Investigations on detoxification mechanisms of novel para-phenylenediamine analogues through N-acetyltransferase 1 (NAT-1) View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2021-11-12

AUTHORS

Gopalakrishnan Venkatesan, Zhi Chiaw Lim, Aneesh V. Karkhanis, Yub Raj Neupane, Yuri Dancik, Chenyuan Huang, Paul Bigliardi, Giorgia Pastorin

ABSTRACT

Para-phenylenediamine (PPD) is one of the most used chemicals in oxidative hair dyes. However, its use has been associated with adverse effects on health, including contact dermatitis and other systemic toxicities. Novel PPD derivatives have been proposed as a safer replacement for PPD. This can be achieved if these molecules minimally permeate the skin and/or are easily metabolised by enzymes in the skin (e.g., N-acetyltransferase-1 (NAT-1)) into innocuous compounds before gaining systemic entry. This study investigated the detoxification pathway mediated by NAT-1 enzymes on 6 synthesized PPD analogues (namely, P1–P6) with different chemical properties, to study the role of functional groups on detoxification mechanisms in HaCaT skin cells. These compounds were carefully designed with different chemical properties (whereby the ortho position of PPD was substituted by nucleophile and electrophile groups to promote N-acetylation reactions, metabolism and clearance). Compounds P2–P4 N-acetylated at 54–49 nmol/mg/min, which is 1.6 times higher than N-acetylation of PPD, upregulated NAT-1 activity from 8–7% at 50 μM to 22–11% at 100 μM and showed 4 times higher rate of elimination (k equal to 0.141 ± 0.016–0.124 ± 0.01 h−1) and 3 times faster rate of clearance (0.172 ± 0.007–0.158 ± 0.005 h−1mgprotein−1) than PPD (0.0316 ± 0.0019 h−1, 0.0576 ± 0.003 h−1mg protein−1, respectively). The data suggest that nucleophile substituted compounds detoxify at a faster rate than PPD. Our metabolic and detoxification mechanistic studies revealed significantly higher rates of N-acetylation, NAT-1 activity and higher detoxification of P2–P4 in keratinocytes, suggesting the importance of nucleophilic groups at the ortho position in PPD to reduce toxicity of aniline-based dyes on human skin cells. More... »

PAGES

153-165

References to SciGraph publications

  • 2002-01-01. Pharmacogenetics of the arylamine N-acetyltransferases in THE PHARMACOGENOMICS JOURNAL
  • Identifiers

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    http://scigraph.springernature.com/pub.10.1007/s00204-021-03149-2

    DOI

    http://dx.doi.org/10.1007/s00204-021-03149-2

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    https://app.dimensions.ai/details/publication/pub.1142555513

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/34773126


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