Objective To elucidate the etiology of DNA impairment of type Ⅱ alveolar epithelial cells(AT-II) of the rats fed with low selenium and high cadmium fodder，and the effect of Vitamin C.Methods With single cell gel electrophoresis technique，we observed the joint action of selenium，cadmium and vitamin C on DNA damage in AT-II cells of the eight groups of rats fed separately with：normal （2 groups），high Cd，high Cd+high VC，low Se+high Cd，low Se+high Cd+high VC，high Se+high Cd and high Se+high Cd+high VC fodder for 14 weeks.Results Compared with the control，there was no DNA changes have been observed in the high Se+high Cd+high VC group.However，in the high Se+high Cd group and high Cd+high VC group，DNA damage of AT-II cells can be detected clearly；in the low Se+high Cd+high VC group and high Cd group，the degree of the DNA damage is more serious than the above two groups；in the low Se+high Cd group，the extent of the DNA damage was the most serious on all of the groups be studied.Conclusion It is suggested that Se deficiency and simultaneously Cd overabundance may damaged DNA of AT-II cells of the rats significantly，however，Vitamin C may protect AT-II against the injury effectively.
ObjectiveTo systematically review the relationship between Cadmium (Cd) level and Alzheimer's disease (AD). MethodWe searched PubMed, EMbase, CNKI, WanFang Data and CBM databases from inception to December 2014 to collect case-control studies about the relationship between Cd level and AD. Two reviewers screened literature, extracted data and evaluated the risk of bias of included studies, and then meta-analysis was performed by using RevMan 5.3 software. ResultsA total of 11 studies were included, among them 8 studies were included into final meta-analysis. Three studies including 154 patients and 141 controls reported the relationship of serum Cd concentrations and AD, and the result of meta-analysis showed that the higher serum Cd level was found in the AD group than the control group (SMD=0.36, 95%CI 0.12 to 0.59, P=0.003). Six studies including 358 patients and 423 controls reported the relationship of blood Cd concentrations and AD, and the result of meta-analysis showed that there was no significant difference of blood Cd levels between both groups (SMD=0.35, 95%CI -0.14 to 0.84, P=0.16). ConclusionSerum Cd concentrations may be associated with AD, but blood Cd concentrations not. Due to the limitation of quality and quantity of the included studies, more high quality studies are needed to verify the above conclusion.
ObjectivesTo systematically review the relationship between cadmium exposure and the risk of hypertension.MethodsPubMed, EMbase, The Cochrane Library, CBM, WanFang Data, VIP and CNKI databases were searched online to collect studies of cadmium exposure and hypertension from inception to March 2018. Two reviewers independently screened literature, extracted data and assessed the risk of bias of included studies. Meta-analysis was then performed by Stata 12.0 software.ResultsA total of 9 studies were included, of which 19 841 cases were patients of hypertension, and 27 578 cases were in the control group. The results of meta-analysis showed that blood cadmium was associated with risk of hypertension (OR=1.23, 95%CI 1.17 to 1.30, P<0.001). However, no significant association was found between urinary cadmium and the risk of hypertension (OR=0.77, 95%CI 0.55 to 1.07,P=0.61). The results of subgroup analysis showed non-smokers (OR=1.19, 95%CI 1.09 to 1.31, P<0.001), males (OR=1.19, 95%CI 1.11 to 1.28,P<0.001), females (OR=1.28, 95%CI 1.18 to 1.40,P<0.001), yellow race (OR=1.26, 95%CI 1.19 to 1.34,P<0.001), and the literatures published after 2010 (OR=1.24, 95%CI 1.17 to 1.31,P<0.001) were associated with risk of hypertension in blood cadmium. The current smokers (OR=0.72, 95%CI 0.56 to 0.93,P=0.013), yellow race (OR=0.65, 95%CI 0.50 to 0.83, P=0.001), and the literatures published before 2010(OR=0.61, 95%CI 0.50 to 0.75, P<0.001) were associated with risk of hypertension in urinary cadmium.ConclusionsBlood cadmium is associated with risk of hypertension and high level of blood cadmium is a risk factor for hypertension. The levels of blood cadmium of non-smokers, males, females, yellow race are associated with risk of hypertension in blood cadmium. Urinary cadmium was not significantly associated with the risk of hypertension. The above conclusions are required to be verified by more high quality studies.
ObjectiveTo systematically review the relationship between cadmium (Cd) and childhood autism.MethodsPubMed, EMbase, Web of Science, The Cochrane Library, CNKI, VIP, WanFang Data and CBM were electronically searched to collect case-control studies on the relationship between Cd and childhood autism from inception to July 2019. Two reviewers independently screened literature, extracted data and assessed the risk of bias of included studies. Then, meta-analysis was performed by using RevMan 5.3 software.ResultsA total of 8 case-control studies were included. The results of meta-analysis showed that whether the specimen was from whole blood, urine or hair, there were no correlations between Cd and childhood autism (MDblood=0.17, 95% CI −0.06 to 0.39, P=0.15; MDurine=−0.43, 95%CI −1.44 to 0.58, P=0.4; MDhair=−0.08, 95%CI −0.52 to 0.36, P=0.72).ConclusionsCurrent evidence shows that Cd concentration is not correlated with autism in children. Due to limited quality and quantity of the included studies, more high quality studies are required to verify above conclusions.