Helmholtz Gemeinschaft


Vascular and liver homeostasis in juvenile mice require endothelial cyclic AMP-dependent protein kinase A

PDF (Original Article) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
[img] Other (Supplementary Materials)

Item Type:Article
Title:Vascular and liver homeostasis in juvenile mice require endothelial cyclic AMP-dependent protein kinase A
Creators Name:Nedvetsky, P.I. and Cornelissen, I. and Mathivet, T. and Bouleti, C. and Ou, P. and Baatsen, P. and Zhao, X. and Schuit, F. and Stanchi, F. and Mostov, K.E. and Gerhardt, H.
Abstract:During vascular development, endothelial cAMP-dependent protein kinase A (PKA) regulates angiogenesis by controlling the number of tip cells, and PKA inhibition leads to excessive angiogenesis. Whether this role of endothelial PKA is restricted to embryonic and neonatal development or is also required for vascular homeostasis later on is unknown. Here, we show that perinatal (postnatal days P1-P3) of later (P28-P32) inhibition of endothelial PKA using dominant-negative PKA expressed under the control of endothelial-specific Cdh5-CreERT2 recombinase (dnPKA(iEC) mice) leads to severe subcutaneous edema, hypoalbuminemia, hypoglycemia and premature death. These changes were accompanied by the local hypersprouting of blood vessels in fat pads and the secondary enlargement of subcutaneous lymphatic vessels. Most noticeably, endothelial PKA inhibition caused a dramatic disorganization of the liver vasculature. Hepatic changes correlated with decreased gluconeogenesis, while liver albumin production seems to be unaffected and hypoalbuminemia is rather a result of increased leakage into the interstitium. Interestingly, the expression of dnPKA only in lymphatics using Prox1-CreERT2 produced no phenotype. Likewise, the mosaic expression in only endothelial subpopulations using Vegfr3-CreERT2 was insufficient to induce edema or hypoglycemia. Increased expression of the tip cell marker ESM1 indicated that the inhibition of PKA induced an angiogenic response in the liver, although tissue derived pro- and anti-angiogenic factors were unchanged. These data indicate that endothelial PKA is a gatekeeper of endothelial cell activation not only in development but also in adult homeostasis, preventing the aberrant reactivation of the angiogenic program.
Keywords:Angiogenesis, Edema, Liver Sinusoidal Endothelium, Animals, Mice
Source:International Journal of Molecular Sciences
Page Range:11419
Date:27 September 2022
Official Publication:https://doi.org/10.3390/ijms231911419
PubMed:View item in PubMed

Repository Staff Only: item control page


Downloads per month over past year

Open Access
MDC Library