N,N-Disubstituted 4-Sulfamoylbenzoic Acid Derivatives as Inhibitors of Cytosolic Phospholipase A2α: Synthesis, Aqueous Solubility, and Activity in a Vesicle and a Whole Blood Assay

Daniel      Borecki; Imke   Meyer zu   Vilsendorf; Jörg      Fabian; Matthias      Lehr

doi:10.2174/0115734064320241240709114041

Abstract

Background: Cytosolic phospholipase A2α (cPLA_2α) is the key enzyme that initiates the arachidonic acid cascade through which pro-inflammatory lipid mediators can be formed. Therefore, cPLA_2α is considered an interesting target for the development of anti-inflammatory drugs. Although several effective inhibitors of the enzyme have been developed, none of them has yet reached clinical application.

Objective: Recently, we have prepared new 4-sulfamoylbenzoic acid derivatives based on a cPLA_2α inhibitor found in a ligand-based virtual screening. The most effective of these compounds were now subjected to further variations in which the substitution pattern on the sulfamoyl nitrogen atom was changed..

Methods: The new compounds were tested in vitro in a vesicle assay for cPLA_2α inhibition as well as for their water solubility, metabolic stability, and selectivity towards related enzymes. In addition, they were evaluated ex vivo in a whole blood assay in which metabolites of the arachidonic acid cascade formed after activation of cPLA_2α were quantified using a combined online dilution/ online solid phase extraction HPLC-MS method.

Results: Inhibitors with submicromolar inhibitory in vitro potency were found with favourable water solubility and selectivity. However, their efficacy did not match that of the highly effective, known, structurally related cPLA_2α inhibitor giripladib, which was also tested as a reference. One advantage of some of the new compounds compared to giripladib was their significantly improved water solubility. When analyzing the substances in the ex vivo whole blood assay, it was found that the obtained inhibition data correlated better with the in vivo results when the phorbol ester 12-Otetradecanoylphorbol- 13-acetate was used for activation of the enzyme in the blood cells instead of the calcium ionophore A23187.

Conclusion: New compounds with good activity towards cPLA_2α and reasonable physicochemical properties were identified. Overall, the results obtained could be helpful in the development of clinically applicable inhibitors of this enzyme.

Keywords: Cytosolic phospholipase A_2α, inhibitor, aqueous solubility, selectivity, metabolic stability, whole blood assay, calcium ionophore A23187, phorbol ester.

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DOI https://dx.doi.org/10.2174/0115734064320241240709114041	Print ISSN 1573-4064
Publisher Name Bentham Science Publisher	Online ISSN 1875-6638

Medicinal Chemistry

N,N-Disubstituted 4-Sulfamoylbenzoic Acid Derivatives as Inhibitors of Cytosolic Phospholipase A_2α: Synthesis, Aqueous Solubility, and Activity in a Vesicle and a Whole Blood Assay

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Medicinal Chemistry

N,N-Disubstituted 4-Sulfamoylbenzoic Acid Derivatives as Inhibitors of Cytosolic Phospholipase A2α: Synthesis, Aqueous Solubility, and Activity in a Vesicle and a Whole Blood Assay

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N,N-Disubstituted 4-Sulfamoylbenzoic Acid Derivatives as Inhibitors of Cytosolic Phospholipase A_2α: Synthesis, Aqueous Solubility, and Activity in a Vesicle and a Whole Blood Assay