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531.
Because we found that WTC rats might be resistant to streptozotocin (STZ), we have elucidated the mechanisms of resistant to the diabetogenic effects of STZ in the WTC rats. Dose response to STZ was evaluated with glucose levels. No significant changes in glucose level to STZ administration were observed in WTC rats. Insulin secretion by suppling glucose was preserved in WTC rats even after STZ administration. Although there was no significant difference in gene expression of both GLUT2 and Kir6.2, which were involved in STZ resistance, between WTC rats and Wistar rats, the expression of metallothionein 2a in pancreas and liver to STZ administration of WTC rats was significantly higher than that of Wistar rats. Moreover, alloxan did not induce diabetes in WTC rats as same as STZ. These results suggest that WTC rats might have powerful antioxidant property to protect β cells in pancreas. Because the STZ-resistant property is very close characteristics to human beings, WTC rats will become a useful animal model in diabetic researches. 相似文献
532.
K Takahashi K Maita M Kuwahara T Harada R R Maronpot 《Virchows Archiv. B, Cell pathology including molecular pathology》1992,62(2):89-95
Lectin binding patterns in ten mouse malignant fibrous histiocytoma (MFH)-like sarcomas containing eosinophilic globule (EG) cells and in granular metrial gland (GMG) cells of mouse placenta were stained with nine lectins (Con A, LCA, WGA, DBA, SBA, e-PHA, PNA, RCA-I and UEA-I) by an avidin-biotin-peroxidase-complex method. EG cells stained strongly with DBA, SBA and PNA which are specific for N-acetyl-D-galactosamine and/or D-galactose. DBA and SBA bound throughout the cytoplasm including the globules; PNA reacted preferentially at the cell surface. There was no evidence that these three lectins were reactive for immature EG cells. WGA, RCA-I and e-PHA also gave a slightly to moderately positive reaction to globules of EG cells. The results indicate that the globules contain abundant O-linked sequences of sugars, but also a few N-linked residues. MFH tumor cells showed a variable degree of binding with Con A, RCA-I, and WGA, but did not react with DBA, SBA and PNA. On the other hand, GMG cells exhibited specific affinities for DBA, SBA and PNA with staining patterns similar to those of EG cells. These findings suggest that EG and GMG cells may be of the same cellular lineage. 相似文献
533.
To clarify the effect of acetylcholinesterase (AChE) on the pathogenesis of airway hyperresponsiveness, AChE activities in tracheal smooth muscle and lung tissue from congenitally bronchial-hypersensitive (BHS) and bronchial-hyposensitive (BHR) guinea pigs were compared. For this purpose, AChE activities were determined by measuring the rate of absorbance of tissue homogenate. Relative amounts of AChE mRNA were also evaluated by the RT-PCR method. In both tracheal smooth muscle and lung tissue from BHS, the AChE activity and the relative amount of AChE mRNA were less than those in BHR. These results suggest that the reduced AChE activity is at least a candidate for inducing airway hyperresponsiveness. 相似文献
534.
Cochliobolus heterostrophus Pol2 and Pol5 mutants are pleiotropic, and each mutant gene is responsible for alterations of both unrelated phenotypes: reddish-brown pigmentation
and polyoxin resistance. The three pigments accumulated in these mutants were isolated. Structural characterization by spectroscopic
analyses indicated that these three pigments were polyhydroxyanthraquinones: emodin, chrysophanol, and citreorosein. Emodin
is known to be an antidote against benzimidazole fungicide, although no antidoting activity against polyoxin was observed.
Received: February 12, 2002 / Accepted: April 27, 2002 相似文献
535.
536.
S Kitahata K Hara K Fujita H Nakano N Kuwahara K Koizumi 《Bioscience, biotechnology, and biochemistry》1992,56(9):1386-1391
Bacillus stearothermophilus CGTase had a wider acceptor specificity than Bacillus macerans CGTase did and produced large amounts of transfer products of various acceptors such as D-galactose, D-mannose, D-fructose, D- and L-arabinose, D- and L-fucose, L-rhamnose, D-glucosamine, and lactose, which were inefficient acceptors for B. macerans CGTase. The main component of the smallest transfer products of lactose was assumed to be alpha-D-glucosyl O-beta-D-galactosyl-(1----4)-beta-D-glucoside. 相似文献
537.
In combination with copper(II) ion and 365 nm-light, anti-tumor alkaloid camptothecin produced remarkable DNA strand scission. The DNA sequencing analysis revealed considerably random nucleotide sequence cleavage. The present DNA breakage reaction was strongly inhibited by catalase and bathocuproine, but not by superoxide dismutase, mannitol, and 1,4-diazabicyclo-[2.2.2]octane. The camptothecin-Cu(II)-UV light system also clearly induced bacteriophage-inactivation which is associated with the DNA degradation. On the basis of the experimental results, the reaction mechanism for the present DNA cleavage has been discussed. 相似文献
538.
539.
540.
Tetramethylbenzidine method for monitoring the free available chlorine and microbicidal activity of chlorite‐based sanitizers under organic‐matter‐rich environments
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