Open Access

Interstitial collagen turnover during airway remodeling in acute and chronic experimental asthma

  • Authors:
    • Georgina González‑Avila
    • Blanca Bazan‑Perkins
    • Cuauhtémoc Sandoval
    • Bettina Sommer
    • Sebastian Vadillo‑Gonzalez
    • Carlos Ramos
    • Arnoldo Aquino‑Galvez
  • View Affiliations

  • Published online on: July 5, 2016     https://doi.org/10.3892/etm.2016.3509
  • Pages: 1419-1427
  • Copyright: © González‑Avila et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Asthma airway remodeling is characterized by the thickening of the basement membrane (BM) due to an increase in extracellular matrix (ECM) deposition, which contributes to the irreversibility of airflow obstruction. Interstitial collagens are the primary ECM components to be increased during the fibrotic process. The aim of the present study was to examine the interstitial collagen turnover during the course of acute and chronic asthma, and 1 month after the last exposure to the allergen. Guinea pigs sensitized to ovalbumin (OVA) and exposed to 3 further OVA challenges (acute model) or 12 OVA challenges (chronic model) were used as asthma experimental models. A group of animals from either model was sacrificed 1 h or 1 month after the last OVA challenge. Collagen distribution, collagen content, interstitial collagenase activity and matrix metalloproteinase (MMP)‑1, MMP‑13 and tissue inhibitor of metalloproteinase (TIMP)‑1 protein expression levels were measured in the lung tissue samples from both experimental models. The results revealed that collagen deposit in bronchiole BM, adventitial and airway smooth muscle layers was increased in both experimental models as well as lung tissue collagen concentration. These structural changes persisted 1 month after the last OVA challenge. In the acute model, a decrease in collagenase activity and in MMP‑1 concentration was observed. Collagenase activity returned to basal levels, and an increase in MMP‑1 and MMP‑13 expression levels along with a decrease in TIMP‑1 expression levels were observed in animals sacrificed 1 month after the last OVA challenge. In the chronic model, there were no changes in collagenase activity or in MMP‑13 concentration, although MMP‑1 expression levels increased. One month later, an increase in collagenase activity was observed, although MMP‑1 and TIMP‑1 levels were not altered. The results of the present study suggest that even when the allergen challenges were discontinued, and collagenase activity and MMP‑1 expression increased, fibrosis remained, contributing to the irreversibility of bronchoconstriction.

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September-2016
Volume 12 Issue 3

Print ISSN: 1792-0981
Online ISSN:1792-1015

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Spandidos Publications style
González‑Avila G, Bazan‑Perkins B, Sandoval C, Sommer B, Vadillo‑Gonzalez S, Ramos C and Aquino‑Galvez A: Interstitial collagen turnover during airway remodeling in acute and chronic experimental asthma. Exp Ther Med 12: 1419-1427, 2016.
APA
González‑Avila, G., Bazan‑Perkins, B., Sandoval, C., Sommer, B., Vadillo‑Gonzalez, S., Ramos, C., & Aquino‑Galvez, A. (2016). Interstitial collagen turnover during airway remodeling in acute and chronic experimental asthma. Experimental and Therapeutic Medicine, 12, 1419-1427. https://doi.org/10.3892/etm.2016.3509
MLA
González‑Avila, G., Bazan‑Perkins, B., Sandoval, C., Sommer, B., Vadillo‑Gonzalez, S., Ramos, C., Aquino‑Galvez, A."Interstitial collagen turnover during airway remodeling in acute and chronic experimental asthma". Experimental and Therapeutic Medicine 12.3 (2016): 1419-1427.
Chicago
González‑Avila, G., Bazan‑Perkins, B., Sandoval, C., Sommer, B., Vadillo‑Gonzalez, S., Ramos, C., Aquino‑Galvez, A."Interstitial collagen turnover during airway remodeling in acute and chronic experimental asthma". Experimental and Therapeutic Medicine 12, no. 3 (2016): 1419-1427. https://doi.org/10.3892/etm.2016.3509