The Angiopoietin-Tie2 axis contributes to placental vascular disruption and adverse birth outcomes in malaria in pregnancy
Background: Malaria during pregnancy is a major contributor to the global burden of adverse birth outcomes including fetal growth restriction, preterm birth, and fetal loss. Recent evidence supports a role for angiogenic dysregulation and perturbations to placental vascular development in the pathob...
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Elsevier
2021
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oai:doaj.org-article:70589bcf3d034d399a3578776efe1f172021-11-10T04:28:17ZThe Angiopoietin-Tie2 axis contributes to placental vascular disruption and adverse birth outcomes in malaria in pregnancy2352-396410.1016/j.ebiom.2021.103683https://doaj.org/article/70589bcf3d034d399a3578776efe1f172021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2352396421004771https://doaj.org/toc/2352-3964Background: Malaria during pregnancy is a major contributor to the global burden of adverse birth outcomes including fetal growth restriction, preterm birth, and fetal loss. Recent evidence supports a role for angiogenic dysregulation and perturbations to placental vascular development in the pathobiology of malaria in pregnancy. The Angiopoietin-Tie2 axis is critical for placental vascularization and remodeling. We hypothesized that disruption of this pathway would contribute to malaria-induced adverse birth outcomes. Methods: Using samples from a previously conducted prospective cohort study of pregnant women in Malawi, we measured circulating levels of angiopoietin-1 (Angpt-1) and Angpt-2 by Luminex (n=1392). We used a preclinical model of malaria in pregnancy (Plasmodium berghei ANKA [PbA] in pregnant BALB/c mice), genetic disruption of Angpt-1 (Angpt1+/− mice), and micro-CT analysis of placental vasculature to test the hypothesis that disruptions to the Angpt-Tie2 axis by malaria during pregnancy would result in aberrant placental vasculature and adverse birth outcomes. Findings: Decreased circulating levels of Angpt-1 and an increased ratio of Angpt-2/Angpt-1 across pregnancy were associated with malaria in pregnancy. In the preclinical model, PbA infection recapitulated disruptions to the Angiopoietin-Tie2 axis resulting in reduced fetal growth and viability. Malaria decreased placental Angpt-1 and Tie2 expression and acted synergistically with reduced Angpt-1 in heterozygous dams (Angpt1+/−), to worsen birth outcomes by impeding vascular remodeling required for placental function. Interpretation: Collectively, these data support a mechanistic role for the Angpt-Tie2 axis in malaria in pregnancy, including a potential protective role for Angpt-1 in mitigating infection-associated adverse birth outcomes. Funding: This work was supported by the Canadian Institutes of Health Research (CIHR), Canada Research Chair, and Toronto General Research Institute Postdoctoral Fellowship Award. The parent trial was supported by the European & Developing Countries Clinical Trials Partnership and the Malaria in Pregnancy Consortium, which was funded by the Bill & Melinda Gates Foundation. The funders had no role in design, analysis, or reporting of these studies.Vanessa TranAndrea M. WeckmanValerie M. CrowleyLindsay S. CahillKathleen ZhongAna CabreraRobyn E. ElphinstoneVictoria PearceMwayiwawo MadanitsaLinda Kalilani-PhiriVictor MwapasaCarole KhairallahAndrea L. ConroyFeiko O. ter KuileJohn G. SledKevin C. KainElsevierarticleMalariapregnancyangiopoietin-Tie2placental vasculatureangiopoietin-1MedicineRMedicine (General)R5-920ENEBioMedicine, Vol 73, Iss , Pp 103683- (2021) |
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Malaria pregnancy angiopoietin-Tie2 placental vasculature angiopoietin-1 Medicine R Medicine (General) R5-920 |
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Malaria pregnancy angiopoietin-Tie2 placental vasculature angiopoietin-1 Medicine R Medicine (General) R5-920 Vanessa Tran Andrea M. Weckman Valerie M. Crowley Lindsay S. Cahill Kathleen Zhong Ana Cabrera Robyn E. Elphinstone Victoria Pearce Mwayiwawo Madanitsa Linda Kalilani-Phiri Victor Mwapasa Carole Khairallah Andrea L. Conroy Feiko O. ter Kuile John G. Sled Kevin C. Kain The Angiopoietin-Tie2 axis contributes to placental vascular disruption and adverse birth outcomes in malaria in pregnancy |
