title: Chemoprevention of hepatocarcinogenesis with dietary isoprenic derivatives: cellular and molecular aspects.
abstract: Bioactive food components (BFACs) represent promising candidates for liver cancer chemoprevention. Among them, isoprenic derivatives (carotenoids, retinoids, perillyl alcohol, limonene, geraniol, farnesol, geranylgeraniol and β- ionone) can be highlighted. The relevance of animal models for the investigation of chemopreventive agents is supported by comparative functional genomic studies that reinforce the similarities between rodent and human hepatocarcinogenesis. Thus, characterization of BFACs in animal models as blocking and/or suppressing agents allows the establishment of the theoretical basis for the development of chemoprevention strategies. Dietary isoprenic derivatives actions on hepatocarcinogenesis may involve a block in carcinogen activation, induction of phase 2 enzymes and an antioxidant activity, as well as interference with cellular processes including cell communication, proliferation, apoptosis, differentiation and remodeling of preneoplastic lesions. Dietary isoprenic derivatives modulate molecular targets including HMG-CoA-reductase, Rho, nuclear receptors, c-myc, connexin 43, NF-κB and Nrf2. Several networks related to these targets are altered in early phases of hepatocarcinogenesis. This emphasizes the importance of such agents for the chemoprevention of hepatocellular carcinoma. Combinations of isoprenic derivatives or of these substances with other BFACs classes should be further investigated. Also, toxicity and bioavailability and pharmacokinetic aspects of these derivatives represent relevant issues in their development as chemopreventive agents. One major current limitation of the adoption of dietary isoprenic derivatives for liver cancer chemoprevention is the challenge in overcoming the initial preclinical phase in agent development. Dietary isoprenic derivatives that present liver cancer chemopreventive properties should be further explored in clinical trials, begining with the phase 0 approach.
authors.affiliation: Laboratory of Diet, Nutrition and Cancer, Department of Food and Experimental Nutrition, University of São Paulo, São Paulo, Brazil.
authors.forename: Thomas Prates
authors.initials: TP
authors.lastname: Ong
authors.forename: Monica Testoni
authors.initials: MT
authors.lastname: Cardozo
authors.forename: Aline
authors.initials: A
authors.lastname: de Conti
authors.forename: Fernando Salvador
authors.initials: FS
authors.lastname: Moreno
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000627:therapeutic use*; D002070:Butadienes / Q000737:chemistry / Q000627:therapeutic use*; D006528:Carcinoma, Hepatocellular / Q000378:metabolism / Q000473:pathology / Q000517:prevention & control*; D004032:Diet; D045782:Hemiterpenes / Q000737:chemistry / Q000627:therapeutic use*; D006801:Humans; D008113:Liver Neoplasms / Q000378:metabolism / Q000473:pathology / Q000517:prevention & control*; D058990:Molecular Targeted Therapy; D010420:Pentanes / Q000737:chemistry / Q000627:therapeutic use*
chemical_list: D000970:Antineoplastic Agents; D002070:Butadienes; D045782:Hemiterpenes; D010420:Pentanes; C005059:isoprene