Clearance of apoptotic cells increases macrophage secretion of antiinflammatory mediators and might modulate viral replication in human immunodeficiency virus (HIV) type 1-infected macrophages. To study this, primary macrophages were infected with HIV-1 and exposed to apoptotic cells. It was found that phagocytosis of apoptotic cells potently enhanced HIV-1 growth. The peptide Arg-Gly-Asp-Ser, which binds to integrin receptors, inhibited the uptake of apoptotic cells and the subsequent enhancement of HIV-1 replication. Viral replication was preceded by increased secretion of transforming growth factor (TGF)-beta1 and partially reverted by anti-TGF-beta1 antibodies. Moreover, anti-TGF-beta1 antibodies inhibited HIV-1 replication in macrophages not exposed to apoptotic cells. A positive correlation was observed between TGF-beta1 production and HIV-1 growth, and the addition of TGF-beta1 amplified HIV-1 replication in macrophages from low TGF-beta1 producers. The findings suggest that TGF-beta1 favors HIV-1 replication in macrophages and that the clearance of apoptotic cells by HIV-1-infected macrophages contributes to persistent viremia in patients infected with HIV-1.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1086/340412 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Exploration of the Combined Mechanism of Direct and Indirect Effects of Paeoniflorin in the Treatment of Cholestasis.
Inflammation
January 2025
Department of Pharmacy, Chinese PLA General Hospital, Beijing, China.
Cholestasis is a multifactorial hepatobiliary disorder, characterized by obstruction of bile flow and accumulation of bile, which in turn causes damage to liver cells and other tissues. In severe cases, it can result in the development of life-threatening conditions, including cirrhosis and liver cancer. Paeoniflorin (PF) has been demonstrated to possess favourable therapeutic potential for the treatment of cholestasis.
View Article and Find Full Text PDFExploring ferroptosis and miRNAs: implications for cancer modulation and therapy.
Mol Cell Biochem
January 2025
Department of Molecular Genetics, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box: 14115-154, Tehran, Iran.
Ferroptosis is a novel, iron-dependent form of non-apoptotic cell death characterized by the accumulation of lipid reactive oxygen species (ROS) and mitochondrial shrinkage. It is closely associated with the onset and progression of various diseases, especially cancer, at all stages, making it a key focus of research for developing therapeutic strategies. Numerous studies have explored the role of microRNAs (miRNAs) in regulating ferroptosis by modulating the expression of critical genes involved in iron metabolism and lipid peroxidation.
View Article and Find Full Text PDFIntegrated Genomics Reveal Potential Resistance Mechanisms of PANoptosis-Associated Genes in Acute Myeloid Leukemia.
Mol Carcinog
January 2025
Institute of Precision Medicine, The First Affiliated Hospital; Department of Pediatrics, The Seventh Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.
Acute myeloid leukemia (AML) is marked by the proliferation of abnormal myeloid progenitor cells in the bone marrow and blood, leading to low cure rates despite new drug approvals from 2017 to 2018. Current therapies often fail due to the emergence of drug resistance mechanisms, such as those involving anti-apoptotic pathways and immune evasion, highlighting an urgent need for novel approaches to overcome these limitations. Programmed cell death (PCD) is crucial for tissue homeostasis, with PANoptosis-a form of PCD integrating pyroptosis, apoptosis, and necroptosis-recently identified.
View Article and Find Full Text PDFEvaluation of Neutrophil Elastase Inhibitors as Potential Therapies for Associated Neutropenia.
J Cell Immunol
January 2024
Department of Medicine, University of Washington, Seattle, Washington, U.S.A.
Neutrophil elastase () mutations are the most common cause of cyclic (CyN) and congenital neutropenia (SCN), two autosomal dominant disorders causing recurrent infections due to impaired neutrophil production. Granulocyte colony-stimulating factor (G-CSF) corrects neutropenia but has adverse effects, including bone pain and in some cases, an increased risk of myelodysplasia (MDS) and acute myeloid leukemia (AML). Hematopoietic stem cell transplantation is an alternative but is limited by its complications and donor availability.
View Article and Find Full Text PDFFXYD6 is transcriptionally activated by KLF10 to suppress the aggressiveness of gastric cancer cells.
Cytotechnology
April 2025
The First College of Clinical Medical Science, Yichang Central People's Hospital, China Three Gorges University, Yichang, 443000 China.
Despite improvements in therapeutic approaches, the mortality rate of gastric cancer (GC) remains unacceptably high. Evidence suggests that FXYD domain containing ion transport regulator 6 (FXYD6) is downregulated in GC. However, its exact function and the molecular mechanism in GC are still unclear.
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!