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Matrix metalloproteinase-9 and tissue inhibitor of metalloproteinase-1: expression in the lung of fetal rats with nitrofen-induced diaphragmatic hernia

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Abstract.

The surrounding extracellular matrix of airway wall tissues changes in response to mechanical stresses and hypoxia. The presence of matrix metalloproteinase-9 (MMP-9) and its inhibitor, tissue inhibitor of metalloproteinase-1 (TIMP-1), is correlated with collagen degradation and tissue repair in lung disorders. The aim of this study was to evaluate the expression of MMP-9 and TIMP-1 in the lung of fetal rats with nitrofen-induced congenital diaphragmatic hernia (CDH). Administering 100 mg of nitrofen dissolved in 1 ml olive oil to pregnant Wistar rats on day 9 of gestation induced left-sided CDH in fetal rats. In control animals, the same dose of olive oil was given without nitrofen. Cesarean section was performed on day 21 of gestation. The fetuses were divided into two groups: normal controls (n = 10) and nitrofen-induced left-sided CDH (n = 10). Immunoreactivity of the staining for MMP-9 and TIMP-1 in the lung tissues was semiquantitatively analyzed using the staining scores. The relative amount of MMP-9 or TIMP-1 divided by the amount of β-actin for each lung sample was measured by using the real-time reverse-transcriptase polymerase chain reaction. The immunoreactivity of MMP-9 was significantly increased in the CDH group (n = 5) compared with the control group (n = 5) (p = 0.031). On the other hand, the immunoreactivity of TIMP-1 in the two groups was not significantly different (n = 0.134). The relative amount of MMP-9 (or TIMP-1) in the CDH group (n = 5) does not differ significantly from that in the control group (n = 5) (p = 0.059, 0.596, respectively), but the relative amount of MMP-9 is higher in the CDH group, although it is not significantly higher. On the other hand, the ratios of MMP-9 to TIMP-1 were significantly higher in the CDH group (p = 0.028). In conclusion, fetal rats with nitrofen-induced CDH, a model of respiratory disorders, manifested the excess of MMP-9 activity due to the absence of TIMP-1 that would suggest a trend toward disruption of the extracellular matrix in the CDH lung tissues.

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Authors and Affiliations

  1. First Department of Surgery, Nara Medical University, Shijo-cho, Kashihara, Nara 634-8522, Japan

    Y. Tatekawa, H. Kanehiro, M. Hisanaga & Y. Nakajima

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  1. Y. Tatekawa
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  2. H. Kanehiro
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  3. M. Hisanaga
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  4. Y. Nakajima
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Correspondence to Y. Tatekawa.

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Tatekawa, Y., Kanehiro, H., Hisanaga, M. et al. Matrix metalloproteinase-9 and tissue inhibitor of metalloproteinase-1: expression in the lung of fetal rats with nitrofen-induced diaphragmatic hernia. Ped Surgery Int 19, 25–28 (2003). https://doi.org/10.1007/s00383-002-0890-4

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