs. The presence of the osteoclastic proton pump indicated optimal conditions for extracellular cysteine protease activity. Protease inhibitor mRNA expression was similar in AAAs and controls, but AAA protein levels of cystatin C, the principle cysteine protease inhibitor, were profoundly reduced (>80%). We found indications that this secondary deficiency relates to cystatin C degradation by (neutrophil-derived) proteases. Abdominal aortic aneurysm (AAA) is a common pathology and a major cause of death because of rupture. 1,2 The hallmark pathology of AAA is a persistent proteolytic imbalance that results in excess matrix destruction and progressive weakening of the arterial wall. A number of matrix metalloproteinases (MMPs) (in particular the gelatinases MMP-2 and -9) 1,3 have been implicated as primary proteolytic culprits in the disease, but it is dubious whether these proteases are directly responsible for the weakening and ultimate failure of the aortic wall. Biomechanical studies invariably show that the mechanical stability of the arterial wall essentially relies on fibrillar collagens in media and adventitia. 4 -6 These structural collagens are highly resistant toward proteolytic degradation, and the only mammalian proteases that have been shown to cleave the native triple helical region of fibrillar collagen are the classic collagenases of the MMP family 7 [ie, MMP-1, -8, and -13 and the membrane type-1 MMP (MT-1 MMP or MMP-14 8 )], as well as selected members of the cysteine protease family (ie, cathepsin K, 9,10 L, 11 and possibly S 12 ).Several reports indicate expression of these collagenases in AAA on an individual basis, but comparative data regarding expression of the collagenases, and their possible relationship to rupture of the aneurysm, 13,14 are not available. Moreover, available studies 15 do not address the critical and complex posttranslational regulation of protease activity that involves controlled secretion of an inactive proenzyme,...

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“…10,11 Degradation of the organic phase of bone is for the major part mediated by the enzyme cathepsin K, which degrades collagen type I. [12][13][14][15][16] Interestingly, abrogation of degradation of the organic phase of bone does not prevent dissolution of the inorganic phase, because the lowering of Accepted for publication October 5, 2004. pH in the osteoclastic resorption compartment remains unimpaired. 14,17 In patients with impaired acidification of the resorption lacunae either because of a mutation in the osteoclastic V-ATPase a3 or in the chloride channel ClC-7, bone resorption is impaired whereas bone formation appears unaltered or even increased.…”

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confidence: 99%

Acidification of the Osteoclastic Resorption Compartment Provides Insight into the Coupling of Bone Formation to Bone Resorption

Karsdal

Henriksen

Sørensen

et al. 2005

The American Journal of Pathology

139

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Patients with defective osteoclastic acidification have increased numbers of osteoclasts, with decreased resorption, but bone formation that remains unchanged. We demonstrate that osteoclast survival is increased when acidification is impaired, and that impairment of acidification results in inhibition of bone resorption without inhibition of bone formation. We investigated the role of acidification in human osteoclastic resorption and life span in vitro using inhibitors of chloride channels (NS5818/ NS3696), the proton pump (bafilomycin) and cathepsin K. We found that bafilomycin and NS5818 dose dependently inhibited acidification of the osteoclastic resorption compartment and bone resorption. Inhibition of bone resorption by inhibition of acidification, but not cathepsin K inhibition, augmented osteoclast survival, which resulted in a 150 to 300% increase in osteoclasts compared to controls. We investigated the effect of inhibition of osteoclastic acidification in vivo by using the rat ovariectomy model with twice daily oral dosing of NS3696 at 50 mg/kg for 6 weeks. We observed a 60% decrease in resorption (DPYR), increased tartrate-resistant acid phosphatase levels, and no effect on bone formation evaluated by osteocalcin. We speculate that attenuated acidification inhibits dissolution of the inorganic phase of bone and results in an increased number of nonresorbing osteoclasts that are responsible for the coupling to normal bone formation. Thus, we suggest that acidification is essential for normal bone remodeling and that attenuated acidification leads to uncoupling with decreased bone resorption and unaffected bone formation. The coupling process is understood as a bone formation response that is the consequence of bone resorption, with an amount of bone formed that is equal to that resorbed. 1,2 Uncoupling occurs when the balance between formation and resorption is disturbed, which might lead to either osteopetrosis or osteoporosis. 3,4 Although it has long been appreciated that bone formation is tightly coupled to bone resorption in normal adult bone turnover, 5,6 this coupling can be dissociated in some circumstances, for example during skeletal growth and in some but not all osteopetrotic mutations.Bone consists of two phases, the organic phase, which contains proteins such as collagen type I, and the inorganic phase, which consists of crystallized calcium phosphate. Dissolution of the inorganic phase of bone under the osteoclast attached to the bone surface is a prerequisite for degradation of the organic phase, and is mediated by acidification of the resorption compartment. The decrease in pH necessary to dissolve the inorganic phase is mediated by an active transport of protons over the ruffled border membrane, which is driven by an osteoclastic Vtype H ϩ ATPase. 7,8 At the same time a passive transport of chloride through chloride channels preserves the electroneutrality, 9 and is mediated by the chloride channel ClC-7. 10,11 Degradation of the organic phase of bone is for the major part mediated b...

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The Type I Collagen Fragments ICTP and CTX Reveal Distinct Enzymatic Pathways of Bone Collagen Degradation

Cited by 416 publications

References 65 publications

Association of 12 serum biochemical markers of angiogenesis, tumour invasion and bone turnover with bone metastases from breast cancer: a crossectional and longitudinal evaluation

Association of 12 serum biochemical markers of angiogenesis, tumour invasion and bone turnover with bone metastases from breast cancer: a crossectional and longitudinal evaluation

Collagen Degradation in the Abdominal Aneurysm

Acidification of the Osteoclastic Resorption Compartment Provides Insight into the Coupling of Bone Formation to Bone Resorption

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