由microRNA和端粒酶触发的细胞内DNA网络组合用于成像引导的STING过激活
Yaru Cheng1, Youming Feng2, Lei Shuai3
1Marshall Laboratory of Biomedical Engineering, Precision Medicine and Health Research Institute, Shenzhen Key Laboratory for Nano-Biosensing Technology, School of Biomedical Engineering, Shenzhen University Medical School, Shenzhen, 518060, China; Beijing Center for Disease Prevention and Control, Beijing, 100013, China.
Biosensors & bioelectronics
|February 22, 2026
概括
这项研究介绍了一种用于癌症免疫治疗的新型纳米平台,该纳米平台使用microRNA和端粒酶精确地激活瘤细胞中的STING. 这种以成像为指导的方法增强了STING激活,从而产生强大的抗瘤免疫力,毒性降低.
科学领域:
- 生物技术是生物技术.
- 免疫学 免疫学 免疫学
- 纳米医学是一种纳米医学.
背景情况:
- 癌症免疫治疗中cGAS-STING激活的临床转化受到非特异性激活和非向性毒性阻碍.
- 针对性激活cGAS-STING通路对于有效和安全的癌症免疫疗法至关重要.
研究的目的:
- 设计一种由微RNA (miRNA) 和端粒酶触发的细胞内DNA网络组装策略,用于成像引导的STING过激活.
- 开发一个纳米平台 (DiG-DNA),在过度表达miRNA-155和端粒酶的瘤细胞中特别激活.
主要方法:
- 利用miRNA响应的头DNA和端粒酶可激活的线性DNA形成一个纳米平台 (DiG-DNA).
- 工程级联激活涉及miRNA-155启动的催化发针组件 (CHA) 和端粒酶驱动的链延长.
- 实时监控DNA网络组装,使用多重光回收 (Cy3 / Cy5) 进行成像指导.
主要成果:
- 在正常细胞中,DiG-DNA保持沉默,但在瘤细胞内组装成密集的3DDNA网络 (N-DNA).
- 在现场形成的N-DNA强烈激活了cGAS,促进了液态液相分离 (LLPS),并强烈激活了STING.
- 在体内表现出强大的瘤抑制,证实了高空间特异性和有效的抗瘤免疫力.
结论:
- 开发了一种细胞内DNA网络组装策略,用于精确和成像导向的癌症免疫疗法.
- 这种方法通过内源生物标记触发器确保了特异性,为基于STING的疗法提供了一个新的范式.
- 该纳米平台可实现受控的STING过激活,从而产生显著的抗瘤效应,并有可能降低毒性.
相关概念视频
01:23RNA Interference
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
03:17Inheritance of Chromatin Structures
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying DNA...
02:41Telomeres and Telomerase
In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.
02:36DNA Damage can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
02:30siRNA - Small Interfering RNAs
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
02:36DNA Damage Can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...