Abstract
Cerebral ischemia is the primary basis of stroke, both sharing common pathogenic origins leading to irreversible brain damage if blood supply is not restored promptly. Existing evidence indicates that carbonic anhydrase (CA) inhibitors (CAIs) may impart therapeutic benefits against ischemia–reperfusion (I/R) pathology via the adenylyl cyclase-cyclic adenosine monophosphate (cAMP) pathway. We hypothesize that CAI and cAMP activation may enhance the therapeutic outcome against I/R conditions. In this investigation, the potential of dichlorphenamide (CAI) and the role of cAMP against ischemia–reperfusion injury were evaluated using a transient global cerebral I/R (tGCI/R) model. Swiss albino mice were subjected to bilateral common carotid artery occlusion (BCCAo) for 20 min and reperfusion (R) or sham surgery on day 1. Dichlorphenamide (DCPA, 20 mg/kg) and/or forskolin (cAMP agonist, 3 mg/kg) was administered intraperitoneally (i.p.) after BCCAo/R for 14 days. Results showed that tGCI/R impaired neurocognitive functions and lowered brain levels of cAMP and protein kinase A (PKA) that were ameliorated by DCPA and/or forskolin (FSK). DCPA and/or FSK attenuated tGCI/R-induced brain edema, blood–brain barrier dysfunction, oxidative-nitrosative stress, pro-inflammatory cytokines, acetylcholinesterase activity, cell death, and neurotransmitter imbalance (e.g., glutamate, γ-aminobutyric acid). The study showed that DCPA improved neurological and biochemical parameters against tGCI/R injury via cAMP-PKA-mediated activation of protective mechanisms. However, DCPA and FSK in combination showed much enhanced therapeutic outcomes against tGCI/R. Therefore, CA and cAMP present novel targets that may retard the progress of a transient ischemic attack to a full-blown stroke.
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The data used to support the findings of this study are available from the corresponding author upon a suitable request.
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MK contributed to conceptualization, design of methodology, supervision, project administration, data analysis, writing—original draft, writing—review & editing, and validation. KK was involved in investigation and data curation. TGS was involved in resources and data validation.
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The research protocol was approved by Institutional Animal Ethics Committee vide approval reference no. SSP/IAEC/2019/007 on date: 17-11-2019. Animals were housed within the institutional establishment (Animal House Facility) registered under CPCSEA (Regd. 1616/PO/Re/S/12/CPCSEA). All the animal tests were performed following the guiding principles of CPCSEA (Committee for the Purpose of Control and Supervision of Experiments on Animals), Ministry of Environment and Forests (Animal Welfare), Government of India (GOI), New Delhi.
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Kumar, M., Kaur, K. & Singh, T.G. Neuroprotective Effects of Carbonic Anhydrase Inhibition and Cyclic Adenosine Monophosphate Activation in Mouse Model of Transient Global Cerebral Ischemia and Reperfusion. Neuromol Med 25, 217–229 (2023). https://doi.org/10.1007/s12017-022-08728-9
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DOI: https://doi.org/10.1007/s12017-022-08728-9