The Role of Tumor Necrosis Factor-α and Interferon-γ in Regulating Angiomotin-Like Protein 1 Expression in Lung Microvascular Endothelial Cells
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- Nakajima Yoshio
- Division of Pulmonary Medicine, Allergy, and Rheumatology, Department of Internal Medicine, Iwate Medical University School of Medicine
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- Nakamura Yutaka
- Division of Pulmonary Medicine, Allergy, and Rheumatology, Department of Internal Medicine, Iwate Medical University School of Medicine
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- Shigeeda Wataru
- Department of Thoracic Surgery, Iwate Medical University School of Medicine
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- Tomoyasu Makoto
- Department of Thoracic Surgery, Iwate Medical University School of Medicine
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- Deguchi Hiroyuki
- Department of Thoracic Surgery, Iwate Medical University School of Medicine
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- Tanita Tatsuo
- Department of Thoracic Surgery, Iwate Medical University School of Medicine
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- Yamauchi Kohei
- Division of Pulmonary Medicine, Allergy, and Rheumatology, Department of Internal Medicine, Iwate Medical University School of Medicine
Bibliographic Information
- Other Title
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- The role of tumor necrosis factor-alpha and interferon-gamma in regulating angiomotin-like protein 1 expression in lung microvascular endothelial cells
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Description
Background: Angiogenesis in the alveolar septa is thought be a critical factor in pulmonary emphysema. Angiomotin-like protein 1 (AmotL1) is involved in angiogenesis via regulating endothelial cell function. However, the role of AmotL1 in the pathogenesis of pulmonary emphysema has not been elucidated. The objective of this study is to evaluate the expression of AmotL1 in lung tissues from a murine model with emphysema, as well as from patients with chronic obstructive pulmonary disease (COPD). Furthermore, we analyzed the regulation of AmotL1 expression by TNF-α and IFN-γ in endothelial cells in vitro.<br> Methods: Nrf2 knockout mice were exposed to cigarette smoke (CS) for 4 weeks, and the down-regulated genes affecting vascularity in the whole lung were identified by microarray analysis. This analysis revealed that the mRNA expression of AmotL1 decreased in response to CS when compared with air exposure. To confirm the protein levels that were indicated in the microarray data, we determined the expression of AmotL1 in lung tissues obtained from patients with COPD and also determined the expression of AmotL1, NFκB and IκBα in cultured normal human lung microvascular endothelial cells (HLMVECs) that were stimulated by TNF-α and IFN-γ.<br> Results: We found that the number of AmotL1-positive vessels decreased in the emphysema lungs compared with the normal and bronchial asthmatic lungs. IFN-γ pretreatment diminished the TNF-α-induced AmotL1 in the cultured HLMVECs by blocking the degradation of IκBα.<br> Conclusions: These results suggested that IFN-γ exhibits anti-angiogenesis effects by regulating the expression of TNF-α-induced AmotL1 via NFκB in emphysema lungs.<br>
Journal
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- Allergology International
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Allergology International 62 (3), 309-322, 2013
Japanese Society of Allergology
