随着对酸敏感离子通道(Acid-sensing ion channels,ASICs)研究的不断深入,其在临床相关疾病中的功能研究也逐渐受到重视。ASICs的功能异常与一系列临床疾病和症状密切相关,包括神经系统肿瘤、缺血性损伤、癫痫、疼痛以及亨廷顿氏症等。...随着对酸敏感离子通道(Acid-sensing ion channels,ASICs)研究的不断深入,其在临床相关疾病中的功能研究也逐渐受到重视。ASICs的功能异常与一系列临床疾病和症状密切相关,包括神经系统肿瘤、缺血性损伤、癫痫、疼痛以及亨廷顿氏症等。在细胞内正常的分布与定位是AISCs发挥其生理功能的前提,而多项研究已经确认,在正常生理的状态下,ASICs在细胞内具有相对固定的分布方式。换言之,正常的细胞内存在着可以对ASICs的分布进行调节的调控系统。目前也发现了包括PICK1、HSP70等与之相关的一系列物质分子。鉴于ASICs在人体诸多生理、病理过程中发挥重要作用,对ASICs功能异常的相关研究便成为了目前基础研究工作的重点之一。本文拟就ASICs在细胞内的分布定位及其转运调节机制作一综述,进而初步探讨其在临床应用中的前景。展开更多
Apoptosis manifests in two major execution programs downstream of the death signal: the caspase pathway and organelle dysfunction. An important antiapoptosis factor, Bcl-2 protein, contributes in caspase pathway of ap...Apoptosis manifests in two major execution programs downstream of the death signal: the caspase pathway and organelle dysfunction. An important antiapoptosis factor, Bcl-2 protein, contributes in caspase pathway of apoptosis. Calcium, an important intracellular signal element in cells, is also observed to have changes during apoptosis, which maybe affected by Bcl-2 protein. We have previously reported that in Harringtonine (HT) induced apoptosis of HL-60 cells, there’s a change of intracellular calcium distribution, moving from cytoplast especially Golgi’s apparatus to nucleus and accumulating there with the highest concentration. We report here that caspase-3 becomes activated in HT-induced apoptosis of HL-60 cells, which can be inhibited by overexpression of Bcl-2 protein. No sign of apoptosis or intracellular calcium movement from Golgi’s apparatus to nucleus in HL-60 cells overexpressing Bcl-2 or treated with Ac-DEVD-CHO, a specific inhibitor of caspase-3. The results indicate that activated caspase-3 can promote the movement of intracellular calcium from Golgi’s apparatus to nucleus, and the process is inhibited by Ac-DEVD-CHO (inhibitor of caspase-3), and that Bcl-2 can inhibit the movement and accumulation of intracellular calcium in nucleus through its inhibition on caspase3. Calcium relocalization in apoptosis seems to be irreversible, which is different from the intracellular calcium changes caused by growth factor.展开更多
The toxicity and bioaccumulation of selenite in four microalgae, Spirulina platensis, Dunaliella salina, Dunaliella bardawill and Phaeodactylum tricornutum cultured in the presence of selenite were investigated. Lower...The toxicity and bioaccumulation of selenite in four microalgae, Spirulina platensis, Dunaliella salina, Dunaliella bardawill and Phaeodactylum tricornutum cultured in the presence of selenite were investigated. Lower concentrations of selenite were generally nontoxic and frequently stimulated algal growth, while higher concentrations of selenite inhibited algal growth. Selenite was more toxic to D. salina and D. bardawill than to S. platensis and P. tricornutum . All algae cultured in selenite were able to incorporate Se to different degrees, which depended on algal species. The distributions of selenite among intracellular macromolecular compounds were different among algal species: most of the selenite was associated with proteins in S. platensis, D. salina and D. bardawill , while most of the selenite was associated with lipids in P. tricornutum , which reflected the physiological differences among the algae. These observations suggest that algae are able to accumulate selenite and bind it with intracellular macromolecular compounds when exposed to high concentration of selenite. This may represent a form of storage or detoxification of selenite by the algae.展开更多
文摘随着对酸敏感离子通道(Acid-sensing ion channels,ASICs)研究的不断深入,其在临床相关疾病中的功能研究也逐渐受到重视。ASICs的功能异常与一系列临床疾病和症状密切相关,包括神经系统肿瘤、缺血性损伤、癫痫、疼痛以及亨廷顿氏症等。在细胞内正常的分布与定位是AISCs发挥其生理功能的前提,而多项研究已经确认,在正常生理的状态下,ASICs在细胞内具有相对固定的分布方式。换言之,正常的细胞内存在着可以对ASICs的分布进行调节的调控系统。目前也发现了包括PICK1、HSP70等与之相关的一系列物质分子。鉴于ASICs在人体诸多生理、病理过程中发挥重要作用,对ASICs功能异常的相关研究便成为了目前基础研究工作的重点之一。本文拟就ASICs在细胞内的分布定位及其转运调节机制作一综述,进而初步探讨其在临床应用中的前景。
基金the National Natural Science Foundation of China(Grant No. 39730160).
文摘Apoptosis manifests in two major execution programs downstream of the death signal: the caspase pathway and organelle dysfunction. An important antiapoptosis factor, Bcl-2 protein, contributes in caspase pathway of apoptosis. Calcium, an important intracellular signal element in cells, is also observed to have changes during apoptosis, which maybe affected by Bcl-2 protein. We have previously reported that in Harringtonine (HT) induced apoptosis of HL-60 cells, there’s a change of intracellular calcium distribution, moving from cytoplast especially Golgi’s apparatus to nucleus and accumulating there with the highest concentration. We report here that caspase-3 becomes activated in HT-induced apoptosis of HL-60 cells, which can be inhibited by overexpression of Bcl-2 protein. No sign of apoptosis or intracellular calcium movement from Golgi’s apparatus to nucleus in HL-60 cells overexpressing Bcl-2 or treated with Ac-DEVD-CHO, a specific inhibitor of caspase-3. The results indicate that activated caspase-3 can promote the movement of intracellular calcium from Golgi’s apparatus to nucleus, and the process is inhibited by Ac-DEVD-CHO (inhibitor of caspase-3), and that Bcl-2 can inhibit the movement and accumulation of intracellular calcium in nucleus through its inhibition on caspase3. Calcium relocalization in apoptosis seems to be irreversible, which is different from the intracellular calcium changes caused by growth factor.
文摘The toxicity and bioaccumulation of selenite in four microalgae, Spirulina platensis, Dunaliella salina, Dunaliella bardawill and Phaeodactylum tricornutum cultured in the presence of selenite were investigated. Lower concentrations of selenite were generally nontoxic and frequently stimulated algal growth, while higher concentrations of selenite inhibited algal growth. Selenite was more toxic to D. salina and D. bardawill than to S. platensis and P. tricornutum . All algae cultured in selenite were able to incorporate Se to different degrees, which depended on algal species. The distributions of selenite among intracellular macromolecular compounds were different among algal species: most of the selenite was associated with proteins in S. platensis, D. salina and D. bardawill , while most of the selenite was associated with lipids in P. tricornutum , which reflected the physiological differences among the algae. These observations suggest that algae are able to accumulate selenite and bind it with intracellular macromolecular compounds when exposed to high concentration of selenite. This may represent a form of storage or detoxification of selenite by the algae.
