Search | Engineering

订阅投稿

首页工程期刊工程焦点工程成就工程前沿关于我们 English

资源类型

期刊论文 3

年份

2021 1

2015 1

2012 1

关键词

染色体异常 1

细胞遗传学 1

自然流产 1

检索范围：

排序：展示方式：

Assessing combined toxic effects of tetracycline and P25 titanium dioxide nanoparticles using

Barsha Roy, Khushboo Kadam, Suresh Palamadai Krishnan, Chandrasekaran Natarajan, Amitava Mukherjee

《环境科学与工程前沿（英文）》 2021年第15卷第1期 doi: 10.1007/s11783-020-1298-x

摘要： Abstract • UVA pre-irradiation to TiO2 NPs enhanced its toxicity toward plant A. cepa. • UVA TiO2 NPs increased intracellular ROS, resulting in more cell damage. • Cell death enhanced cell permeability and increased uptake of NPs. • Being highly toxic (EC50 = 0.097 µmol/L), TC did not increase ROS generation. • Even at a low dose, TC enhanced the toxic potential of TiO2 NPs significantly. Usage of titanium dioxide nanoparticles (TiO2 NPs) and tetracycline (TC) has increased significantly in the present era. This leads to their release and accumulation in the environment. Both the compounds, individually, can have adverse toxic effects on the plants. Their binary mixtures can increase this degree of damage. The present study aimed to evaluate the toxicity of both the contaminants in individual and binary mixtures in Allium cepa. Further, the toxicity of TiO2 NPs upon UVA pre-irradiation was also measured. Results showed that UVA pre-irradiated NPs (UVA-TiO2 NPs) had a significant decrease in cell viability than their non-irradiated counterparts (NI-TiO2), denoting an increase in photocatalytic activity upon UVA pre-irradiation. Very low concentrations of TC (EC10 = 0.016 µmol/L) mixed with TiO2 NPs significantly increased the toxicity for both UVA-TiO2 and NI-TiO2 NPs. Intracellular ROS generation was significantly high for UVA-TiO2 NPs. However, TC did not have any effects on ROS production. Both the compounds exhibited genotoxic potential in A. cepa. Different chromosomal abnormalities like anaphase bridges, telophase bridges, laggard chromosomes, binucleate cells, etc. were observed. The binary mixture of UVA-TiO2 NPs and TC showed the highest chromosomal aberrations (64.0%±1.26%) than the mixture with NI-TiO2 or the individual contaminants. This decreased significantly after recovery (46.8%±1.92%), denoting the self-repair processes. This study proved that UVA-TiO2 NPs were more toxic and could be enhanced further when mixed with a sub-lethal concentration of TC. This work will help to assess the risk of both compounds in the environment.

关键词： Binary toxicity Cell viability Mitotic index Chromosomal aberration Reactive oxygen species Nanoparticles internalization

HTML PDF 收藏

Mechanisms and impacts of chromosomal translocations in cancers

null

《医学前沿（英文）》 2012年第6卷第3期页码 263-274 doi: 10.1007/s11684-012-0215-5

摘要：

Chromosomal aberrations have been associated with cancer development since their discovery more than a hundred years ago. Chromosomal translocations, a type of particular structural changes involving heterologous chromosomes, have made a critical impact on diagnosis, prognosis and treatment of cancers. For example, the discovery of translocation between chromosomes 9 and 22 and the subsequent success of targeting the fusion product BCR-ABL transformed the therapy for chronic myelogenous leukemia. In the past few decades, tremendous progress has been achieved towards elucidating the mechanism causing chromosomal translocations. This review focuses on the basic mechanisms underlying the generation of chromosomal translocations. In particular, the contribution of frequency of DNA double strand breaks and spatial proximity of translocating loci is discussed.

关键词： DNA double strand breaks chromosomal translocations genomic instability spatial proximity carcinogenesis

HTML PDF 收藏

自然流产的细胞遗传学研究进展

罗岚蓉,李坚

《中国工程科学》 2015年第17卷第6期页码 65-69

摘要：

自然流产是妊娠并发症，指妊娠在28周之前自然终止，其发病率在15 %～40 %。近年来在辅助生育技术的使用中，同样面临着较高的自然流产率的问题。自然流产的病因十分复杂，除了遗传因素以外，还包括解剖因素、内分泌因素、感染因素、环境因素、免疫因素、血栓前状态以及母体的全身性疾病等等。自然流产的细胞遗传学研究，主要在两个方面，一是胚胎染色体的异常，包括染色体数量异常和结构异常；二是夫妇染色体的异常。在自然流产中胚胎染色体异常的检出率在60 %左右，且随着流产次数的增加，染色体异常的比例下降。其中大部分为胚胎染色体数目异常如三体、三倍体及X单体等，较少为染色体结构异常，包括染色体断裂、倒置、缺失和易位等。在自然流产的夫妇中，尤其是反复自然流产的夫妇，其染色体异常的检出率在8 %左右，且随着流产次数的增加异常的比例升高。成人染色体的异常多为染色体的平衡易位。随着细胞遗传学的检测技术的发展，从传统染色体核型分析和荧光原位杂交技术到染色体微阵列芯片分析、第二代测序技术即高通量测序技术的相继应用，使得自然流产的遗传学方面的研究更加深入。自然流产的细胞遗传学的研究进展，对于自然流产的病因研究以及生育指导有着非常重要的意义。

关键词：自然流产细胞遗传学染色体异常