共查询到18条相似文献,搜索用时 46 毫秒
1.
2.
固有免疫是与生俱来的非特异防御体系,是机体抵御外来病原体入侵的第一道防线。固有免疫在肿瘤免疫应答中扮演重要角色。随着肿瘤免疫的治疗潜力在临床得到证实,固有免疫细胞在肿瘤免疫应答中的功能及调控机制成为肿瘤免疫研究的热点领域。近年来的研究认识到,细胞的代谢通路在固有免疫应答中发挥重要的调控作用,特别是肿瘤微环境独特的代谢重塑的特点,在赋予免疫细胞更加复杂的代谢特征同时,也提供了新的治疗机会。本文总结了固有免疫细胞的代谢调控领域的最新进展,概述了糖、脂、氨基酸、核酸代谢中的关键代谢物调控固有免疫应答的新机制,特别关注了肿瘤微环境中免疫细胞之间及肿瘤-免疫细胞代谢互动的机制,旨在加深代谢调控固有免疫应答的机制认识,为通过干预代谢的免疫治疗策略提供理论依据。 相似文献
3.
肿瘤细胞具有快速增殖的特点,需要生物大分子提供能量并完成生物合成,以实现不断增殖.逃避免疫监控、肿瘤细胞侵袭、肿瘤细胞的耐药性等生物学特性都与物质、能量代谢相关.新陈代谢是生命活动的重要组成部分,与细胞生化过程密切相关,提供了特定条件下基因与环境之间复杂相互作用的信息.基因型不完全等于表型,存在致癌性的基因突变不一定会... 相似文献
4.
氨基酸代谢是生命活动的基础。在肿瘤组织的恶性转化中,由于肿瘤细胞动力学的改变,导致机体氨基酸代谢缺陷的发生。随着代谢组学的发展,氨基酸及相关衍生药物在肿瘤物诊断及治疗中有着广泛的运用,文章概述了与肿瘤有关的氨基酸代谢缺陷的发生,以及氨基酸衍生药物和氨基酸放射标记物在肿瘤诊断和治疗中的应用,为其在医药领域中进一步地发展提供参考依据。 相似文献
5.
6.
7.
8.
褚欣宇;尹莉芳;秦超 《中南药学》2023,(6):1544-1549
T细胞在抗肿瘤治疗中扮演着重要角色,但当T细胞浸润肿瘤时,它会受到肿瘤微环境(TME)中各种免疫抑制信号和各种代谢产物的影响,导致其免疫功能失效。阐明T细胞在TME作用下的代谢重编程对改善肿瘤免疫治疗、寻找新的治疗策略至关重要。本文从T细胞代谢特征出发,介绍了TME中多种影响T细胞代谢的因素,并总结了各种针对代谢途径的免疫治疗策略。 相似文献
9.
肿瘤细胞的代谢重编程被认为是肿瘤的十大特征之一。肿瘤组织通过代谢重编程以满足肿瘤快速生长对生物能量、生物合成和氧化还原的需求。伴随着肿瘤代谢重编程,细胞内外的一些代谢产物对基因表达、细胞分化和肿瘤微环境均具有深远的影响。其中最显著的变化包括糖酵解的激活、脂质代谢的增加、线粒体生物合成增强以及磷酸戊糖通路的激活。代谢重编程不仅发生在正常细胞向肿瘤细胞转化的过程中,也发生在晚期肿瘤细胞的发育过程中,与抗癌药物的敏感性有很密切的关系。因此,化疗药物联合细胞代谢抑制剂可能是一种有望克服肿瘤耐药的策略。从这个角度讨论肿瘤细胞代谢与肿瘤耐药的关系,并总结出失调的代谢通路可以作为潜在的肿瘤治疗靶点,来抑制对常规治疗耐药的肿瘤。 相似文献
10.
