This study was aimed to investigate the effects of rituximab (RTX), a chimeric human anti-CD20 monoclonal antibody, on lymphoma cell injury induced by X ray irradiation. The human Burkitt EBV-infected and moderate radioresistance lymphoma cells (Namalwa) were used in the this study. Cytotoxicity of rituximab combined with X ray irradiation on Namalwa cells was measured by sulforhodamine B (SRB)-staining; the apoptosis of Namalwa cells was detected by flow cytometry with FITC-Annexin V/PI double staining; the morphologic changes of cells were observed under transmission electron microscope (TEM) and the change of intracellular free calcium level ([Ca(2+)]i) in response to irradiation and rituximab was determined by means of the fluorescent dye fluo-3 and confocal microscopy. The results showed that the growth inhibition in Namalwa cells exposed to irradiation was enhanced by treatment with rituximab. Compared with irradiation alone, rituximab combined with irradiation significantly induced the cell apoptosis and a sustained rise of intracellular free calcium ([Ca(2+)]i) level in Namalwa cells; the serial apoptotic appearances of cells could be observed under TEM. It is concluded that rituximab can enhance the sensitivity of lymphoma cells on X ray irradiation as to induce cell more apoptosis, in this process the intracellular free calcium ([Ca(2+)]i), as an intracellular signaling molecule probably plays an important role.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Chevalierlin: A spirocyclic alkaloid from a hydrothermal vent associated fungus Aspergillus chevalieri TW132-65.
Phytochemistry
January 2025
Ocean College, Zhejiang University, Zhoushan, 316021, China. Electronic address:
A previously undescribed spirodiketopiperazine-indole alkaloid, chevalierlin (1), two pairs of previously undescribed dihydroisocoumarin enantiomers eurotiumides H-I (2-3), as well as six related known compounds (4-9) were isolated from the culture of a hydrothermal vent associated fungus Aspergillus chevalieri TW132-65. Their structures were unambiguously determined by NMR, mass spectrometry, and ECD calculations. Chevalierlin (1) exhibits moderate cytotoxic activities with IC values of 6.
View Article and Find Full Text PDFHumanization of the antigen-recognition domain does not impinge on the antigen-binding, cytokine secretion, and antitumor reactivity of humanized nanobody-based CD19-redirected CAR-T cells.
J Transl Med
July 2024
Department of Medical Biotechnology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran.
Background: The immunogenicity of the antigen-recognition domains of chimeric antigen receptor (CAR)-T cells leads to immune responses that may compromise the antitumor effects of the adoptively transferred T cells. Herein, we attempt to humanize a CD19-specific VHH (named H85) using in silico techniques and investigate the impact of antigen-recognition domain humanization on CAR expression and density, cytokine secretion, and cytolytic reactivity of CAR-T cells based on the humanized VHH.
Methods: H85 was humanized (named HuH85), and then HuH85 was compared with H85 in terms of conformational structure, physicochemical properties, antigenicity and immunogenicity, solubility, flexibility, stability, and CD19-binding capacity using in silico techniques.
TANK Binding Kinase 1 Promotes BACH1 Degradation through Both Phosphorylation-Dependent and -Independent Mechanisms without Relying on Heme and FBXO22.
Int J Mol Sci
April 2024
Department of Biochemistry, Tohoku University Graduate School of Medicine, Sendai 980-8576, Japan.
BTB and CNC homology 1 (BACH1) represses the expression of genes involved in the metabolism of iron, heme and reactive oxygen species. While BACH1 is rapidly degraded when it is bound to heme, it remains unclear how BACH1 degradation is regulated under other conditions. We found that FBXO22, a ubiquitin ligase previously reported to promote BACH1 degradation, polyubiquitinated BACH1 only in the presence of heme in a highly purified reconstitution assay.
View Article and Find Full Text PDFAntimicrobial spiroketal macrolides and dichloro-diketopiperazine from Micromonospora sp. FIMYZ51.
Fitoterapia
June 2024
Polytechnic Institute, Zhejiang University, Hangzhou 310015, People's Republic of China; Ocean College, Zhejiang University, Hangzhou 310058, People's Republic of China. Electronic address:
Four compounds (1-4) featuring with an -rhodinose and spiroketal, possess uncommon continuous hydroxy groups in the macrolide skeleton, and a dichloro-diketopiperazine (5) were isolated from a marine derived Micromonospora sp. FIMYZ51. The determination of the relative and absolute configurations of all isolates was achieved by extensive spectroscopic analyses, single-crystal X-ray diffraction analysis, and ECD calculations.
View Article and Find Full Text PDFDetermination of immunotoxic potencies of a series of perfluoralkylsubstances (PFASs) in human Namalwa B lymphocyte and human Jurkat T lymphocyte cells.
Front Toxicol
March 2024
Wageningen Food Safety Research (WFSR), Wageningen University and Research, Wageningen, Netherlands.
Exposure to PFASs is associated to several adverse health effects, such as immunotoxicity. Immunotoxic effects of PFOA and PFOS, including a reduced antibody response in both experimental animals and humans, have been reported. However, there is limited understanding of the underlying mechanisms involved.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!