AMP-Kinase Dysfunction Alters Notch Ligands to Impair Angiogenesis in Neonatal Pulmonary Hypertension

Decreased angiogenesis contributes to persistent pulmonary hypertension of the newborn (PPHN); mechanisms remain unclear. AMPK (5'AMP activated protein kinase) is a key regulator of cell metabolism. We investigated the hypothesis that a decrease in AMPK function leads to mitochondrial dysfuncti...

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Veröffentlicht in:American journal of respiratory cell and molecular biology 2020-06, Vol.62 (6), p.719-731
Hauptverfasser: Rana, Ujala, Callan, Emily, Entringer, Brianna, Michalkiewicz, Teresa, Joshi, Amit, Parchur, Abdul K, Teng, Ru-Jeng, Konduri, Girija G
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container_issue 6
container_start_page 719
container_title American journal of respiratory cell and molecular biology
container_volume 62
creator Rana, Ujala
Callan, Emily
Entringer, Brianna
Michalkiewicz, Teresa
Joshi, Amit
Parchur, Abdul K
Teng, Ru-Jeng
Konduri, Girija G
description Decreased angiogenesis contributes to persistent pulmonary hypertension of the newborn (PPHN); mechanisms remain unclear. AMPK (5'AMP activated protein kinase) is a key regulator of cell metabolism. We investigated the hypothesis that a decrease in AMPK function leads to mitochondrial dysfunction and altered balance of notch ligands delta-like 4 (DLL4) and Jagged 1 (Jag1) to impair angiogenesis in PPHN. Studies were done in fetal lambs with PPHN induced by prenatal ductus arteriosus constriction and gestation-matched control lambs. PPHN lambs were treated with saline or AMPK agonist metformin. Angiogenesis was assessed in lungs with micro-computed tomography angiography and histology. AMPK function; expression of mitochondrial electron transport chain (ETC) complex proteins I-V, Dll4, and Jag1; mitochondrial number; and angiogenesis function were assessed in pulmonary artery endothelial cells (PAEC) from control and PPHN lambs. AMPK function was decreased in PPHN PAEC and lung sections. Expression of mitochondrial transcription factor, PGC-1α, ETC complex proteins I-V, and mitochondrial number were decreased in PPHN. angiogenesis of PAEC and capillary number and vessel volume fraction in the lung were decreased in PPHN. Expression of DLL4 was increased and Jag1 was decreased in PAEC from PPHN lambs. AMPK agonists A769662 and metformin increased the mitochondrial complex proteins and number, angiogenesis, and Jag1 levels and decreased DLL4 levels in PPHN PAEC. Infusion of metformin increased the vessel density in PPHN lungs. Decreased AMPK function contributes to impaired angiogenesis in PPHN by altered balance of notch ligands in PPHN.
doi_str_mv 10.1165/rcmb.2019-0275OC
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mechanisms remain unclear. AMPK (5'AMP activated protein kinase) is a key regulator of cell metabolism. We investigated the hypothesis that a decrease in AMPK function leads to mitochondrial dysfunction and altered balance of notch ligands delta-like 4 (DLL4) and Jagged 1 (Jag1) to impair angiogenesis in PPHN. Studies were done in fetal lambs with PPHN induced by prenatal ductus arteriosus constriction and gestation-matched control lambs. PPHN lambs were treated with saline or AMPK agonist metformin. Angiogenesis was assessed in lungs with micro-computed tomography angiography and histology. AMPK function; expression of mitochondrial electron transport chain (ETC) complex proteins I-V, Dll4, and Jag1; mitochondrial number; and angiogenesis function were assessed in pulmonary artery endothelial cells (PAEC) from control and PPHN lambs. AMPK function was decreased in PPHN PAEC and lung sections. Expression of mitochondrial transcription factor, PGC-1α, ETC complex proteins I-V, and mitochondrial number were decreased in PPHN. angiogenesis of PAEC and capillary number and vessel volume fraction in the lung were decreased in PPHN. Expression of DLL4 was increased and Jag1 was decreased in PAEC from PPHN lambs. AMPK agonists A769662 and metformin increased the mitochondrial complex proteins and number, angiogenesis, and Jag1 levels and decreased DLL4 levels in PPHN PAEC. Infusion of metformin increased the vessel density in PPHN lungs. Decreased AMPK function contributes to impaired angiogenesis in PPHN by altered balance of notch ligands in PPHN.</abstract><cop>United States</cop><pub>American Thoracic Society</pub><pmid>32048878</pmid><doi>10.1165/rcmb.2019-0275OC</doi><tpages>13</tpages><oa>free_for_read</oa></addata></record>
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subjects AMP
Angiogenesis
Angiography
Animals
Animals, Newborn
Computed tomography
Ductus Arteriosus - embryology
Ductus Arteriosus - surgery
Electron Transport
Electron transport chain
Endothelial cells
Endothelial Cells - enzymology
Enzyme Activation
Female
Fetuses
Gestation
Hypertension
Hypertension, Pulmonary - enzymology
Hypertension, Pulmonary - physiopathology
Intracellular Signaling Peptides and Proteins - metabolism
Jagged-1 Protein - metabolism
Ligands
Lung - pathology
Membrane Proteins - metabolism
Metformin
Metformin - pharmacology
Metformin - therapeutic use
Mitochondria
Mitochondria - metabolism
Neonates
Neovascularization, Pathologic - drug therapy
Neovascularization, Pathologic - enzymology
Original Research
Persistent Fetal Circulation Syndrome - drug therapy
Persistent Fetal Circulation Syndrome - enzymology
Persistent Fetal Circulation Syndrome - pathology
Persistent Fetal Circulation Syndrome - physiopathology
Phosphorylation
Pregnancy
Protein kinase
Protein Kinases - metabolism
Protein Kinases - physiology
Protein transport
Pulmonary artery
Pulmonary hypertension
Pyrones - pharmacology
Receptors, Notch - metabolism
Sheep
Thiophenes - pharmacology
Threonine - metabolism
Transfection
title AMP-Kinase Dysfunction Alters Notch Ligands to Impair Angiogenesis in Neonatal Pulmonary Hypertension
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