AIM: In order to detect risk factors for esophageal cancer,a national research program was carried out during the Eighth Five-Year Plan (from 1991 to 1995).
METHODS: Cixian County and Chichen County in Hebei Province ...AIM: In order to detect risk factors for esophageal cancer,a national research program was carried out during the Eighth Five-Year Plan (from 1991 to 1995).
METHODS: Cixian County and Chichen County in Hebei Province were selected as the index and the control for the study fields with higher or lower incidence of esophagus cancer in China, respectively. In these areas, we investigated the pollution of three nitrogenous compounds in well water for drinking and the use of nitrogen fertilizer in farming.
RESULTS: In well water, nitrate nitrogen, nitrite nitrogen and ammonia nitrogen were 8.77 mg/L, 0.014 mg/L and 0.009 mg/L in Cixian County in 1993, respectively. They were significantly higher than their levels (3.84 mg/L, 0.004 mg/L and 0.004 mg/L) in Chichen County (P＜0.01, t=6.281,t=3.784,t=3.775). There was a trend that the nitrogenous compounds in well water increased from 1993 to 1996.The amount of nitrogen fertilizer used in farming was 787.6 kg per hectare land in Cixian County in 1991, significantly higher than 186 kg per hectare in Chichen County (t=9.603,P＜0.001).
CONCLUSION: These investigations indicate that the poilution of nitrogenous compounds in well water for drinking is closely related to the use of nitrogen fertlizer in farming, and there is a significantly positive correlation between the level of three nitrogenous compounds in well water and the mortality ofesophageal cancer (correlation coefficient =0.5992). We suggest that improvement of well system for drinking water quality should be an effective measure for esophageal cancer prevention and control in rural areas.展开更多
AIM: To investigate the ornithine decarboxylase (ODC)gene expression in colorectal carcinoma, ODC mRNA was assayed by RT-PCR and ODC protein was detected by a monoclonal antibody against fusion of human colon ODC prep...AIM: To investigate the ornithine decarboxylase (ODC)gene expression in colorectal carcinoma, ODC mRNA was assayed by RT-PCR and ODC protein was detected by a monoclonal antibody against fusion of human colon ODC prepared by hybridoma technology.METHODS: Total RNA was extracted from human colorectal cancer tissues and their normal counterpart tissues. ODC mRNA levels were examined by RT-PCR.ODC genes amplified from RT-PCR were cloned into a prokaryotic vector pQE-30. The expressed proteins were purified by chromatography. Anti-ODC mAb was prepared with classical hybridoma techniques and used to determine the ODC expression in colon cancer tissues by immunohistochemical and Western blotting assay.RESULTS: A cell line, which could steadily secrete antiODC mAb, was selected through subcloning four times.Western blotting reconfirmed the mAb and ELISA showed that its subtype was IgG2a. RT-PCR showed that the ODC mRNA level increased greatly in colon cancer tissues (P＜0.01). Immunohistochemical staining showed that colorectal carcinoma cells expressed a significantly higher level of ODC than normal colorectal mucosa (98.6±1.03%vs 5.26±5%, P＜0.01).CONCLUSION: ODC gene overexpression is significantly related to human colorectal carcinoma. ODC gene expression may be a marker for the gene diagnosis and therapy of colorectal carcinoma.展开更多
The present paper employed density function theory to investigate two reaction pathways for isomerization of enol ester proposed by Yang(path a) and the present authors(path a), respectively. The base catalytic effect...The present paper employed density function theory to investigate two reaction pathways for isomerization of enol ester proposed by Yang(path a) and the present authors(path a), respectively. The base catalytic effects of solvent triethylamine on these two reactions were also evaluated. It is demonstrated that path B is more preferable than path a due to low barrier height for the rate-determining step.展开更多
