Polydopamine-coated nucleic acid nanogel for siRNA-mediated low-temperature photothermal therapy

Biomaterials ◽  
2020 ◽  
Vol 245 ◽  
pp. 119976 ◽  
Author(s):  
Fei Ding ◽  
Xihui Gao ◽  
Xiangang Huang ◽  
Huan Ge ◽  
Miao Xie ◽  
...  
2021 ◽  
Author(s):  
Dan Peng ◽  
Genhua Liu ◽  
Ye He ◽  
Pengfei Gao ◽  
Shuangquan Gou ◽  
...  

Recently, photothermal therapy (PTT) has been recognized as a viable alternative strategy against bacterial biofilm infection. However, hyperthermia required for PTT to ablate biofilm usually induced damage of normal tissue/organ...


2017 ◽  
Vol 29 (40) ◽  
pp. 1703588 ◽  
Author(s):  
Yu Yang ◽  
Wenjun Zhu ◽  
Ziliang Dong ◽  
Yu Chao ◽  
Lai Xu ◽  
...  

When subjected to low temperature, certain segments of the chromosomes of Triton vulgaris , T. palmatus and T. cristatus are heterochromatic. At mitosis these segments are undercharged and at meiosis uncharged with nucleic acid. These segments show the same type of allocyclic behaviour as do similar segments in Paris , Trillium and Fritillaria . They form Feulgen-positive chromocentres in all diffuse nuclei except pachytene, which is diffuse in Triton . The availability of nucleic acid at the stage when the chromosomes normally spiralize is now shown to be a condition of that spiralization. The diffuse pachytene without chromocentres is followed by meiosis with unspiralized heterochromatin: the diffuse resting nucleus with chromocentres is followed by mitosis with spiralized heterochromatin. With certain exceptions heterochromatin seems to be confined to those parts of chromosomes where chiasmata and crossing-over rarely occur.


2022 ◽  
Author(s):  
Peiying Huang ◽  
Yin Yin Zhu ◽  
Hao Zhong ◽  
Peiling Chen ◽  
Qunying Shi ◽  
...  

The instinctive protective stress responses of tumor cells hamper the low-temperature photothermal therapy (LTPTT), resulting in tumor recurrence and metastasis. The rapid blood clearance and low-efficiency tumor enrichment of nanomedicines...


2020 ◽  
Vol 185 ◽  
pp. 04003
Author(s):  
Bo pang ◽  
Lihong Jin ◽  
Liying Wang

In this paper, the surface of molybdenum disulfide nanosheets synthesized by hydrothermal method was modified with bovine serum albumin (BSA) and nucleic acid aptamers in order to construct a photothermal system with high target recognition, stable size, good biocompatibility and low toxicity Nano material molybdenum disulfide; Under 808 nm laser irradiation, suitable functionalized molybdenum disulfide nanosheets can produce singlet oxygen at an effective concentration for photodynamic therapy, and at the same time, photothermal therapy can also be used to achieve synergistic therapy and the therapeutic effect is more excellent. This shows that such functionalized molybdenum disulfide nanosheets have excellent therapeutic effect and great potential in tumor treatment.


1956 ◽  
Vol 2 (3) ◽  
pp. 245-260 ◽  
Author(s):  
J. F. Whitfield ◽  
R. G. E. Murray

The aggregation of bacterial chromatin into compact masses under a variety of circumstances (exposure to high salt concentrations, low temperature, ultraviolet irradiation, metabolic inhibitors, and starvation) is a function of the concentration of electrolytes in the environment of the cell. This effect can be prevented or reversed in an environment deficient in salts. The observations indicate that chromatin aggregation is a consequence of interaction of cations (Na+ and K+, in particular) and polymerized desoxyribose nucleic acid, which behaves as an anionic gel. The organisms used (Shigella dysenteriae, Escherichia coli, Bacillus cereus, Caryophanon latum, a wild yeast, and a Geotrichum sp.) were able to maintain their "normal" configuration of chromatin in salt-deficient media and in media with up to 3% salt as long as their metabolism was intact. Disruption of metabolism by exposure to cold or metabolic inhibitors produced aggregation or dispersion of chromatin according to the ionic environment. This range of change in nuclear form can be produced in the living cell without apparent or permanent damage to viability. These studies indicate that bacterial and fungal cells share with cells of higher organisms the ability to regulate the influx and efflux of cations. Chromatin serves as a sensitive indicator of the integrity of these ion regulatory mechanisms. Some implications of these observations are discussed.


Research ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-38
Author(s):  
Xiulin Yi ◽  
Qiu-Yi Duan ◽  
Fu-Gen Wu

Although photothermal therapy (PTT) with the assistance of nanotechnology has been considered as an indispensable strategy in the biomedical field, it still encounters some severe problems that need to be solved. Excessive heat can induce treated cells to develop thermal resistance, and thus, the efficacy of PTT may be dramatically decreased. In the meantime, the uncontrollable diffusion of heat can pose a threat to the surrounding healthy tissues. Recently, low-temperature PTT (also known as mild PTT or mild-temperature PTT) has demonstrated its remarkable capacity of conquering these obstacles and has shown excellent performance in bacterial elimination, wound healing, and cancer treatments. Herein, we summarize the recently proposed strategies for achieving low-temperature PTT based on nanomaterials and introduce the synthesis, characteristics, and applications of these nanoplatforms. Additionally, the combination of PTT and other therapeutic modalities for defeating cancers and the synergistic cancer therapeutic effect of the combined treatments are discussed. Finally, the current limitations and future directions are proposed for inspiring more researchers to make contributions to promoting low-temperature PTT toward more successful preclinical and clinical disease treatments.


Nanoscale ◽  
2020 ◽  
Vol 12 (32) ◽  
pp. 17064-17073
Author(s):  
Jinghua Li ◽  
Daoming Zhu ◽  
Weijie Ma ◽  
Yang Yang ◽  
Ganggang Wang ◽  
...  

Hepatocellular carcinoma is the fourth leading cause of cancer-related deaths globally.


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