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1.
Sci Total Environ ; 934: 173128, 2024 Jul 15.
Article in English | MEDLINE | ID: mdl-38734106

ABSTRACT

Grazing potential represents the potential carrying capacity of steppe livestock production. Understanding the impact of changes in plant diversity and community structure on ecosystem multifunctionality (EMF) at different grazing potentials is crucial for the sustainable management of steppe ecosystems. We examined the associations between plant diversity, community structure, above-ground ecosystem multifunctionality (AEMF), and below-ground ecosystem multifunctionality (BEMF) at various grazing potentials. Our assessment employed generalized linear mixed-effects models and structural equation models to determine the impact of these factors on ecosystem multifunctionality. Our study results indicated that ecosystem multifunctionality differed depending on the level of grazing potential and decreased as grazing potential declined. The impact of plant diversity and community structure on above- and below-ground ecosystem multifunctionality varied. Plant diversity and community structure correlated more with AEMF than BEMF. Plant diversity had the most significant effect on EMF under high grazing potential, while community structure had the greatest effect on EMF under moderate and low grazing potential. These improve our understanding of the correlation between steppe plant diversity, community structure, and above- and below-ground ecosystem multifunctionality. This understanding is necessary to develop strategies to increase plant diversity or regulate community structure and the sustainability of steppes.


Subject(s)
Biodiversity , Grassland , Herbivory , Animals , Plants , Ecosystem , Livestock/physiology , Environmental Monitoring , Conservation of Natural Resources
2.
Int Immunopharmacol ; 134: 112174, 2024 Jun 15.
Article in English | MEDLINE | ID: mdl-38703571

ABSTRACT

CD19-directed chimeric antigen receptor (CAR) T cell therapy has been shown to achieve a considerably durable response in patients with refractory or relapsed B cell non-Hodgkin lymphomas. Most of these CARs were generated by lentivirus. With the exception of Yescarta and Tecartus, few patients with relapsed-/refractory- lymphoma have been treated clinically with a CARs using retroviral vector (RV). Here, we reported a relapsed/refractory grade 2 follicular lymphoma patient with multiple chemotherapy failures, and was treated with a novel CD19 CAR-T cell manufactured from a RV. After tumor burden was reduced with Obinutuzumab and Duvelisib, the patient was infused novel CD19 CAR-T cells at a dose of 3 × 106 cells/ kg. Then he experienced a rapid response and achieved almost complete remission by day 26. Only grade 2 CRS, bilateral submaxillary lymph node enlargement and cytomegalovirus (CMV) infection occurred without neurotoxicity, and the patient's condition improved after a series of symptomatic treatments. In addition, CAR copy number peaked at 532,350 copies/µg on day 15 and continued to expand for 5 months. This may be the first case report of RV preparation of novel CD19 CAR-T cells for direct treatment of recurrent follicular lymphoma. We will observe its long-term efficacy and conduct trials in more patients in the future.


Subject(s)
Antigens, CD19 , Cytomegalovirus Infections , Immunotherapy, Adoptive , Lymphoma, Follicular , Humans , Lymphoma, Follicular/therapy , Lymphoma, Follicular/immunology , Immunotherapy, Adoptive/methods , Antigens, CD19/immunology , Male , Cytomegalovirus Infections/immunology , Cytomegalovirus Infections/therapy , Receptors, Chimeric Antigen/immunology , Receptors, Chimeric Antigen/therapeutic use , Middle Aged , Treatment Outcome , Neoplasm Recurrence, Local/immunology
3.
Sci Total Environ ; 927: 172206, 2024 Jun 01.
Article in English | MEDLINE | ID: mdl-38580124

