Abstract
Severe inflammatory stress often leads to vessel rarefaction and fibrosis, resulting in limited tissue recovery. However, signaling pathways mediating these processes are not completely understood. Patients with ischemic and inflammatory conditions have increased systemic Activin A level, which frequently correlates with the severity of pathology. Yet, Activin A’s contribution to disease progression, specifically to vascular homeostasis and remodeling, is not well defined. This study investigated vasculogenesis in an inflammatory environment with an emphasis on Activin A’s role. Exposure of endothelial cells (EC) and perivascular cells (adipose stromal cells, ASC) to inflammatory stimuli (represented by blood mononuclear cells from healthy donors activated with lipopolysaccharide, aPBMC) dramatically decreased EC tubulogenesis or caused vessel rarefaction compared to control co-cultures, concurrent with increased Activin A secretion. Both EC and ASC upregulated Inhibin Ba mRNA and Activin A secretion in response to aPBMC or their secretome. We identified TNFα (in EC) and IL-1β (in EC and ASC) as the exclusive inflammatory factors, present in aPBMC secretome, responsible for induction of Activin A. Similar to ASC, brain and placental pericytes upregulated Activin A in response to aPBMC and IL-1β, but not TNFα. Both these cytokines individually diminished EC tubulogenesis. Blocking Activin A with neutralizing IgG mitigated detrimental effects of aPBMC or TNFα/IL-1β on tubulogenesis in vitro and vessel formation in vivo. This study delineates the signaling pathway through which inflammatory cells have a detrimental effect on vessel formation and homeostasis, and highlights the central role of Activin A in this process. Transitory interference with Activin A during early phases of inflammatory or ischemic insult, with neutralizing antibodies or scavengers, may benefit vasculature preservation and overall tissue recovery.
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Data availability
All data generated or analyzed during this study are included in this published article.
Abbreviations
- EC:
-
Endothelial cell
- CBEC:
-
Cord-blood endothelial cell
- HUVEC:
-
Human umbilical vein endothelial cell
- HMVEC:
-
Human cardiac microvascular endothelial cell
- ASC:
-
Adipose stromal cells
- PBMC:
-
Peripheral blood mononuclear cells
- aPBMC:
-
Activated peripheral blood mononuclear cells
- TNFα:
-
Tumor necrosis factor alpha
- IL-1β:
-
Interleukin-1 beta
- IFNγ:
-
Interferon gamma
- IL-6:
-
Interleukin 6
- LPS:
-
Lipopolysaccharide
- FST:
-
Follistatin
- FSTL3:
-
Follistatin-like 3
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Acknowledgements
We would like to thank Drs. Anjelica Gonzalez and Catherine Kim (Yale University) for providing human placental pericytes, as well as Dr. Erika Moore and Holly Ryan (University of Florida) for providing human brain pericytes.
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This research was funded by Gatorade Foundation.
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SMS and SMC: Conception and design, Collection and/or assembly of data, Data analysis and interpretation, Manuscript writing YG: Collection and/or assembly of data KLM: Data interpretation, Financial support DOT: Conception and design, Collection and/or assembly of data, Data analysis and interpretation, Financial support, Manuscript writing, Final approval of manuscript.
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Manohar-Sindhu, S., Merfeld-Clauss, S., Goddard, Y. et al. Diminished vasculogenesis under inflammatory conditions is mediated by Activin A. Angiogenesis 26, 423–436 (2023). https://doi.org/10.1007/s10456-023-09873-w
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DOI: https://doi.org/10.1007/s10456-023-09873-w