ABSTRACT
In recent years, the prevalence of childhood asthma has been increasing globally.As a common indoor pollutant, formaldehyde is involved in the pathogenesis of asthma, which has drawn increasing attention.However, the results of the current research have not been unified.Some studies have shown that asthma children live in indoor environments where the concentration of formaldehyde is significantly higher than that of healthy children.There are also reports showing that formaldehyde is not an independent risk factor for asthma.The exact results need to be further studied with a larger sample size.In addition, the article concludes the possible mechanism of formaldehyde on asthma from the perspectives of airway inflammation, acquired allergies, and enzymology, providing new ideas for the prevention and treatment of asthma.
ABSTRACT
Epigenetics refers to the heritable changes in gene expression without an alteration in the DNA sequence of the genome.Epigenetic mechanism involves DNA methylation,histone modification,chromatin remodeling,non-coding RNA regulation and so on.Many experimental investigations indicate that the abnormalities in epigenetic regulation during cardiac development may be responsible for the progression of congenital cardiac disease.Based on the four aspects of epigenetic regulation above,this review mainly discusses the advances of epigenetic mechanism of congenital heart disease.
ABSTRACT
Objective To observe the effects of different levels manganese (Mn) on spatial learning and memory in neonate rats.Methods Neonate rats were distributed to control (normal saline) and MnCl210,20,30mg/kg groups randomly.Each groups included 10 litters in a cage with a dam.Neonate rats were intraperitoneal injection exposed to MnCl2 over PND 1-21.All groups were evaluated behavioral performance using open field and Morris water maze.Blood and hippocampus Mn levels were determined using ICP-MS.Results 1) For each group,blood Mn were (35.58 ± 13.77) μg/L,(80.00 ± 12.98) μg/L,(238.51 ± 31.43) μg/L,(348.47 ±34.07) μg/L and hippocampus Mn were (576.82 ± 79.78) μg/g,(798.33 ± 40.60) μg/g,(1017.23 ± 117.23)μg/g,(1278.76 ± 281.48) μg/g respectively.Blood and hippocampus Mn concentrations in Mn-exposed groups were significant increased compared to control (P ＜ 0.01),and there was a positive correlation in blood Mn and hippocampus Mn(OR =0.91,95％ CI=0.81-0.96,P＜ 0.01).2) Therewere no significant differences on travelled distance in open field among all groups,which meant that Mn exposure had no effect on their locomotion.3) In the hidden platform trials of the Morris water maze test,only on 3rd day,Mn-expose groups spent more time to find the platform compared to the control(P ＜ 0.01).The average escape latency were(21.77 ± 7.10)s,(33.78 ± 9.95)s,(37.17 ± 13.68) s,(41.92 ± 16.74) s respectively.Though the latency were increased with the Mn exposure levels increasing among the Mn-expose groups,no statistically significant differences were observed.There were no statistically effects on latency to find the platform of all groups in other training days.The result in probe trails showed that there were no statistically effects on swimming velocity,the number of crossing over the former platform and the time spent in the targeted quadrant.Conclusion Mn exposure exerts effects on the learning,but no doseeffect relationship.There are no effects on memory of neonate rats of Mn exposure.