ABSTRACT

Brandt's vole (Lasiopodomys brandtii), a typical rodent in the eastern Eurasian Steppe, has unclear impacts on ecosystem stability. In our field study in the Hulun Buir steppe, a multifunctional grazing ecosystem in this region, we used burrow entrance area and burrow density as alternative disturbance indices to derive a Disturbance Index (DI) for quantifying disturbance levels from rodents, and employed generalized linear mixed-effects model and the N-dimensional hypervolume framework to assess the influence of Brandt's vole disturbance on plant and soil functions, and then on the ecosystem functional stability. Our findings unequivocally illustrate that various plant functions including vegetation cover (Cover), aboveground biomass (ABG) and shoot carbon (ShootC) significantly declined with increasing disturbance, while shoot nitrogen (ShootN) and root nitrogen (RootN) show significantly positive responses. Soil functions such as soil nitrogen (SoilN), soil phosphorus (SoilP) and soil organic carbon (SoilC) showed significantly negative responses. Notably, the burrow entrance area exerts a more pronounced impact on both plant and soil functions in comparison to burrow density. Additionally, both disturbance indicators have a more significant influence on plant functions than on soil functions. Overall, the ecosystem functional stability progressively decreases with intensified disturbance, with varying response patterns for plant and soil functions, the former exhibited heightened stability as disturbance intensified, while the latter proved more stable at moderate disturbance levels. Our findings suggest that plant functions were more susceptible to disturbance by Brandt's vole compared to soils. Additionally, an ecosystem destabilization was synchronized with increasing Brandt's vole disturbance, although alterations in the functional stability of plants and soil show a different pattern.


Subject(s)
Arvicolinae , Ecosystem , Grassland , Soil , Animals , Soil/chemistry , Arvicolinae/physiology , Plants , Carbon/metabolism , China , Environmental Monitoring , Biomass , Nitrogen/analysis
4.
Clin Lymphoma Myeloma Leuk ; 24(6): e257-e266, 2024 Jun.
Article in English | MEDLINE | ID: mdl-38461040

ABSTRACT

BACKGROUND: There are limited data comprehensively comparing therapy responses and outcomes among nilotinib, dasatinib, flumatinib and imatinib for newly diagnosed chronic-phase chronic myeloid leukemia in a real-world setting. PATIENTS AND METHODS: Data from patients with chronic-phase CML receiving initial a second-generation tyrosine-kinase inhibitor (2G-TKI, nilotinib, dasatinib or flumatinib) or imatinib therapy from 77 Chinese centers were retrospectively interrogated. Propensity-score matching (PSM) analyses were performed to to compare therapy responses and outcomes among these 4 TKIs. RESULTS: 2,496 patients receiving initial nilotinib (n = 512), dasatinib (n = 134), flumatinib (n = 411) or imatinib (n = 1,439) therapy were retrospectively interrogated in this study. PSM analyses indicated that patients receiving initial nilotinib, dasatinib or flumatinib therapy had comparable cytogenetic and molecular responses (p = .28-.91) and survival outcomes including failure-free survival (FFS, p = .28-.43), progression-free survival (PFS, p = .19-.93) and overall survival (OS) (p values = .76-.78) but had significantly higher cumulative incidences of cytogenetic and molecular responses (all p values < .001) and higher probabilities of FFS (p < .001-.01) than those receiving imatinib therapy, despite comparable PFS (p = .18-.89) and OS (p = .23-.30). CONCLUSION: Nilotinib, dasatinib and flumatinib had comparable efficacy, and significantly higher therapy responses and higher FFS rates than imatinib in newly diagnosed CML patients. However, there were no significant differences in PFS and OS among these 4 TKIs. These real-world data may provide additional evidence for routine clinical assessments to identify more appropriate therapies.


Subject(s)
Dasatinib , Imatinib Mesylate , Humans , Female , Male , Retrospective Studies , Middle Aged , Dasatinib/therapeutic use , Dasatinib/pharmacology , Imatinib Mesylate/therapeutic use , Imatinib Mesylate/pharmacology , Adult , Aged , Pyrimidines/therapeutic use , Leukemia, Myeloid, Chronic-Phase/drug therapy , Protein Kinase Inhibitors/therapeutic use , Protein Kinase Inhibitors/pharmacology , Treatment Outcome , Young Adult , Adolescent , Benzamides/therapeutic use , Aged, 80 and over , Aminopyridines
5.
J Cancer Res Ther ; 19(6): 1495-1500, 2023 Dec 01.
Article in English | MEDLINE | ID: mdl-38156914

ABSTRACT

In December 2022, the Omicron variant of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) became dominant in China due to its high infectivity and lower mortality rate. The risk of critical illness and mortality among patients with hematologic malignancies who contracted SARS-CoV-2 was particularly high. The aim of this study was to draft a consensus to facilitate effective treatments for these patients based on the type and severity of the disease. Following the outbreak of the novel coronavirus in China, a steering committee consisting of experienced hematologists was formed by the Specialized Committee of Oncology and Microecology of the Chinese Anti-Cancer Association. The expert group drafted a consensus on the management and intervention measures for different types of hematologic malignancies based on the clinical characteristics of the Omicron variant of the SARS-CoV-2 infection, along with relevant guidelines and literature. The expert group drafted independent recommendations on several important aspects based on the epidemiology of the Omicron variant in China and the unique vulnerability of patients with hematologic malignancies. These included prophylactic vaccinations for those with hematologic malignancies, the use of plasma from blood donors who recovered from the novel coronavirus infection, the establishment of negative pressure wards, the use of steady-state mobilization of peripheral blood hematopoietic stem cells, the provision of psychological support for patients and medical staff, and a focus on maintaining a healthy intestinal microecology.


