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Molecular Interactions and Implications of Aldose Reductase Inhibition by PGA1 and Clinically Used Prostaglandins.

Abstract：

:Aldose reductase (AKR1B1) is a critical drug target because of its involvement in diabetic complications, inflammation, and tumorigenesis. However, to date, development of clinically useful inhibitors has been largely unsuccessful. Cyclopentenone prostaglandins (cyPGs) are reactive lipid mediators that bind covalently to proteins and exert anti-inflammatory and antiproliferative effects in numerous settings. By pursuing targets for modification by cyPGs we have found that the cyPG PGA1 binds to and inactivates AKR1B1. A PGA1-AKR1B1 adduct was observed, both by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry and by SDS-PAGE using biotinylated PGA1 (PGA1-B). Insight into the molecular interactions between AKR1B1 and PGA1 was advanced by molecular modeling. This anticipated the addition of PGA1 to active site Cys298 and the potential reversibility of the adduct, which was supported experimentally. Indeed, loss of biotin label from the AKR1B1-PGA1-B adduct was favored by glutathione, indicating a retro-Michael reaction, which unveils new implications of cyPG-protein interaction. PGA1 elicited only marginal inhibition of aldehyde reductase (AKR1A1), considered responsible for the severe adverse effects of many AKR1B1 inhibitors. Interestingly, other prostaglandins (PGs) inhibited the enzyme, including non-electrophilic PGE1 and PGE2, currently used in clinical practice. Moreover, both PGA1 and PGE1 reduced the formation of sorbitol in an ex-vivo model of diabetic cataract to an extent comparable to that attained by the known AKR inhibitor epalrestat. Taken together, these results highlight the role of PGs as AKR1B1 inhibitors and the interest in PG-related molecules as leads for the development of novel pharmacological tools.

journal_name

Mol Pharmacol

journal_title

Molecular pharmacology

authors

Díez-Dacal B,Sánchez-Gómez FJ,Sánchez-Murcia PA,Milackova I,Zimmerman T,Ballekova J,García-Martín E,Agúndez JA,Gharbi S,Gago F,Stefek M,Pérez-Sala D

doi

10.1124/mol.115.100693

subject

Has Abstract

pub_date

2016-01-01 00:00:00

pages

42-52

issue

1

eissn

0026-895X

issn

1521-0111

pii

mol.115.100693

journal_volume

89

pub_type

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