Abstract
Endothelin-1 (ET-1) mediates hypoxia-mediated pulmonary vascular remodeling (HPVR), and endothelin-A receptor (ET-AR) blockade prevents HPVR in newborn mice. Our objective was to determine postnatal effects of chronic hypoxia and/or ET-AR blockade on lung ET-1, ET-AR, ET-BR, and vascular collagen and elastin. Newborn C57BL/6 mice (n = 6–8/gp) given either BQ610 (ET-AR blocker) or vehicle were exposed to air or hypoxia (12% O2) from birth for 1, 3, or 14 d. Lung ET-1 was assessed by ELISA, and ET-AR and ET-BR by immunohistochemistry. Vascular collagen and elastin were assessed by quantitative image analysis. ET-1, ET-AR, ET-BR, collagen I and III, and tropoelastin mRNA levels were assessed by real-time quantitative RT-PCR. We observed that: 1) hypoxia attenuated the normal postnatal decrease in ET-1 and collagen content; 2) ET-AR blockade reduced collagen independent of O2; 3) hypoxia increased elastin mRNA expression and attenuated the normal postnatal decrease in elastin content; and 4) BQ610 reduced elastin mRNA but not elastin content. We conclude that, in neonatal mice, hypoxia attenuates normal postnatal decreases in ET-1, vascular collagen, and elastin. ET-AR blockade reduces collagen fiber area but not mRNA, and does not decrease elastin despite reducing its expression.
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Abbreviations
- ECM:
-
extracellular matrix
- ET-AR:
-
endothelin-A receptor
- ET-BR:
-
endothelin-B receptor
- ET-1:
-
endothelin-1
- HPVR:
-
hypoxia-induced pulmonary vascular remodeling
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Funded in part by the National Institute of Child Health and Human Development K08 HD046513, a grant from the CCRI, a Research Facilities Improvement Program Grant C06 RR 15490, ATS PH-06-006, and National Heart, Lung, and Blood Institute grants HL-44195, HL-50147, HL-45990, HL-07457, and HL-56046.
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Ambalavanan, N., Li, P., Bulger, A. et al. Endothelin-1 Mediates Hypoxia-Induced Increases in Vascular Collagen in the Newborn Mouse Lung. Pediatr Res 61, 559–564 (2007). https://doi.org/10.1203/pdr.0b013e318045beae
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DOI: https://doi.org/10.1203/pdr.0b013e318045beae