Subject(s)
COVID-19 , Hematologic Neoplasms , Humans , SARS-CoV-2 , Consensus , Hematologic Neoplasms/complications , Hematologic Neoplasms/therapy , China/epidemiology
6.
ACS Nano ; 17(17): 16923-16934, 2023 09 12.
Article in English | MEDLINE | ID: mdl-37606317

ABSTRACT

Multidrug resistance (MDR) is a major cause of chemotherapy failure in oncology, and gene therapy is an excellent measure to reverse MDR. However, conventional gene therapy only modulates the expression of MDR-associated proteins but hardly affects their existing function, thus limiting the efficiency of tumor treatment. Herein, we designed a photoactivated DNA nanodrug (MCD@TMPyP4@DOX) to improve tumor chemosensitivity through the downregulation of MDR-related genes and mitochondria-targeted photodynamic therapy (PDT). The self-assembled DNA nanodrug encodes the mucin 1 (MUC1) aptamer and the cytochrome C (CytC) aptamer to facilitate its selective targeting to the mitochondria in tumor cells; the encoded P-gp DNAzyme can specifically cleave the substrate and silence MDR1 mRNA with the help of Mg2+ cofactors. Under near-infrared (NIR) light irradiation, PDT generates reactive oxygen species (ROS) that precisely damage the mitochondria of tumor cells and break single-stranded DNA (ssDNA) to activate MCD@TMPyP4@DOX self-disassembly for release of DOX and DNAzyme. We have demonstrated that this multifunctional DNA nanodrug has high drug delivery capacity and biosafety. It enables downregulation of P-gp expression while reducing the ATP on which P-gp pumps out drugs, improving the latency of gene therapy and synergistically reducing DOX efflux to sensitize tumor chemotherapy. We envision that this gene-modulating DNA nanodrug based on damaging mitochondria is expected to provide an important perspective for sensitizing tumor chemotherapy.


Subject(s)
DNA, Catalytic , Nanoparticles , Drug Resistance, Neoplasm , DNA , DNA, Single-Stranded , Genetic Therapy , Mitochondria , Nanoparticles/therapeutic use
7.
Plants (Basel) ; 12(15)2023 Jul 25.
Article in English | MEDLINE | ID: mdl-37570921

ABSTRACT

Global change and environmental pollution have reawakened ecologists to the great threat of multi-stress interactions to different growth stages of plants. Sophora alopecuroides L., a dune plant, has been widely studied for its medicinal components and strong salinity tolerance. S. alopecuroides seeds, obtained from the desert steppe of Yanchi, Ningxia, China, were used to analyze the effects of sand burial, salinity, drought, and their interactions on seed germination (germination percentage, germination energy, and germination index). The results showed that sand burial and salinity stress had significant effects on the seed germination ability of S. alopecuroides, and drought stress had no significant effect, but the interaction of the three stresses had a significant effect. Under different drought-stress treatments, the interaction of no sand burial and a certain degree of salinity stress significantly improved the germination ability of S. alopecuroides, and the overall intensity of the effects of the three stresses showed that sand burial > salinity > drought. Considering the germination percentage, germination energy, and germination index of S. alopecuroides under various stress interactions, the treatment of no sand burial × 1% soil saline-alkali content × 18-20% soil water content was adopted to maximize the germination ability of S. alopecuroides. In the desert steppe area of Yanchi, Ningxia, sand burial stress was still the most limiting factor for seed germination of S. alopecuroides, and soil saline-alkali content should be increased moderately, and soil moisture should be ensured to obtain the best germination ability.

