title: (Meth)acrylate monomer-induced cytotoxicity and intracellular Ca(2+) mobilization in human salivary gland carcinoma cells and human gingival fibroblast cells related to monomer hydrophobicity.
abstract: To elucidate a possible link between the cytotoxicity and Ca(2+) mobilization by (meth)acrylates, we investigated the cell survival of and change in [Ca(2+)](i) in human salivary gland (HSG) cells (salivary gland carcinoma cell line) and human gingival fibroblasts (HGF) cells treated separately with 9 (meth)acrylate monomers used in dentistry. The cell survival was determined by the MTT method, and the [Ca(2+)](i) changes after the stimulation with the (meth)acrylate monomers were measured in floating indo-1/AM-loaded cells in Ca(2+)-free medium. For both HSG and HGF cells, the cytotoxicity of the monomers was approximately proportional to their hydrophobicity (logP). No increase in [Ca(2+)](i) was found with hydrophilic monomers, even with 10mm stimulation. [Ca(2+)](i) elevation by hydrophobic monomers occurred in a dose- and hydrophobic-dependent manner. The [Ca(2+)](i) change in HSG cells appeared as twin peaks, i.e., an initial sharp peak followed by a delayed broad one; whereas with the HGF cells only a single broad peak was seen, possibly dependent on their membrane quality. Pretreatment with n-butanol or methylmethacrylate enhanced the butylmethacrylate-induced [Ca(2+)](i) elevation, suggesting the [Ca(2+)](i) elevation by (meth)acrylate may be related to monomer hydrophobicity and cell type. The causal link between the cytotoxicity and [Ca(2+)](i) mobilization of monomers is discussed.
authors.affiliation: Department of Oral Physiology, Meikai University, School of Dentistry, 1-1, Keyakidai, Sakado, Saitama 350 0283, Japan. tosi@meikai.ac.jo
authors.forename: Toshiko
authors.initials: T
authors.lastname: Atsumi
authors.forename: S
authors.initials: S
authors.lastname: Fujisawa
authors.forename: K
authors.initials: K
authors.lastname: Tonosaki
mesh_terms: D000440:Butanols / Q000494:pharmacology; D002118:Calcium / Q000032:analysis / Q000378:metabolism*; D002277:Carcinoma; D002413:Cations, Divalent / Q000378:metabolism; D002470:Cell Survival; D002478:Cells, Cultured; D002648:Child; D003764:Dental Materials / Q000633:toxicity*; D005260:Female; D005347:Fibroblasts / Q000187:drug effects / Q000378:metabolism; D005881:Gingiva / Q000166:cytology / Q000187:drug effects*; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D008689:Methacrylates / Q000633:toxicity*; D012468:Salivary Gland Neoplasms; D012469:Salivary Glands / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D014407:Tumor Cells, Cultured
chemical_list: D000440:Butanols; D002413:Cations, Divalent; D003764:Dental Materials; D008689:Methacrylates; D002118:Calcium