OBJECTIVE To investigate the fast antidepressant effect and the underlying mechanism of it.METHODS C57BL/6 mice were exposed to a 6-week chronic unpredictable mild stress(CUMS)protocol,and treated with YY-23 or a posi...OBJECTIVE To investigate the fast antidepressant effect and the underlying mechanism of it.METHODS C57BL/6 mice were exposed to a 6-week chronic unpredictable mild stress(CUMS)protocol,and treated with YY-23 or a positive drug fluoxetine in the last 3weeks,behavioral assessments proceed every week.NMDA-induced current were recorded by whole-cell patch clamp on dissociated hippocampal CA1 neurons of Sprague-Dawley rats.Phosphorylation of the signaling proteins was evaluated by Western blotting.RESULTS The electrophysiological results showed that YY-23 is a non-competitive NMDA receptor antagonist,neither in′use-dependent′nor′voltage-dependent′way,with no prominent effect on AMPA induced current.This antagonism of YY-23 could be partially prevented by proven blockers MK801 and Mg2+,laterally indicating the nature of NMDA receptor antagonist both pharmacologically and physiologically.Behavioral and Biochemical study showed that YY-23 could act as antidepressant and exerted strong inhibitory effect on GSK3β in PFC of CMS depression mice model.CONCLUSION YY-23 showed promising antidepressant effect with rapid onset,which might be related to NMDA receptor antagonism and GSK3β inhibition.展开更多
Since pig is an important livestock species worldwide, its gene expressionhas been investigated intensively, but rarely in brain. In order to study gene expression profilesin the pig central nervous system, we sequenc...Since pig is an important livestock species worldwide, its gene expressionhas been investigated intensively, but rarely in brain. In order to study gene expression profilesin the pig central nervous system, we sequenced and analyzed 43,122 high-quality 5'' end expressedsequence tags (ESTs) from porcine cerebellum, cortex cerebrum, and brain stem cDNA libraries,involving several different prenatal and postnatal developmental stages. The initial ESTs wereassembled into 16,101 clusters and compared to protein and nucleic acid databases in GenBank. Ofthese sequences, 30.6% clusters matched protein databases and represented function known sequences;75.1% had significant hits to nucleic acid databases and partial represented known function; 73.3%matched known porcine ESTs; and 21.5% had no matches to any known sequences in GenBank. We used thecategories defined by the Gene Ontology to survey gene expression in the porcine brain.展开更多
文摘AIM: In order to detect risk factors for esophageal cancer,a national research program was carried out during the Eighth Five-Year Plan (from 1991 to 1995).
METHODS: Cixian County and Chichen County in Hebei Province were selected as the index and the control for the study fields with higher or lower incidence of esophagus cancer in China, respectively. In these areas, we investigated the pollution of three nitrogenous compounds in well water for drinking and the use of nitrogen fertilizer in farming.
RESULTS: In well water, nitrate nitrogen, nitrite nitrogen and ammonia nitrogen were 8.77 mg/L, 0.014 mg/L and 0.009 mg/L in Cixian County in 1993, respectively. They were significantly higher than their levels (3.84 mg/L, 0.004 mg/L and 0.004 mg/L) in Chichen County (P＜0.01, t=6.281,t=3.784,t=3.775). There was a trend that the nitrogenous compounds in well water increased from 1993 to 1996.The amount of nitrogen fertilizer used in farming was 787.6 kg per hectare land in Cixian County in 1991, significantly higher than 186 kg per hectare in Chichen County (t=9.603,P＜0.001).
CONCLUSION: These investigations indicate that the poilution of nitrogenous compounds in well water for drinking is closely related to the use of nitrogen fertlizer in farming, and there is a significantly positive correlation between the level of three nitrogenous compounds in well water and the mortality ofesophageal cancer (correlation coefficient =0.5992). We suggest that improvement of well system for drinking water quality should be an effective measure for esophageal cancer prevention and control in rural areas.