8.
Nat Commun ; 14(1): 4511, 2023 07 27.
Article in English | MEDLINE | ID: mdl-37500633

ABSTRACT

Postoperative tumor recurrence and metastases often lead to cancer treatment failure. Here, we develop a local embedded photodynamic immunomodulatory DNA hydrogel for early warning and inhibition of postoperative tumor recurrence. The DNA hydrogel contains PDL1 aptamers that capture and enrich in situ relapsed tumor cells, increasing local ATP concentration to provide a timely warning signal. When a positive signal is detected, local laser irradiation is performed to trigger photodynamic therapy to kill captured tumor cells and release tumor-associated antigens (TAA). In addition, reactive oxygen species break DNA strands in the hydrogel to release encoded PDL1 aptamer and CpG, which together with TAA promote sufficient systemic antitumor immunotherapy. In a murine model where tumor cells are injected at the surgical site to mimic tumor recurrence, we find that the hydrogel system enables timely detection of tumor recurrence by enriching relapsed tumor cells to increase local ATP concentrations. As a result, a significant inhibitory effect of approximately 88.1% on recurrent tumors and effectively suppressing metastasis, offering a promising avenue for timely and effective treatment of postoperative tumor recurrence.


Subject(s)
Hydrogels , Neoplasm Recurrence, Local , Humans , Animals , Mice , Neoplasm Recurrence, Local/prevention & control , Antigens, Neoplasm , DNA , Adenosine Triphosphate , Cell Line, Tumor
9.
Adv Healthc Mater ; 12(16): e2203031, 2023 06.
Article in English | MEDLINE | ID: mdl-36708144

ABSTRACT

DNA hydrogels play an increasingly important role in biomedicine and bioanalysis applications. Due to their high programmability, multifunctionality and biocompatibility, they are often used as effective carriers for packing drugs, cells, or other bioactive cargoes in vitro and in vivo. However, the stability of the DNA hydrogels prevents their in-demand rapid release of cargoes to achieve a full therapeutic effect in time. For bioanalysis, the generation of signals sometimes needs the DNA hydrogel to be rapidly degraded when sensing target molecules. To meet these requirements, stimulus-responsive DNA hydrogels are designed. By responding to different stimuli, self-degradable DNA hydrogels can switch from gel to solution for quantitative bioanalysis and precision cargo delivery. This review summarizes the recently developed innovative methods for designing stimuli-responsive self-degradable DNA hydrogels and showed their applications in the bioanalysis and biomedicines fields. Challenges, as well as prospects, are also discussed.


Subject(s)
DNA , Hydrogels , DNA/metabolism
10.
ACS Appl Mater Interfaces ; 14(39): 44183-44198, 2022 Oct 05.
Article in English | MEDLINE | ID: mdl-36165393

ABSTRACT

Immunotherapy is emerging as a paradigm-shifting modality for treatment cancer. However, systemic administration of immunomodulators is usually accompanied by extra-tumor toxicity and adverse immune effects. Precise delivery of immunomodulators with a highly controllable system may provide a solution for this issue. Here, we developed a photocontrolled DNA nanomedicine for localized delivery of DNA immunomodulators to enhance membrane-targeted photodynamic immunotherapy. Specifically, the DNA nanomedicine is composed of long tandemly repeated functional DNA sequences (PDL1 aptamers and CpG) with a photosensitizer (TMPyP4) inserted into the DNA structure, providing high drug-loading capacity. By blocking the surface PDL1 aptamer with a pHLIP-modified cDNA, the DNA nanomedicine does not induce any obvious immune response and can be specifically delivered and anchored to the tumor membrane. Under localized irradiation, photodynamically generated reactive oxygen species (ROS) causes breakage of DNA sequences, which triggers the collapse of the nanostructure and release of internal DNA immunomodulators. Under localized illumination, photodynamically generated ROS can cause DNA sequence breaks, triggering the collapse of nanostructures and the release of internal DNA immunomodulators thus enhancing membrane-targeted photodynamic immunotherapy. We have demonstrated that the developed DNA nanomedicine can drive efficient immune responses in tumor tissue without perceptibly interfering off-tumor immunity, resulting in efficient antitumor treatment while mitigating systemic toxicity.


