Diabetes-associated cognitive dysfunction has already been attracted considerable attention.Advanced glycation end products(AGEs)from daily diets are thought to be a vital contributor to the development of this diseas...Diabetes-associated cognitive dysfunction has already been attracted considerable attention.Advanced glycation end products(AGEs)from daily diets are thought to be a vital contributor to the development of this diseases.However,the effect of one of the best-characterized exogenous AGEs N^(ε)-(carboxymethyl)lysine(CML)on cognitive function is not fully reported.In the present study,diabetical Goto-Kakizaki(GK)rats were treated with free CML for 8-weeks.It was found that oral consumption of exogenous CML significantly aggravated diabetes-associated cognitive dysfunction in behavioral test.In details,exogenous CML increased levels of oxidative stress,promoted the activation of glial cells in the brain,up-regulated the release of inflammatory cytokines interleukin-6,inhibited the protein expression of the brain-derived neurotrophic factor and thus led to neuroinflammation.Furthermore,exogenous CML promoted the amyloidogenesis in the brain of GK rats,and inhibited the expression of GLUT4.Additionally,several tricarboxylic acid cycle and glutamate-glutamine/γ-aminobutyric acid cycle intermediates including pyruvate,succinic acid,glutamine,glutamate were significantly changed in brain of GK rats treated with exogenous free CML.In conclusion,exogenous free CML is a potentially noxious compounds led to aggravated diabetes-associated cognitive dysfunction which could be possibly explained by its effects on neuroinflammation,energy and neurotransmitter amino acid homeostasis.展开更多
The 19 isomers of azafullerenes C 75 N + were studied with series of INDO methods. It was shown that the isomer in which the carbon atom near C 2(x) is substituted by the nitrogen atom is the most stable one. The nitr...The 19 isomers of azafullerenes C 75 N + were studied with series of INDO methods. It was shown that the isomer in which the carbon atom near C 2(x) is substituted by the nitrogen atom is the most stable one. The nitrogen atom has negative charge and may become a further center for reaction. The bands of the UV spectra of C 75 N + will be red shifted to 700-850 nm compared with those of C 76 . The nature of transition was assigned and the reason of red shift was also rationalized.展开更多
N 1-（2-Fursnidyl）-5-fluorouracil reacted with multimethylenes chlorohydrin in the presence of NaHCO3 in acetonitrile at 80 ℃ to give N 1-（2-furanidyl）-N 3-（hydroxyalkyl）-5-fulorouracils in a high yield （≥93%...N 1-（2-Fursnidyl）-5-fluorouracil reacted with multimethylenes chlorohydrin in the presence of NaHCO3 in acetonitrile at 80 ℃ to give N 1-（2-furanidyl）-N 3-（hydroxyalkyl）-5-fulorouracils in a high yield （≥93%）. Their cyclic glycerophospholipid conjugates were synthesized and had a good activity against the man urinary bladder cancer cell in vitro.展开更多
基金supported by the National Natural Science Foundation of China(32302258,32172317)Changsha Municipal Natural Science Foundation(kq2202223).
文摘Diabetes-associated cognitive dysfunction has already been attracted considerable attention.Advanced glycation end products(AGEs)from daily diets are thought to be a vital contributor to the development of this diseases.However,the effect of one of the best-characterized exogenous AGEs N^(ε)-(carboxymethyl)lysine(CML)on cognitive function is not fully reported.In the present study,diabetical Goto-Kakizaki(GK)rats were treated with free CML for 8-weeks.It was found that oral consumption of exogenous CML significantly aggravated diabetes-associated cognitive dysfunction in behavioral test.In details,exogenous CML increased levels of oxidative stress,promoted the activation of glial cells in the brain,up-regulated the release of inflammatory cytokines interleukin-6,inhibited the protein expression of the brain-derived neurotrophic factor and thus led to neuroinflammation.Furthermore,exogenous CML promoted the amyloidogenesis in the brain of GK rats,and inhibited the expression of GLUT4.Additionally,several tricarboxylic acid cycle and glutamate-glutamine/γ-aminobutyric acid cycle intermediates including pyruvate,succinic acid,glutamine,glutamate were significantly changed in brain of GK rats treated with exogenous free CML.In conclusion,exogenous free CML is a potentially noxious compounds led to aggravated diabetes-associated cognitive dysfunction which could be possibly explained by its effects on neuroinflammation,energy and neurotransmitter amino acid homeostasis.
文摘The 19 isomers of azafullerenes C 75 N + were studied with series of INDO methods. It was shown that the isomer in which the carbon atom near C 2(x) is substituted by the nitrogen atom is the most stable one. The nitrogen atom has negative charge and may become a further center for reaction. The bands of the UV spectra of C 75 N + will be red shifted to 700-850 nm compared with those of C 76 . The nature of transition was assigned and the reason of red shift was also rationalized.
文摘N 1-（2-Fursnidyl）-5-fluorouracil reacted with multimethylenes chlorohydrin in the presence of NaHCO3 in acetonitrile at 80 ℃ to give N 1-（2-furanidyl）-N 3-（hydroxyalkyl）-5-fulorouracils in a high yield （≥93%）. Their cyclic glycerophospholipid conjugates were synthesized and had a good activity against the man urinary bladder cancer cell in vitro.
