Hypoxia, a decrease in oxygen tension occurring in pathological tissues, has a profound effect on macrophage functions. Here, we provide the first evidence that hypoxia inhibits CCR5 chemokine receptor expression in mouse macrophages. CCR5 was constitutively expressed in macrophages and upregulated by IFNgamma. Hypoxia downregulated both constitutive and IFNgamma-induced CCR5 mRNA and protein. Reoxygenation of hypoxic cells reverted CCR5 inhibition. CCR5 upregulation by IL-10, LPS, and IL-4 was also antagonized by hypoxia. CCR5 inhibition may be a way to retain/concentrate recruited macrophages at hypoxic sites or a feedback mechanism to control the autocrine activation of macrophages which produce CCR5 ligands.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.cellimm.2004.03.006 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
A Self-Amplifying Photodynamic Biomedicine for Cascade Immune Activation Against Triple-Negative Breast Cancer.
Small
January 2025
Fujian Provincial Key Laboratory of Transplant Biology, Laboratory of Basic Medicine, Fuzong Clinical College of Fujian Medical University (900th Hospital of the Joint Logistics Support Force), Fuzhou, 350025, China.
The efficacy of immunotherapy in triple-negative breast cancer (TNBC) is significantly hindered by its low immunogenicity and immunosuppressive tumor microenvironment. Non-invasive photodynamic therapy (PDT) is increasingly recognized as a potential immunotherapeutic stimulant in the treatment of TNBC. However, photodynamic immunotherapy is constrained by tumor hypoxia and excessive inflammation suppression during the course of treatment.
View Article and Find Full Text PDFMechanism of hyperbaric oxygen therapy downregulating H-type angiogenesis in subchondral bone of knee osteoarthritis through the PHD2/HIF-1α pathway.
J Orthop Surg Res
January 2025
Department of Rehabilitation Medicine, Northern Jiangsu People's Hospital, Yangzhou, Jiangsu, 225001, China.
Objective: To explore the mechanism of hyperbaric oxygen therapy in inhibiting subchondral bone angiogenesis and delaying the progression of osteoarthritis through the PHD2/HIF-1α signaling pathway.
Methods: Mice were randomly divided into three groups (control group, osteoarthritis group, and hyperbaric oxygen treatment group). The effect of hyperbaric oxygen therapy on osteoarthritis was evaluated using Micro-CT, Safranin O-Fast Green staining, and detection of osteoarthritis inflammation markers (MMP-13, ADAMTS-5, Col2a1, and Aggrecan).
Ras Guanine Nucleotide-Releasing Protein-4 Inhibits Erythropoietin Production in Diabetic Mice with Kidney Disease by Degrading HIF2A.
Diabetes Metab J
January 2025
NHC Key Laboratory of Hormones and Development, Chu Hsien-I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin, China.
Background: In acute and chronic renal inflammatory diseases, the activation of inflammatory cells is involved in the defect of erythropoietin (EPO) production. Ras guanine nucleotide-releasing protein-4 (RasGRP4) promotes renal inflammatory injury in type 2 diabetes mellitus (T2DM). Our study aimed to investigate the role and mechanism of RasGRP4 in the production of renal EPO in diabetes.
View Article and Find Full Text PDFMicrobial carbon oxidation in seawater below the hypoxic threshold.
Sci Rep
January 2025
Department of Microbiology, Oregon State University, 220 Nash Hall, Corvallis, OR, USA.
Global oxygen minimum zones (OMZs) often reach hypoxia but seldom reach anoxia. Recently it was reported that Michaelis Menten constants (K) of oxidative enzymes are orders of magnitude higher than respiratory K values, and in the Hypoxic Barrier Hypothesis it was proposed that, in ecosystems experiencing falling oxygen, oxygenase enzyme activities become oxygen-limited long before respiration. We conducted a mesocosm experiment with a phytoplankton bloom as an organic carbon source and controlled dissolved oxygen (DO) concentrations in the dark to determine whether hypoxia slows carbon oxidation and oxygen decline.
View Article and Find Full Text PDFBiomimetic exosome harnessing exosomal lipidomics and functional proteins for PEDF-pDNA delivery in high altitude pulmonary edema intervention.
J Control Release
January 2025
School of Pharmacy, Xuzhou Medical University, Xuzhou, Jiangsu Province, China. Electronic address:
In the realm of gene therapy, given the exceptional performance of native exosomes, researchers have redirected their innovative focus towards exosome-mimetic nanovesicles (EMNs); however, the current design of most EMNs relies heavily on native cells or their components, inevitably introducing inter-batch variability issues and posing significant challenges for quality control. To overcome the excessive reliance on native cellular components, this study adopts a unique approach by precisely mimicking the lipid composition of exosomes and innovatively incorporating histone components to recapitulate the gene transfer characteristics of exosomes. We selected sphingomyelin (SM), phosphatidylcholine (PC), phosphatidylserine (PS), phosphatidylethanolamine (PE), and cholesterol as the lipid components, and employed the double emulsion method to prepare biomimetic exosomes carrying histone A and PEDF-DNA plasmids (His-pDNA@EMNs).
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!