Subject(s)
Nanoparticles , Neoplasms , Photochemotherapy , Cell Line, Tumor , DNA , DNA, Complementary , Humans , Immunologic Factors , Immunotherapy , Nanoparticles/chemistry , Neoplasms/drug therapy , Oligonucleotides , Photochemotherapy/methods , Photosensitizing Agents/chemistry , Reactive Oxygen Species
11.
Bioconjug Chem ; 33(11): 2035-2040, 2022 11 16.
Article in English | MEDLINE | ID: mdl-35699360

ABSTRACT

In this work, we demonstrate the formation of supramolecular architectures from the assembly of single-tail single stranded DNA (ssDNA)-amphiphiles. Short ssDNA sequences of 10 nucleotides that were either unstructured or formed G-quadruplex secondary structures were conjugated to a single 4-(hexadecyloxy)benzamide tail, either directly or through a polycarbon (C12) spacer. Conjugation of the ssDNA to the tail did not interfere with the G-quadruplex secondary structure of the ssDNA sequence. The ssDNA-amphiphiles self-assembled into ellipsoidal micelles, vesicles, nanotapes, and nanotubes. These nanotubes appeared to be formed by the rolling up of nanotapes. The increase of the hydrophobic block of the ssDNA-amphiphiles through the addition of a C12 spacer led to an increase in wall thickness and nanotube diameter. The presence of π-π interactions, through the benzoic group, was verified via X-ray diffraction (XRD) and played a critical role in the formation of the different nanostructures. In contrast, ssDNA-amphiphiles with a single heptadecanoic acid tail self-assembled only into ellipsoidal micelles.


Subject(s)
G-Quadruplexes , Nanotubes , DNA, Single-Stranded , Micelles , Hydrophobic and Hydrophilic Interactions , Nanotubes/chemistry
12.
J Clin Endocrinol Metab ; 107(7): 1888-1896, 2022 06 16.
Article in English | MEDLINE | ID: mdl-35397165

ABSTRACT

CONTEXT: Cardiovascular benefits of empagliflozin in patients with type 2 diabetes mellitus (T2DM) have been reported; however, the underlying mechanism remains unknown. OBJECTIVE: We hypothesized that the cardiovascular benefits of empagliflozin are associated with altered gut microbiota and plasma metabolites, and that empagliflozin may be used as an initial treatment for patients with T2DM at risk of cardiovascular diseases (CVDs). METHODS: This randomized, open-label, 3-month, 2-arm clinical trial included 76 treatment-naïve patients with T2DM and risk factors for CVD who were treated with either empagliflozin (10 mg/d, n = 40) or metformin (1700 mg/d, n = 36). We investigated changes in clinical parameters related to glucose metabolism and CVD risk factors, gut microbiota using 16S rRNA gene sequencing, and plasma metabolites using LC-MS. RESULTS: We found significant and similar reduction in HbA1c levels and alleviation of glucose metabolism in both groups. However, only empagliflozin improved CVD risk factors. Empagliflozin significantly reshaped the gut microbiota after 1 month of treatment; this alteration was maintained until the end of the trial. Empagliflozin increased the levels of plasma metabolites such as sphingomyelin, but reduced glycochenodeoxycholate, cis-aconitate, and uric acid levels. Concurrently, empagliflozin elevated levels of short-chain fatty acid-producing bacteria such as species from Roseburia, Eubacterium, and Faecalibacterium, and reduced those of several harmful bacteria including Escherichia-Shigella, Bilophila, and Hungatella. CONCLUSION: Empagliflozin may be a superior initial therapy for patients with T2DM at risk of CVDs; its cardiovascular benefits may be associated with shifts in gut microbiota and plasma metabolites.


Subject(s)
Cardiovascular Diseases , Diabetes Mellitus, Type 2 , Gastrointestinal Microbiome , Benzhydryl Compounds , Cardiovascular Diseases/chemically induced , Cardiovascular Diseases/prevention & control , Glucose , Glucosides , Humans , Hypoglycemic Agents/therapeutic use , RNA, Ribosomal, 16S/genetics
14.
JACS Au ; 2(2): 483-491, 2022 Feb 28.
Article in English | MEDLINE | ID: mdl-35252997

ABSTRACT

A DNA-based artificial metalloenzyme (ArM) consisting of a copper(II) complex of 4,4'-dimethyl-2,2'-bipyridine (dmbipy-Cu) bound to double-stranded DNA (dsDNA) as short as 8 base pairs with only 2 contiguous central pairs (G for guanine and C for cytosine) catalyzes the highly enantioselective Diels-Alder reaction, Michael addition, and Friedel-Crafts alkylation in water. Molecular simulations indicate that these minimal sequences provide a single site where dmbipy-Cu is groove-bound and able to function as an enantioselective catalyst. Enantioselective preference inverts when d-DNA is replaced with l-DNA. When the DNA is conjugated to a hydrophobic tail, the obtained ArMs exhibit enantioselective performance in a methanol-water mixture superior to that of non-amphiphilic dsDNA, and dsDNA-amphiphiles with more complex G•C-rich sequences.