| description |
Background: Malaria during pregnancy is a major contributor to the global burden of adverse birth outcomes including fetal growth restriction, preterm birth, and fetal loss. Recent evidence supports a role for angiogenic dysregulation and perturbations to placental vascular development in the pathobiology of malaria in pregnancy. The Angiopoietin-Tie2 axis is critical for placental vascularization and remodeling. We hypothesized that disruption of this pathway would contribute to malaria-induced adverse birth outcomes. Methods: Using samples from a previously conducted prospective cohort study of pregnant women in Malawi, we measured circulating levels of angiopoietin-1 (Angpt-1) and Angpt-2 by Luminex (n=1392). We used a preclinical model of malaria in pregnancy (Plasmodium berghei ANKA [PbA] in pregnant BALB/c mice), genetic disruption of Angpt-1 (Angpt1+/− mice), and micro-CT analysis of placental vasculature to test the hypothesis that disruptions to the Angpt-Tie2 axis by malaria during pregnancy would result in aberrant placental vasculature and adverse birth outcomes. Findings: Decreased circulating levels of Angpt-1 and an increased ratio of Angpt-2/Angpt-1 across pregnancy were associated with malaria in pregnancy. In the preclinical model, PbA infection recapitulated disruptions to the Angiopoietin-Tie2 axis resulting in reduced fetal growth and viability. Malaria decreased placental Angpt-1 and Tie2 expression and acted synergistically with reduced Angpt-1 in heterozygous dams (Angpt1+/−), to worsen birth outcomes by impeding vascular remodeling required for placental function. Interpretation: Collectively, these data support a mechanistic role for the Angpt-Tie2 axis in malaria in pregnancy, including a potential protective role for Angpt-1 in mitigating infection-associated adverse birth outcomes. Funding: This work was supported by the Canadian Institutes of Health Research (CIHR), Canada Research Chair, and Toronto General Research Institute Postdoctoral Fellowship Award. The parent trial was supported by the European & Developing Countries Clinical Trials Partnership and the Malaria in Pregnancy Consortium, which was funded by the Bill & Melinda Gates Foundation. The funders had no role in design, analysis, or reporting of these studies. |
| format |
article |
| author |
Vanessa Tran Andrea M. Weckman Valerie M. Crowley Lindsay S. Cahill Kathleen Zhong Ana Cabrera Robyn E. Elphinstone Victoria Pearce Mwayiwawo Madanitsa Linda Kalilani-Phiri Victor Mwapasa Carole Khairallah Andrea L. Conroy Feiko O. ter Kuile John G. Sled Kevin C. Kain |
| author_facet |
Vanessa Tran Andrea M. Weckman Valerie M. Crowley Lindsay S. Cahill Kathleen Zhong Ana Cabrera Robyn E. Elphinstone Victoria Pearce Mwayiwawo Madanitsa Linda Kalilani-Phiri Victor Mwapasa Carole Khairallah Andrea L. Conroy Feiko O. ter Kuile John G. Sled Kevin C. Kain |
| author_sort |
Vanessa Tran |
| title |
The Angiopoietin-Tie2 axis contributes to placental vascular disruption and adverse birth outcomes in malaria in pregnancy |
| title_short |
The Angiopoietin-Tie2 axis contributes to placental vascular disruption and adverse birth outcomes in malaria in pregnancy |
| title_full |
The Angiopoietin-Tie2 axis contributes to placental vascular disruption and adverse birth outcomes in malaria in pregnancy |
| title_fullStr |
The Angiopoietin-Tie2 axis contributes to placental vascular disruption and adverse birth outcomes in malaria in pregnancy |
| title_full_unstemmed |
The Angiopoietin-Tie2 axis contributes to placental vascular disruption and adverse birth outcomes in malaria in pregnancy |
| title_sort |
angiopoietin-tie2 axis contributes to placental vascular disruption and adverse birth outcomes in malaria in pregnancy |
| publisher |
Elsevier |
| publishDate |
2021 |
| url |
https://doaj.org/article/70589bcf3d034d399a3578776efe1f17 |
| work_keys_str_mv |
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