T细胞参与并维持免疫应答、免疫自稳态过程,肿瘤浸润性T细胞的功能和状态与抗肿瘤免疫密切相关。在肿瘤微环境(TME)中,T细胞抗肿瘤作用的发挥受到多重限制:TME的物理屏障阻止T细胞浸润;肿瘤细胞为满足其迅速增殖的需求使用有氧糖酵解的方式消耗大量葡萄糖,限制效应T细胞的功能;抑制性免疫细胞和肿瘤细胞的代谢产物大量堆积,改造TME,TME缺氧、营养匮乏、酸化、代谢物大量堆积,影响T细胞的正常代谢,损害其抗肿瘤能力。通过对肿瘤浸润性T细胞代谢的研究,以及靶向TME代谢的治疗策略进行综述,希望能为肿瘤免疫治疗提供新思路。 相似文献
11.
为提高表达重组人肿瘤坏死因子受体-Fc融合蛋白(rhTNFR-Fc)的CHO工程细胞的培养密度和目的蛋白表达,研究了葡萄糖和谷氨酰胺流加-批式培养工艺的细胞氨基酸代谢特征及游离氨基酸和大豆蛋白水解物的补加策略.通过补加葡萄糖和谷氨酰胺浓缩液分别维持其浓度为10 mmol/L和2 mmol/L左右,在不同阶段定期补加特定的氨基酸浓缩液或大豆蛋白水解物补充氨基酸消耗,检测细胞培养上清中rhTNFR-Fc的表达.谷氨酸、天冬酰胺、天冬氨酸、脯氨酸等4种非必需氨基酸快速消耗,是CHO工程细胞增殖和目的蛋白表达的限制性底物.以游离氨基酸、游离氨基酸合并大豆蛋白水解物补充氨基酸消耗可分别使细胞生长密度提高50%、100%,目的蛋白表达增加60%、125%,培养时程延长44%、66%,同时葡萄糖比消耗率、乳酸比生成率降低,谷氨酰胺的利用效率提高. 相似文献
12.
利用一些放射性标记制剂在肿瘤组织和正常组织中浓集程度的不同,从而早期检出肿瘤并确定病变部位,在核医学上已日益引起重视。例如柠檬酸~(67)镓,~(57)钴博莱霉素等已在临床应用,但效果均尚不够理想。因此寻找具有更好性能的肿瘤定位药物仍是值得注意的问题。肿瘤组织较正常组织代谢旺盛,因此很多作者研究了与组织生长有关的生理活性物质,尤其是氨基酸作为肿瘤定位药物的可能性,陆续已有关于~(75)硒蛋氨酸、5-~(125)碘或6-~(125)碘代色氨酸、对-~(125)碘苯丙氨酸、~(57)钴-赖氨酸、~(11)碳标记的1-氨基环戊-1-羧酸(~(11)C-ACPC)~(99m)锝谷氨酸和天冬氨酸以及二肽化合物H-甘氨酰-L-脯氨酰-对硝基苯胺等在肿瘤组织中浓集较多的报道,但是这些氨基酸的标记或因放射标记物来源不易,或因方法不便难以普及。 相似文献
13.
Our group reported a significant association between hexokinase II overexpression and chemoresistance in ovarian cancer, suggesting that aerobic glycolysis in the so-called Warburg effect might contribute to cancer progression. However, a growing body of evidence indicates contradictory findings with regard to the Warburg effect, such as high mitochondrial activity in highly invasive tumors and low ATP contribution of glycolysis in ovarian cancer. As a solution for the dilemma of the Warburg effect, the “reverse Warburg effect” was proposed in which aerobic glycolysis might occur in the stromal compartment of the tumor rather than in the cancer cells, indicating that the glycolytic tumor stroma feed the cancer cells through a type of symbiotic relationship. The reverse Warburg effect acting on the relationship between cancer cells and cancer-associated fibroblasts has evolved into dynamic interplay between cancer cells and multiple tumor stromal compartments, including cancer-associated fibroblasts, the extracellular matrix, endothelial cells, mesenchymal stem cells, adipocytes, and tumor-associated macrophages. Peritoneal cavities including ascites and the omentum also form a unique environment that is highly receptive for carcinomatosis in the advanced stages of ovarian cancer. The complicated but ingeniously orchestrated stroma-mediated cancer metabolism in ovarian cancer provides great heterogeneity in tumors with chemoresistance, which makes the disease thus far difficult to cure by single stromal-targeting agents. This review will discuss the experimental and clinical evidence of the cross-talk between cancer cells and various components of tumor stroma in terms of heterogeneous chemoresistance with focal points for therapeutic intervention in ovarian cancer. 相似文献
14.