15.
Nano Lett ; 22(5): 1937-1945, 2022 03 09.
Article in English | MEDLINE | ID: mdl-35225623

ABSTRACT

Activation of T-cell proliferation specifically in a tumor is crucial for reducing the autoimmune side effects of antitumor immunotherapy. Herein, we developed a pH-driven interlocked DNA nano-spring (iDNS) to stimulate T-cell activation in vivo in response to the low pH value in a tumor microenvironment. The interlocked structure of iDNS provide a more rigid scaffold in comparison to double-stranded DNA for ligand assembly, which can help to control the spatial distribution of ligands with more accuracy. We have demonstrated that the pH-driven reversible reconfiguration of iDNS provides a powerful way to regulate the nanoscale distribution of T-cell receptors (CD3) on the cell surface. The relatively low pH value (pH 6.5) in a solid tumor was able to drive the springlike shrinking of iDNS and induce significant T-cell proliferation, leading to an enhanced antitumor effect, thus providing a tool for specifically inducing an immune response in a tumor for immunotherapy.


Subject(s)
DNA , Neoplasms , Cell Proliferation , Cluster Analysis , DNA/chemistry , Humans , Hydrogen-Ion Concentration , Ligands , Receptors, Antigen, T-Cell , Tumor Microenvironment
16.
Sci Total Environ ; 821: 153378, 2022 May 15.
Article in English | MEDLINE | ID: mdl-35085641

ABSTRACT

As a medicinal plant, Artemisia annua L. is the main source of artemisinin in malaria drugs, but the lack of understanding of its distribution, environmental conditions and protection status limits the mass acquisition of artemisinin. Therefore, we used the ensemble forecast method to model the current and future global distribution areas of A. annua, evaluated the changes in suitable distribution areas on each continent under impacts of human activities and climate change, and its protection status on each continent in the corresponding period. The results showed that the main distribution areas of A. annua were concentrated in mid-latitudes in western and central Europe, southeastern Asia, southeastern North America and southeastern South America. Under the current climate scenario, human modifications have greatly reduced the suitable distribution area of A. annua, which was projected to expand inland with climate change and human socioeconomic impacts of CMIP6 in the future, but the effects of increasing temperature were different in different periods. Among all continents, the suitable distribution area in Europe was the most affected. However, at present and in the future, A. annua needs high priority protection on all continents. Asia and Europe have slightly better protection status scores than other continents, but the protection status scores of all continents are still very low. Our findings can be useful to guide development of protective measures for medicinal plants such as A. annua to further support drug production and disease treatment.


Subject(s)
Anthropogenic Effects , Artemisia annua , Climate , Conservation of Natural Resources , Plants, Medicinal , Asia , Temperature
17.
Ying Yong Sheng Tai Xue Bao ; 32(12): 4539-4548, 2021 Dec.
Article in Chinese | MEDLINE | ID: mdl-34951296

ABSTRACT

The convergent cross mapping (CCM) is a method to analyze causality of nonlinear time series variables. Different from the traditional linear system analysis method, CCM gets historical information based on their state space reconstruction. The presence of causality can be confirmed when the estimated values perform convergent with time series extension. Here, we introduced the develop-ment history of CCM and its advantages over the traditional Granger causality test, and elaborated the principle, algorithm process, and implementation approach. As a system analysis method aiming at the coupling relationship between variables from weak to moderate, CCM can effectively solve the complex causality among nonlinear multivariable in ecosystems. When it is applied to the causality analysis of multi-point time series variables with spatial information, the spatial autocorrelation among points should be fully considered and combined with the method that can remove the spatial correlation between variables and sequences, so as to ensure more accurate causality analysis using CCM and more convincing results.


