Archives of Toxicology

, Volume 92, Issue 12, pp 3611–3612 | Cite as

Highlight report the food additive dammar resin is a rat hepatocarcinogen

  • Tarek EllethyEmail author
  • Mohamed Alsenbesy
  • Mohamed M. M. Hashem

Recently, Gi and colleagues from Osaka University in Japan published a 52-week chronic toxicity study and a 104-week carcinogenicity study of dammar resin in F344 rats (Gi et al. 2018). The authors demonstrated that hepatocellular adenomas and carcinomas were induced at 2% dietary concentrations of dammar resin, corresponding to 242 mg/kg b.w./day, while 0.5% (178 mg/kg b.w./day) was the no-observed-adverse-effect level (NOAEL).

The results of Gi and colleagues are of high relevance, since dammar resin is used as a food additive and flavoring substance in drinks, frozen desserts and in chewing gum (Gi et al. 2018; Cohen et al. 2017, USP 2012). It is produced as an exudate from trees of Agathis, Hopea or Shorea genera (Gi et al. 2018). For risk evaluation, it should be considered that the concentrations of dammar resin in food are orders of magnitude lower than the doses used in the present study (Gi et al. 2018). Moreover, dammar resin was negative in genotoxicity and mutagenicity tests, including chromosomal aberration tests and the mouse bone marrow micronucleus assay (Hayashi et al. 2000), suggesting that the compound acts as a non-genotoxic rat liver carcinogen. Therefore, studies are required to analyze whether dammar resin acts similarly in rat and human hepatocytes or there are major differences. In vitro cultures of primary hepatocytes represent a well-established tool for interspecies comparison (Vatakuti et al. 2017; Gu et al. 2018; Rodrigues et al. 2018; Arbo et al. 2016; Ghallab et al. 2016; Ghallab 2017a, b; Hammad 2013; Hammad et al. 2015). Readout comprises not only the cytotoxicity but also gene expression and hepatocellular functions (Deharde et al. 2016; Godoy et al. 2016, 2018; Jansen et al. 2017; Reif et al. 2015; Grinberg et al. 2014; Stöber 2016; Hammad et al. 2017, 2018). This is of interest, since dammar resin induces at least seven cytochrome P450 isoforms rodents in vivo and also generates reactive oxygen species in rat liver (Gi et al. 2018), key events known to be associated with non-genotoxic hepatocarcinogenesis (Cohen 2010; Hall et al. 2012; Leist et al. 2017; Godoy et al. 2013; Hewitt et al. 2007; Nwosu et al. 2017). Therefore, a comparison of these and similar endpoints, e.g. nuclear receptor activation, in rat and human hepatocytes will be an important step to improve the risk assessment of dammar resin as a food additive.


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Conflict of interest

The authors declare that they have no conflict of interest.


