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MMP-9 protein level does not reflect overall MMP activity in the airways of patients with COPD.
Respir Med. 2008 Jun; 102(6):845-51.RM

Abstract

BACKGROUND

Animal and human studies have implicated an imbalance of matrix metalloproteinases (MMPs) and tissue inhibitors of matrix metalloproteinases (TIMPs) in the pathogenesis of chronic obstructive pulmonary disease (COPD). MMP-9 protein is increased in COPD and we hypothesized that total MMP activity would be raised although this has not previously been measured.

METHODS

Using fluorescence and biotin labelled MMP assays, RT-PCR, western blotting and enzyme-linked immunosorbent assay we examined total MMP activity, specific gelatinase, elastase, collagenase activity, TIMP-1 and TIMP-2 in induced sputum from smokers with COPD and smokers without COPD.

RESULTS

Induced sputum was obtained from 15 smokers with COPD and 14 smokers without COPD. MMP-9 levels were higher in those with COPD compared with controls (p<0.05). Total MMP activity, specific gelatinase, collagenase and elastase activities were not higher in COPD patients. In addition, reduced MMP activity was correlated with increasing airflow obstruction in COPD (p=0.016).

CONCLUSION

MMP-9 protein but not MMP activity was higher in sputum of COPD patients compared with controls. These results suggest that MMP-9 levels may not reflect the overall MMP activity in the airways of patients with COPD suggesting a complex relationship between MMP-9 protein and activity. Further studies of MMPs in COPD should comprise activity measures in addition to protein levels.

Authors+Show Affiliations

Nottingham University Hospitals NHS Trust, Nottingham, UK.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18328682

Citation

Lowrey, Gillian E., et al. "MMP-9 Protein Level Does Not Reflect Overall MMP Activity in the Airways of Patients With COPD." Respiratory Medicine, vol. 102, no. 6, 2008, pp. 845-51.
Lowrey GE, Henderson N, Blakey JD, et al. MMP-9 protein level does not reflect overall MMP activity in the airways of patients with COPD. Respir Med. 2008;102(6):845-51.
Lowrey, G. E., Henderson, N., Blakey, J. D., Corne, J. M., & Johnson, S. R. (2008). MMP-9 protein level does not reflect overall MMP activity in the airways of patients with COPD. Respiratory Medicine, 102(6), 845-51. https://doi.org/10.1016/j.rmed.2008.01.006
Lowrey GE, et al. MMP-9 Protein Level Does Not Reflect Overall MMP Activity in the Airways of Patients With COPD. Respir Med. 2008;102(6):845-51. PubMed PMID: 18328682.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - MMP-9 protein level does not reflect overall MMP activity in the airways of patients with COPD. AU - Lowrey,Gillian E, AU - Henderson,Neil, AU - Blakey,John D, AU - Corne,Jonathan M, AU - Johnson,Simon R, Y1 - 2008/03/06/ PY - 2007/09/04/received PY - 2008/01/03/revised PY - 2008/01/14/accepted PY - 2008/3/11/pubmed PY - 2008/8/30/medline PY - 2008/3/11/entrez SP - 845 EP - 51 JF - Respiratory medicine JO - Respir Med VL - 102 IS - 6 N2 - BACKGROUND: Animal and human studies have implicated an imbalance of matrix metalloproteinases (MMPs) and tissue inhibitors of matrix metalloproteinases (TIMPs) in the pathogenesis of chronic obstructive pulmonary disease (COPD). MMP-9 protein is increased in COPD and we hypothesized that total MMP activity would be raised although this has not previously been measured. METHODS: Using fluorescence and biotin labelled MMP assays, RT-PCR, western blotting and enzyme-linked immunosorbent assay we examined total MMP activity, specific gelatinase, elastase, collagenase activity, TIMP-1 and TIMP-2 in induced sputum from smokers with COPD and smokers without COPD. RESULTS: Induced sputum was obtained from 15 smokers with COPD and 14 smokers without COPD. MMP-9 levels were higher in those with COPD compared with controls (p<0.05). Total MMP activity, specific gelatinase, collagenase and elastase activities were not higher in COPD patients. In addition, reduced MMP activity was correlated with increasing airflow obstruction in COPD (p=0.016). CONCLUSION: MMP-9 protein but not MMP activity was higher in sputum of COPD patients compared with controls. These results suggest that MMP-9 levels may not reflect the overall MMP activity in the airways of patients with COPD suggesting a complex relationship between MMP-9 protein and activity. Further studies of MMPs in COPD should comprise activity measures in addition to protein levels. SN - 0954-6111 UR - https://www.unboundmedicine.com/medline/citation/18328682/MMP_9_protein_level_does_not_reflect_overall_MMP_activity_in_the_airways_of_patients_with_COPD_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0954-6111(08)00037-1 DB - PRIME DP - Unbound Medicine ER -