Subject(s)
Ecology , Ecosystem , Algorithms
18.
Small ; 17(51): e2104722, 2021 12.
Article in English | MEDLINE | ID: mdl-34672076

ABSTRACT

Low-dose photodynamic therapy (PDT) holds great promise for reducing undesired patient photosensitivity in cancer treatment. Yet, its therapeutic effect is significantly affected by intracellular cytoprotective processes, such as autophagy. Here, an efficient autophagy suppressor is developed, which is a multifunctional DNA nanoflower (DNF) consisted of tumor-targeting aptamers and DNAzymes for silencing autophagy-related genes, with surface modification of low-dose photosensitizer (Ce6). It is found that the multifunctional DNF can specifically target tumor cells and generate reactive oxygen species (ROS) under light irradiation to trigger self-disassembly of DNF, enhancing the bioavailability of encoded DNAzymes, leading to amplified autophagy suppression. As a facile spatiotemporally programmable photogene therapy platform, the designed DNF is able to suppress tumor growth in vivo with a very low injection dose of Ce6 (18 µg kg-1 , around 100 times lower than the generally applied dose), representing a promising strategy for cancer therapy with safely low-dose PDT.


Subject(s)
Photochemotherapy , Porphyrins , Autophagy , Cell Line, Tumor , DNA , Humans , Photosensitizing Agents
19.
Onco Targets Ther ; 13: 12255-12268, 2020.
Article in English | MEDLINE | ID: mdl-33273831

ABSTRACT

OBJECTIVE: To study the expression of MRPL13 in breast cancer tissues using TCGA database, analyze the correlation between the expression and clinicopathological characteristics of patients, and explore the role of MRPL13 in the development of breast cancer (BC). METHODS: The BC mRNA data and clinical information were downloaded from TCGA database. The correlation between MRPL13 expression and clinicopathological parameters was analyzed. Cox regression multivariate analysis was used to explore the factors affecting the prognosis of BC patients. The UALCAN database was used to analyze the expression level of MRPL13 in BC and its relationship with clinical pathological factors. The GSEA method was used to predict the possible regulatory pathways of MRPL13. Immune responses of MRPL13 expression were analyzed using TISIDB and CIBERSORT. Additionally, GEPIA, K-M survival analysis and data from the HPA were used to validate the outcomes. RESULTS: The expression of MRPL13 in BC tissues was significantly higher than normal counterparts, patients with low MRPL13 expression had a better survival prognosis, also indicated an independent prognostic factor. GSEA analysis showed that the regulation of cell migration, positive regulation of endothelial cell migration, and Notch signaling pathway were enriched in tissues with low expression of MRPL13. Additionally, depleting MRPL13 expression inhibited invasion in MCF-10A and MCF-7 cells. Furthermore, PCR showed that MRPL13 affected VEGFA and MMP gene expression. CIBERSORT analysis revealed that the amount of NK cells decreased when MRPL13 expression was high. CONCLUSION: The expression of MRPL13 mRNA is upregulated in BC tissues, and the expression level of MRPL13 is significantly related to the clinicopathological factors of patients. High MRPL13 expression is a poor prognostic factor for BC, and it can be used as a molecular marker for prognosis judgment and as a potential therapeutic target.

20.
Nano Lett ; 20(11): 8102-8111, 2020 11 11.
Article in English | MEDLINE | ID: mdl-33064007

ABSTRACT

Multidrug resistance (MDR) of a tumor is the main cause of failure of clinical chemotherapy. Herein, we report a simple, yet versatile, tumor-targeting "calcium ion nanogenerator" (TCaNG) to reverse drug resistance by inducing intracellular Ca2+ bursting. Consequently, the TCaNG could induce Ca2+ bursting in acidic lysosomes of tumor cells and then reverse drug resistance according to the following mechanisms: (i) Ca2+ specifically accumulates in mitochondria, suppressing cellular respiration and relieving tumor hypoxia, thus inhibiting P-glycoprotein biosynthesis by downregulating HIF-1α expression. (ii) Ca2+-bursting-induced respiratory depression blocks intracellular ATP production, which further leads to the P-gp incompetence. As a result, the TCaNG could decrease the IC50 of DOX to MCF-7/ADR cells by approximately 30 times and reduce the proliferation of drug-resistant tumors by approximately 13 times without obvious side effects. This simple, safe, and effective "Ca2+ bursting" strategy holds the potential for clinical application in tumor treatment.


Subject(s)
Calcium , Doxorubicin , ATP Binding Cassette Transporter, Subfamily B, Member 1 , Doxorubicin/pharmacology , Drug Resistance, Multiple , Drug Resistance, Neoplasm , Humans
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