Plumbagin-Serum Albumin Interaction: Spectral, Electrochemical, Structure-Binding Analysis, Antiproliferative and Cell Signaling Aspects with Implications for Anticancer Therapy.

Abstract:

:Plumbagin (5-hydroxy-2-methyl-1,4-naphthoquinone) is a small molecule with potent anticancer activity. Like other 1,4-naphthoquinones, it exhibits electrophilic reactivity towards biological nucleophiles. We demonstrate that plumbagin and structurally related 1,4-naphthoquinones with at least one unsubstituted quinoid carbon (C2 or C3) bind to albumin, an ubiquitously present nucleophile, with minimum recovery of free drug. Extraction recovery of plumbagin from albumin in solution showed one-phase exponential decline with a half-live of 9.3 min at 10 μmol/L. In the presence of albumin, plumbagin exhibited instant changes in UV/Vis absorption bands. Electrochemical analysis using cyclic voltammetry showed a decrease in redox peak currents over time until electro-inactivity, thus suggesting the formation of a supramolecular adduct inaccessible for electron transfer. The adduct inhibited cell growth and caused cell-cycle arrest of prostate cancer cells, in part by decreasing levels of the cell-cycle regulator RBBP. The conjugate displayed similar cellular effects to those described for plumbagin, such as decreased levels of androgen receptor and protein kinase C epsilon. The effect of plumbagin-albumin on cancer cells was species-specific, suggesting a receptor-mediated mechanism. Furthermore, it was blocked by cathepsin inhibitor pepstatin A, indicating that lysosomal degradation is involved in the processing of plumbagin-albumin adduct. The spontaneously formed adduct of plumbagin with serum albumin is likely to mediate the biological activities of plumbagin in vivo and to fundamentally influence its pharmacodynamics.

journal_name

ChemMedChem

journal_title

ChemMedChem

authors

Chrastina A,Welsh J,Rondeau G,Abedinpour P,Borgström P,Baron VT

doi

10.1002/cmdc.202000157

subject

Has Abstract

pub_date

2020-07-20 00:00:00

pages

1338-1347

issue

14

eissn

1860-7179

issn

1860-7187

journal_volume

15

pub_type

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