基金Supported by the Scientific Research Fund of National Ministry of Health, No. 98-1-173
文摘AIM: To investigate the ornithine decarboxylase (ODC)gene expression in colorectal carcinoma, ODC mRNA was assayed by RT-PCR and ODC protein was detected by a monoclonal antibody against fusion of human colon ODC prepared by hybridoma technology.METHODS: Total RNA was extracted from human colorectal cancer tissues and their normal counterpart tissues. ODC mRNA levels were examined by RT-PCR.ODC genes amplified from RT-PCR were cloned into a prokaryotic vector pQE-30. The expressed proteins were purified by chromatography. Anti-ODC mAb was prepared with classical hybridoma techniques and used to determine the ODC expression in colon cancer tissues by immunohistochemical and Western blotting assay.RESULTS: A cell line, which could steadily secrete antiODC mAb, was selected through subcloning four times.Western blotting reconfirmed the mAb and ELISA showed that its subtype was IgG2a. RT-PCR showed that the ODC mRNA level increased greatly in colon cancer tissues (P＜0.01). Immunohistochemical staining showed that colorectal carcinoma cells expressed a significantly higher level of ODC than normal colorectal mucosa (98.6±1.03%vs 5.26±5%, P＜0.01).CONCLUSION: ODC gene overexpression is significantly related to human colorectal carcinoma. ODC gene expression may be a marker for the gene diagnosis and therapy of colorectal carcinoma.
文摘The present paper employed density function theory to investigate two reaction pathways for isomerization of enol ester proposed by Yang(path a) and the present authors(path a), respectively. The base catalytic effects of solvent triethylamine on these two reactions were also evaluated. It is demonstrated that path B is more preferable than path a due to low barrier height for the rate-determining step.
基金The project supported by the National Natural Science Foundation(31128009,31171011)the National Science&Technology Major Project″Key New Drug Creation and Manufacturing Program″(2014ZX09102-001-005)the Ministry of Science and Technology(2013CB910601)
文摘OBJECTIVE To investigate the fast antidepressant effect and the underlying mechanism of it.METHODS C57BL/6 mice were exposed to a 6-week chronic unpredictable mild stress(CUMS)protocol,and treated with YY-23 or a positive drug fluoxetine in the last 3weeks,behavioral assessments proceed every week.NMDA-induced current were recorded by whole-cell patch clamp on dissociated hippocampal CA1 neurons of Sprague-Dawley rats.Phosphorylation of the signaling proteins was evaluated by Western blotting.RESULTS The electrophysiological results showed that YY-23 is a non-competitive NMDA receptor antagonist,neither in′use-dependent′nor′voltage-dependent′way,with no prominent effect on AMPA induced current.This antagonism of YY-23 could be partially prevented by proven blockers MK801 and Mg2+,laterally indicating the nature of NMDA receptor antagonist both pharmacologically and physiologically.Behavioral and Biochemical study showed that YY-23 could act as antidepressant and exerted strong inhibitory effect on GSK3β in PFC of CMS depression mice model.CONCLUSION YY-23 showed promising antidepressant effect with rapid onset,which might be related to NMDA receptor antagonism and GSK3β inhibition.
基金This work was supported by the National High-Tech Research and Development Program of China (No.2002AA229061)the Major Knowledge Innovation Programs of the Chinese Academy of Sciences (No.KSCX1-01).
文摘Since pig is an important livestock species worldwide, its gene expressionhas been investigated intensively, but rarely in brain. In order to study gene expression profilesin the pig central nervous system, we sequenced and analyzed 43,122 high-quality 5'' end expressedsequence tags (ESTs) from porcine cerebellum, cortex cerebrum, and brain stem cDNA libraries,involving several different prenatal and postnatal developmental stages. The initial ESTs wereassembled into 16,101 clusters and compared to protein and nucleic acid databases in GenBank. Ofthese sequences, 30.6% clusters matched protein databases and represented function known sequences;75.1% had significant hits to nucleic acid databases and partial represented known function; 73.3%matched known porcine ESTs; and 21.5% had no matches to any known sequences in GenBank. We used thecategories defined by the Gene Ontology to survey gene expression in the porcine brain.
