The food colorant erythrosine is a promiscuous protein-protein interaction inhibitor

Lakshmi Ganesan, Emilio Margolles-Clark, Yun Song, Peter Buchwald

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Following our observation that erythrosine B (FD&C Red No. 3) is a relatively potent inhibitor of the TNF-R-TNFα and CD40-CD154 protein-protein interactions, we investigated whether this inhibitory activity extends to any other protein-protein interactions (PPI) as well as whether any other approved food colors possess such inhibitory activity. We found erythrosine, a poly-iodinated xanthene dye, to be a non-specific promiscuous inhibitor of a number of PPIs within the tumor necrosis factor superfamily (TNF-R-TNFα, CD40-CD154, BAFF-R-BAFF, RANK-RANKL, OX40-OX40L, 4-1BB-4-1BBL) as well as outside of it (EGF-R-EGF) with a remarkably consistent median inhibitory concentration (IC50) in the 2-20 μM (approximately 2-20 mg/L) range. In agreement with this, erythrosine also showed cellular effects including clear cytotoxic effects around this concentration range (IC50 ≈ 50 μM). Among the seven FDA-approved food colorants, only erythrosine showed consistent PPI inhibitory activity in the sub-100 μM range, which might also explain (at least partially) why it also has the lowest approved acceptable daily intake (ADI) (0.1 mg/kg body weight/day). Among a number of xanthene structural analogs of erythrosine tested for activity, rose Bengal, a food colorant approved in Japan, showed similar, maybe even more pronounced, promiscuous inhibitory activity, whereas fluorescein was inactive and gallein, phloxine, and eosin were somewhat active in some of the assays.

Original languageEnglish
Pages (from-to)810-818
Number of pages9
JournalBiochemical Pharmacology
Volume81
Issue number6
DOIs
StatePublished - Mar 15 2011

Fingerprint

Food Coloring Agents
Erythrosine
Xanthenes
Proteins
Epidermal Growth Factor
Inhibitory Concentration 50
Rose Bengal
No-Observed-Adverse-Effect Level
Eosine Yellowish-(YS)
Fluorescein
Assays
Japan
Coloring Agents
Color
Tumor Necrosis Factor-alpha
Body Weight
Food

Keywords

  • Erythrosine
  • Food color
  • THP-1 cells
  • TNF superfamily
  • Xanthene dyes

ASJC Scopus subject areas

  • Pharmacology
  • Biochemistry

Cite this

The food colorant erythrosine is a promiscuous protein-protein interaction inhibitor. / Ganesan, Lakshmi; Margolles-Clark, Emilio; Song, Yun; Buchwald, Peter.

In: Biochemical Pharmacology, Vol. 81, No. 6, 15.03.2011, p. 810-818.

Research output: Contribution to journalArticle

Ganesan, Lakshmi ; Margolles-Clark, Emilio ; Song, Yun ; Buchwald, Peter. / The food colorant erythrosine is a promiscuous protein-protein interaction inhibitor. In: Biochemical Pharmacology. 2011 ; Vol. 81, No. 6. pp. 810-818.
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