scholarly journals Cultured rat embryo accumulation of DNA, RNA, and protein following maternal administration of sodium arsenate

1982 ◽  
Vol 28 (1) ◽  
pp. 1-9 ◽  
Author(s):  
D.L. Fisher
Keyword(s):  
Sodium Arsenate ◽  
Rat Embryo ◽  
Maternal Administration

Morphometric Analysis of the Hepatocytes from Fish Exposed to Arsenic

1976 ◽  
Vol 34 ◽  
pp. 282-283
Author(s):  
Elsie M. B. Sorensen
Keyword(s):  
Morphometric Analysis ◽  
Arsenic Concentration ◽  
Ultrastructural Changes ◽  
Sodium Arsenate ◽  
Lepomis Cyanellus ◽  
Mammalian Counterpart ◽  
Intracellular Changes ◽  
Green Sunfish ◽  
Organic Pesticides

The detoxification capacity of the liver is well documented for a variety of substances including ethanol, organic pesticides, drugs, and metals. The piscean liver, although less enzymatically active than the mammalian counterpart (1), contains endoplasmic reticulum with an impressive repertoire of oxidizing, reducing, and conjugating abilities (2). Histopathologic changes are kncwn to occur in fish hepatocytes following in vivo exposure to arsenic (3); however, ultrastructural changes have not been reported. This study involved the morphometric analysis of intracellular changes in fish parynchymal hepatocytes and correlation with arsenic concentration in the liver.Green sunfish (Lepomis cyanellus, R.) were exposed to 0, 30, or 60 ppm arsenic (as sodium arsenate) at 20°C for 1, 2, or 3 week intervals before removal of livers for quantification of the arsenic burden (using neutron activation analysis) and morphometric analysis of ultrastructural alterations. Livers were cut into 1 mm cubes for fixation, dehydration, and embedding.

scholarly journals Normal and inhibited cholesterol synthesis in the cultured rat embryo.

1997 ◽  
Vol 38 (1) ◽  
pp. 22-34
Author(s):  
B Llirbat ◽  
C Wolf ◽  
F Chevy ◽  
D Citadelle ◽  
G Bereziat ◽  
...  
Keyword(s):  
Cholesterol Synthesis ◽  
Rat Embryo

An Interlaboratory Evaluation of Five Pairs of Teratogens and Non-teratogens in Post-implantation Rat Embryo Culture

1996 ◽  
Vol 24 (2) ◽  
pp. 201-209
Author(s):  
Aldert H. Piersma ◽  
Rudolf Bechter ◽  
Nathalie Krafft ◽  
Beat P. Schmid ◽  
Jeanne Stadler ◽  
...  
Keyword(s):  
Embryo Culture ◽  
Developmental Toxicity ◽  
Culture Method ◽  
Rat Embryo ◽  
Good Correspondence ◽  
Substituted Pyridines ◽  
Phthalic Ester ◽  
Rat Embryo Culture ◽  
Post Implantation

The usefulness of the post-implantation rat embryo culture method in screening xenobiotic compounds for developmental toxicity was validated in four laboratories with five pairs of compounds. This approach was chosen to provide information on the interlaboratory reproducibility of the results and to compare the effects of chemical analogues in embryo culture. By testing analogous compounds which are known to have different embryotoxic potencies in vivo, the discriminating power of the embryo culture method for the compound classes under study could be optimally assessed. The classes selected for testing were triazole antifungals, phthalic ester metabolites, substituted pyridines, sulphonamides and methylated xanthines. In summary, it was possible to distinguish between the compounds in three of the pairs, it was not possible to discriminate between the compounds of one pair, and it was possible to discriminate between the compounds of the other pair at two out of the four laboratories. The embryo culture results generally show a good correspondence with the embryotoxic properties of the compounds tested in vivo, although the embryo culture method appeared to be able to discriminate between only some of the pairs of chemical analogues. Some discrepancies may have arisen among the laboratories, because of methodological differences. These results suggest that the post-implantation rat embryo culture method may be a useful tool for screening xenobiotics within classes of compounds known to interfere with embryogenesis during the period of development represented in culture.

A culture system for the development of the preimplantation rat embryo

1994 ◽  
Vol 41 (2) ◽  
pp. 535-551 ◽  
Author(s):  
N. Ouhibi ◽  
J. Warren ◽  
J. English ◽  
N. Sullivan
Keyword(s):  
Culture System ◽  
Rat Embryo

scholarly journals Heat-induced expression of albumin during early stages of rat embryo development.

1987 ◽  
Vol 7 (12) ◽  
pp. 4599-4602 ◽  
Author(s):  
U K Srinivas ◽  
C J Revathi ◽  
M R Das
Keyword(s):  
Gene Expression ◽  
Heat Shock ◽  
Embryonic Liver ◽  
Rat Embryo ◽  
Adult Liver ◽  
Stages Of Development ◽  
Induced Expression ◽  
Molecular Events ◽  
Internal Change ◽  
Shock Proteins

An examination of heat-induced expression of proteins in tissues from adult and embryonic liver in rats shows that albumin, which is constitutively expressed in adult liver and is not synthesized in embryos before 16 days of gestation, appears in liver cells at earlier stages of development upon heat shock. On the basis of available evidence for the expression of heat shock proteins at distinct stages of development and on the basis of our findings, it may be argued that there could be common molecular events taking place during development and as a result of heat shock. We suggest also that one of the consequences of heat shock could be an internal change of pH within the cell which, in turn, might trigger alterations in gene expression.

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