Cav-1 Protein Levels in Serum and Infarcted Brain Correlate with Hemorrhagic Volume in a Mouse Model of Thromboembolic Stroke, Independently of rt-PA Administration.

Abstract

Thrombolytic therapy with recombinant tissue plasminogen activator (rt-PA) is currently the only FDA-approved drug for acute ischemic stroke. However, its administration is still limited due to the associated increased risk of hemorrhagic transformation (HT). rt-PA may exacerbate blood-brain barrier (BBB) injury by several mechanisms that have not been fully elucidated. Caveolin-1 (Cav-1), a major structural protein of caveolae, has been linked to the endothelial barrier function. The effects of rt-PA on Cav-1 expression remain largely unknown. Here, Cav-1 protein expression after ischemic conditions, with or without rt-PA administration, was analyzed in a murine thromboembolic middle cerebral artery occlusion (MCAO) and in brain microvascular endothelial bEnd.3 cells subjected to oxygen/glucose deprivation (OGD). Our results show that Cav-1 is overexpressed in endothelial cells of infarcted area and in bEnd.3 cell line after ischemia but there is disagreement regarding rt-PA effects on Cav-1 expression between both experimental models. Delayed rt-PA administration significantly reduced Cav-1 total levels from 24 to 72 h after reoxygenation and increased pCav-1/Cav-1 at 72 h in the bEnd.3 cells while it did not modify Cav-1 immunoreactivity in the infarcted area at 24 h post-MCAO. Importantly, tissue Cav-1 positively correlated with Cav-1 serum levels at 24 h post-MCAO and negatively correlated with the volume of hemorrhage after infarction, the latter supporting a protective role of Cav-1 in cerebral ischemia. In addition, the negative association between baseline serum Cav-1 levels and hemorrhagic volume points to a potential usefulness of baseline serum Cav-1 levels to predict hemorrhagic volume, independently of rt-PA administration.

• Authors: Carme Gubern-Mérida, Pau Comajoan, Gemma Huguet, Isaac García-Yebenes, Ignacio Lizasoain, María Angeles Moro, Irene Puig-Parnau, Juan Manuel Sánchez, Joaquín Serena, Elisabet Kádár, Mar Castellanos
• Journal: Molecular neurobiology (Mol Neurobiol) Vol. 59 Issue 2 Pg. 1320-1332 (Feb 2022) ISSN: 1559-1182 [Electronic] United States
• PMID: 34984586 (Publication Type: Journal Article)
• Copyright: © 2022. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

Chemical References

• Cav1 protein, mouse
• Caveolin 1
• Tissue Plasminogen Activator

Topics

• Animals
• Brain (metabolism)
• Brain Ischemia (metabolism)
• Caveolin 1 (metabolism)
• Endothelial Cells (metabolism)
• Hemorrhage (complications)
• Infarction, Middle Cerebral Artery (complications, drug therapy, metabolism)
• Ischemic Stroke
• Mice
• Stroke (complications, drug therapy)
• Tissue Plasminogen Activator (pharmacology, therapeutic use)