Blood-Brain Barrier Rescue by Roflumilast After Transient Global Cerebral Ischemia in Rats.
Jéssica Mendes Bonato1, Bianca Andretto de Mattos1, Daniela Velasquez Oliveira1
1Department of Pharmacology and Therapeutics, State University of Maringá, Av. Colombo, CEP, 5790, 87020-900, Maringá, Paraná, Brazil.
Neurotoxicity Research
|March 16, 2023
Summary
Roflumilast, a phosphodiesterase 4 inhibitor, protected the brain
Area of Science:
- Neuroscience
- Pharmacology
- Biochemistry
Background:
- Phosphodiesterase 4 inhibitors (PDE4-I) increase cyclic adenosine monophosphate (cAMP) levels.
- PDE4-I demonstrate neuroprotective effects following neurological injuries that cause blood-brain barrier (BBB) damage, such as cerebral ischemia.
- Transient global cerebral ischemia (TGCI) is a significant cause of BBB disruption and subsequent neurodegeneration.
Purpose of the Study:
- To investigate the neuroprotective effects of roflumilast on the blood-brain barrier (BBB) in the hippocampus after transient global cerebral ischemia (TGCI) in a rat model.
- To determine if roflumilast can mitigate BBB disruption and preserve neuronal integrity following global ischemic injury.
Main Methods:
- Rats underwent transient global cerebral ischemia (TGCI) to induce BBB damage in the hippocampus.
- BBB integrity was assessed by measuring Evans blue (EB) and IgG extravasation.
- Levels of tight junction protein claudin-5 and endothelial nitric oxide synthase (eNOS) were quantified.
- Neurodegeneration and expression of Bcl-2 and NG2 were analyzed in the CA1 hippocampal subfield.
Main Results:
- TGCI caused significant BBB disruption, characterized by increased EB and IgG extravasation, neurodegeneration, and reduced claudin-5 and eNOS levels in the CA1 hippocampal subfield.
- Roflumilast treatment attenuated BBB disruption and restored eNOS levels in the hippocampus.
- Roflumilast increased the expression of Bcl-2 and NG2 in the CA1 subfield post-ischemia.
Conclusions:
- Roflumilast confers neuroprotection against transient global cerebral ischemia (TGCI)-induced blood-brain barrier (BBB) breakdown in the rat hippocampus.
- The protective mechanisms may involve preserving BBB integrity, promoting vascularization and angiogenesis, and facilitating myelin repair.
- Roflumilast shows potential as a therapeutic agent for ischemic stroke and other conditions involving BBB damage.