  1. Arbo MD, Melega S, Stöber R, Bastos M, Carmo H, Hengstler JG (2016) Hepatotoxicity of piperazine designer drugs: up-regulation of key enzymes of cholesterol and lipid biosynthesis. Arch Toxicol 90(12):3045–3060CrossRefGoogle Scholar
  2. Cohen SM (2010) Evaluation of possible carcinogenic risk to humans based on liver tumors in rodent assays: the two-year bioassay is no longer necessary. Toxicol Pathol 38(3):487–501. CrossRefPubMedGoogle Scholar
  3. Cohen SM, Fukushima S, Guengerich FP, Hecht SS, Rietjens IMCM, Smith RL (2017) GRAS flavoring substances 28.
  4. Deharde D, Schneider C, Hiller T, Pratschke J, Zeilinger K, Damm G (2016) Bile canaliculi formation and biliary transport in 3D sandwich-cultured hepatocytes in dependence of the extracellular matrix composition. Arch Toxicol 90(10):2497–2511. CrossRefPubMedGoogle Scholar
  5. Ghallab A (2017a) Highlight report: Metabolomics in hepatotoxicity testing. EXCLI J 16:1323–1325. CrossRefPubMedPubMedCentralGoogle Scholar
  6. Ghallab A (2017b) Highlight report: Monitoring cytochrome P450 activities in living hepatocytes. EXCLI J 16:1330–1331PubMedPubMedCentralGoogle Scholar
  7. Ghallab A, Cellière G, Henkel SG, Drasdo D, Gebhardt R, Hengstler JG (2016) Model-guided identification of a therapeutic strategy to reduce hyperammonemia in liver diseases. J Hepatol 64(4):860–871CrossRefGoogle Scholar
  8. Gi M, Fujioka M, Yamano S, Kitano M, Hayashi SM, Wanibuchi H (2018) Chronic dietary toxicity and carcinogenicity studies of dammar resin in F344 rats. Arch Toxicol. CrossRefPubMedGoogle Scholar
  9. Godoy P, Hewitt NJ, Albrecht U, Xu JJ, Yarborough KM, Hengstler JG (2013) Recent advances in 2D and 3D in vitro systems using primary hepatocytes, alternative hepatocyte sources and non-parenchymal liver cells and their use in investigating mechanisms of hepatotoxicity, cell signaling and ADME. Arch Toxicol 87(8):1315–1530. CrossRefPubMedPubMedCentralGoogle Scholar
  10. Godoy P, Widera A, Schmidt-Heck W et al (2016) Gene network activity in cultivated primary hepatocytes is highly similar to diseased mammalian liver tissue. Arch Toxicol 90(10):2513–2529. CrossRefPubMedPubMedCentralGoogle Scholar
  11. Godoy P, Schmidt-Heck W, Hellwig B, …Walter J, Blüthgen N, Hengstler JG (2018) Assessment of stem cell differentiation based on genome-wide expression profiles. Philos Trans R Soc Lond B Biol Sci 373(1750):20170221. CrossRefPubMedGoogle Scholar
  12. Grinberg M, Stöber RM, Edlund K, Leist M, Rahnenführer J, Hengstler JG (2014) Toxicogenomics directory of chemically exposed human hepatocytes. Arch Toxicol 88(12):2261–2287. CrossRefPubMedGoogle Scholar
  13. Gu X, Albrecht W, Edlund K, Han B, Hengstler JG, Stoeber R (2018) Relevance of the incubation period in cytotoxicity testing with primary human hepatocytes. Arch Toxicol. CrossRefPubMedGoogle Scholar
  14. Hall AP, Elcombe CR, Foster JR, Schulte A, Strauss V, York MJ (2012) Liver hypertrophy: a review of adaptive (adverse and non-adverse) changes–conclusions from the 3rd international ESTP expert workshop. Toxicol Pathol 40(7):971–994CrossRefGoogle Scholar
  15. Hammad S (2013) Advances in 2D and 3D in vitro systems for hepatotoxicity testing. EXCLI J 12:993–996PubMedPubMedCentralGoogle Scholar
  16. Hammad S, Abdel-Wareth AAA, El-Sayed Y (2015) In vitro-in vivo correlation: Hepatotoxicity testings. JEAAS 1(3):384–387Google Scholar
  17. Hammad S, Braeuning A, Meyer C, Mohamed FEZA, Hengstler JG, Dooley S (2017) A frequent misinterpretation in current research on liver fibrosis: the vessel in the center of CCl4-induced pseudolobules is a portal vein. Arch Toxicol 91(11):3689–3692. CrossRefPubMedGoogle Scholar
  18. Hammad S, Othman A, Meyer C, Amasheh S, Hengstler JG, Dooley S (2018) Confounding influence of tamoxifen in mouse models of Cre recombinase-induced gene activity or modulation. Arch Toxicol 92(8):2549–2561. CrossRefPubMedGoogle Scholar
  19. Hayashi M, Matsui M, Ishii K, Kawasaki M (2000) Environ Mutagen Res 22:27–44. (in Japanese). Accessed 10 Nov 2018
  20. Hewitt NJ, Lechón MJ, Houston JB, LeCluyse E, Groothuis GM, Hengstler JG (2007) Primary hepatocytes: current understanding of the regulation of metabolic enzymes and transporter proteins, and pharmaceutical practice for the use of hepatocytes in metabolism, enzyme induction, transporter, clearance, and hepatotoxicity studies. Drug Metab Rev 39(1):159–234CrossRefGoogle Scholar
  21. Jansen PL, Ghallab A, Vartak N, Reif R, Schaap FG, Hampe J, Hengstler JG (2017) The ascending pathophysiology of cholestatic liver disease. Hepatology 65(2):722–738CrossRefGoogle Scholar
  22. Leist M, Ghallab A, Graepel R, Kroese D, van de Water B, Hengstler JG (2017) Adverse outcome pathways: opportunities, limitations and open questions. Arch Toxicol 91(11):3477–3505. CrossRefPubMedGoogle Scholar
  23. Nwosu ZC, Megger DA, Hammad S, Sitek B, Roessler S, Ebert MP, Meyer C, Dooley S (2017) Identification of the consistently altered metabolic targets in human hepatocellular carcinoma. Cell Mol Gastroenterol Hepatol 4(2):303–323. CrossRefPubMedPubMedCentralGoogle Scholar
  24. Reif R, Karlsson J, Günther G, Kaye PM, Hengstler JG, Jirstrand M (2015) Bile canalicular dynamics in hepatocyte sandwich cultures. Arch Toxicol 89(10):1861–1870. CrossRefPubMedGoogle Scholar
  25. Rodrigues RM, Kollipara L, Chaudhari U, Vanhaecke T, Rogiers V, Vinken M (2018) Omics-based responses induced by bosentan in human hepatoma HepaRG cell cultures. Arch Toxicol 92(6):1939–1952. CrossRefPubMedPubMedCentralGoogle Scholar
  26. Stöber R (2016) Pathophysiology of cholestatic liver disease and its relevance for in vitro tests of hepatotoxicity. EXCLI J 15:870–871. CrossRefPubMedPubMedCentralGoogle Scholar
  27. USP (2012) Food chemicals codex, 8th edn. The United States Pharmacopeial Convention, Washington, DCGoogle Scholar
  28. Vatakuti S, Olinga P, Pennings JLA, Groothuis GMM (2017) Validation of precision-cut liver slices to study drug-induced cholestasis: a transcriptomics approach. Arch Toxicol 91(3):1401–1412. CrossRefPubMedGoogle Scholar

Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Tarek Ellethy
    • 1
    • 2
    Email author
  • Mohamed Alsenbesy
    • 3
  • Mohamed M. M. Hashem
    • 4
  1. 1.Radiotherapy Department, South Egypt Cancer InstituteAssiut UniversityAssiutEgypt
  2. 2.Radiotherapy DepartmentKlinikum Stuttgart - KatharinenhospitalStuttgartGermany
  3. 3.Department of Internal Medicine, Faculty of MedicineSouth Valley UniversityQenaEgypt
  4. 4.Pharmacology Department, Faculty of Veterinary MedicineCairo UniversityCairoEgypt

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