Sublethal pH decrease may cause genetic damage to eukaryotic cell: a study on sea urchins and Salmonella typhimurium
Further evidence is reported here of genetic and developmental damage that can be induced by a sublethal pH decrease. The effects of three inorganic acids (HCl, H2SO4, and H3PO4) on embryos and sperm from the sea urchins Sphaerechinus granularis and Paracentrotus lividus were evaluated. In addition,...
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Published in | Teratogenesis, carcinogenesis, and mutagenesis Vol. 6; no. 4; p. 275 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
1986
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Abstract | Further evidence is reported here of genetic and developmental damage that can be induced by a sublethal pH decrease. The effects of three inorganic acids (HCl, H2SO4, and H3PO4) on embryos and sperm from the sea urchins Sphaerechinus granularis and Paracentrotus lividus were evaluated. In addition, acidification of the medium was tested for spontaneous reversion to His+ prototrophy in Salmonella typhimurium (strains TA97, TA98, TA100, TA102, TA1535) up to toxic levels, by both liquid incubation and agar plate incorporation. The induction of developmental and mitotic abnormalities in S. granularis confirmed our previous observations on P. lividus. Embryotoxicity was exerted in S. granularis more severely by H3PO4 than by HCl or H2SO4 (pH 7 to 6), while the induction of mitotic abnormalities appeared at a pH of less than or equal to 6.5 irrespective of the acids used. By suspending S. granularis or P. lividus sperm in acidified filtered seawater (fsw) and then inseminating the eggs in natural fsw (pH = 8.0), the offspring showed developmental and mitotic abnormalities. Low-pH-induced spermiotoxicity was ruled out in our experiments, since fertilization success of acid-exposed sperm was actually enhanced, as compared to sperm suspended in untreated fsw. The exposure of S. typhimurium to different pH's (ranging from 4 to 9) invariably failed to induce any changes in reversion rates, regardless of the acids (or alkali) being used. These results suggest that extracellular acidification may cause sublethal damage that in turn leads to an impairment of mitotic activity and cell differentiation. |
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AbstractList | Further evidence is reported here of genetic and developmental damage that can be induced by a sublethal pH decrease. The effects of three inorganic acids (HCl, H2SO4, and H3PO4) on embryos and sperm from the sea urchins Sphaerechinus granularis and Paracentrotus lividus were evaluated. In addition, acidification of the medium was tested for spontaneous reversion to His+ prototrophy in Salmonella typhimurium (strains TA97, TA98, TA100, TA102, TA1535) up to toxic levels, by both liquid incubation and agar plate incorporation. The induction of developmental and mitotic abnormalities in S. granularis confirmed our previous observations on P. lividus. Embryotoxicity was exerted in S. granularis more severely by H3PO4 than by HCl or H2SO4 (pH 7 to 6), while the induction of mitotic abnormalities appeared at a pH of less than or equal to 6.5 irrespective of the acids used. By suspending S. granularis or P. lividus sperm in acidified filtered seawater (fsw) and then inseminating the eggs in natural fsw (pH = 8.0), the offspring showed developmental and mitotic abnormalities. Low-pH-induced spermiotoxicity was ruled out in our experiments, since fertilization success of acid-exposed sperm was actually enhanced, as compared to sperm suspended in untreated fsw. The exposure of S. typhimurium to different pH's (ranging from 4 to 9) invariably failed to induce any changes in reversion rates, regardless of the acids (or alkali) being used. These results suggest that extracellular acidification may cause sublethal damage that in turn leads to an impairment of mitotic activity and cell differentiation. |
Author | Giordano, G G Cipollaro, M Staiano, N Pagano, G Corsale, G Esposito, A Ragucci, E |
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SubjectTerms | Cells - drug effects Chromosome Aberrations - drug effects Eukaryotic Cells - drug effects Female Genes, Lethal - drug effects Hydrochloric Acid - pharmacology Hydrogen-Ion Concentration Male Mitosis - drug effects Mutagenicity Tests Phosphoric Acids - pharmacology Salmonella typhimurium - cytology Salmonella typhimurium - drug effects Salmonella typhimurium - genetics Sea Urchins - drug effects Sea Urchins - embryology Sea Urchins - genetics Spermatozoa - cytology Spermatozoa - drug effects Sulfuric Acids - pharmacology |
Title | Sublethal pH decrease may cause genetic damage to eukaryotic cell: a study on sea urchins and Salmonella typhimurium |
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