摘 要 目的:采用高效液相色谱与电化学检测器联用(HPLC-ECD)法研究17β 雌二醇经人细胞色素酶CYP1B1亚酶的代谢产物及各产物的生成速率。方法: 色谱柱Mightysil RP 18GP(250 mm×3.0 mm,5 μm)、柱温40℃,电化学检测器E=+900 mV,流动相采用0.5%Na2PO4(pH 3.0)和甲醇混合溶液(45∶55),流速0.5 ml﹒min-1,进样量为5 μl。结果:HPLC ECD法检测17β 雌二醇经CYP1B1代谢产物为4-OH E2,伴有少量2-OH-E2。同浓度雌激素E2经CYP1B1代谢生成4-OH-E2的平均速率是2-OH-E2的约5倍。结论:CYP1B1催化17β-雌二醇基于NADPH代谢的羟基化位点主要是4位。 相似文献
15.
The tumor microenvironment is a critical factor that enhances cancer progression, drug resistance, and failure of therapeutic approaches. Several cellular and non-cellular factors are involved in cancer promotion. Among the several cell populations in the tumor microenvironment, macrophages, as one of the most abundant innate immune cells within the tumor milieu, have attracted extensive attention among several researchers because of their critical role in innate pathophysiology of multiple disorders, as well as ovarian cancer. High plasticity and consequent high ability to adapt to environmental alternations by adjusting their cellular metabolism and immunological phenotype is the notable characteristic of macrophages. Therefore, the critical function of tumor-associated macrophages in ovarian cancer is highlighted in the growing body of recent studies. In this article, we will comprehensively focus on significant impacts of the macrophages on ovarian cancer progression, by discussing the role of macrophages as one of the fundamental immune cells present in tumor milieu, in metabolic reprogramming of transformed cells, and involvement of these cells in the ovarian cancer initiation, progression, invasion, and angiogenesis. Moreover, we will summarise recent studies evaluating the effects of targeting macrophages in ovarian cancer. 相似文献
16.
Two- and five-day old chicks were injected intraventricularly with D-proline and structurally related compounds. D-proline produced convulsions and lethality, but was non-amnestic, whereas the naturally-occurring isomer, L-proline, was non-convulsant and non-toxic but amnestic. D-proline convulsions were accompanied by decreased high frequency in the EEG and increased slow wave activity. High amplitude spiking was not observed. The lethality of D-proline was saline-dependent. Control experiments ruled out possible toxic factors such as hypertonicity, pH pyrogens, injection volume, or needle misplacement. The results demonstrate that saline and distilled water are not equivalent injection vehicles. A sodium-free vehicle may lead to artifacts but is advantageous in experiments in which amino acid transport must be minimized. 相似文献
17.
18.
氨基酮类甲酰(乙酰)氨基酸及二肽衍生物的合成 总被引:1,自引:0,他引:1
在已知具有抗肝炎活性α-乙酰氨基苯乙酮的基础上,将乙酰基更换成氨基酸及二肽酰基,并对氨基苯乙酮的苯环取代基进行改变,合成了38个化合物。所得化合物进行了降转氨酶和抗消化性溃疡的药理筛选。降转氨酶初筛结果表明,苯环上亚甲二氧基的存在对出现降酶活性有很好的影响。 相似文献