We evaluated the relationship between erythropoietin (EPO) and hemoglobin (Hb) concentrations in 156 normal subjects ranging from 60 to 98 years old. EPO was determined by a radioimmunoassay. The serum EPO concentration in subjects with Hb concentrations greater than 12.0 g/dl (26.9 +/- 15.2 mU/ml), was significantly higher than that in younger controls (15.8 +/- 5.0 mU/ml, p less than 0.001). No sex difference in serum EPO level was detected. In addition, there was an inverse semilogarithmic relationship between EPO and Hb concentrations in subjects with Hb concentrations less than 12.0 g/dl (r = -0.559, p less than 0.001). EPO concentrations in the elderly were lower than those in young subjects with iron deficiency anemia with the same Hb level. Thus, in the elderly, a high EPO concentration may be preventing a decrease in the Hb concentration. However, a decreased EPO response to low Hb concentrations may be a contributing factor in anemia in the elderly.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1159/000213283 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Cost Minimized Immunoaffinity Purification of EPO and Its Analogs in Doping Control-A Step-by-Step Protocol for Human Urine and Blood.
Drug Test Anal
January 2025
European Monitoring Center for Emerging Doping Agents, German Sport University Cologne, Cologne, Germany.
A cost minimized immunoaffinity protocol was developed, which allows the direct purification of ERAs (urinary and recombinant human EPO, Darbepoetin, EPO-Fc, CERA) from human urine. The method applies magnetic beads and needs no covalent immobilization of the capture antibody. It requires only 10 mL of urine, 1 μg of anti-EPO antibody, and 25 μL of bead slurry.
View Article and Find Full Text PDFDietary γ-Aminobutyric Acid Promotes Growth and Immune System Performance and Improves Erythropoiesis and Angiogenesis in Gibel Carp ().
Animals (Basel)
January 2025
Tongwei Agricultural Development Co., Ltd., Key Laboratory of Nutrition and Healthy Culture of Aquatic, Livestock and Poultry, Ministry of Agriculture and Rural Affairs, Healthy Aquaculture Key Laboratory of Sichuan Province, Chengdu 610093, China.
This experiment aimed to investigate the effect of dietary supplementation of γ-aminobutyric acid (GABA) on the growth performance, immune response, and oxygen-transport-related factors of Gibel carp (). An eight-week culturing experiment was designed with five experimental diets, with the actual GABA content being 368 mg/kg (G1, control group), 449 mg/kg (G2), 527 mg/kg (G3), 602 mg/kg (G4), and 675 mg/kg (G5). The results showed that the level of 527 mg/kg (G3) of GABA significantly increased the specific growth rate (SGR), weight gain rate (WGR), and final body weight (FBW) of Gibel carp, while the levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), total cholesterol (TC), and glucose (GLU) were also increased significantly.
View Article and Find Full Text PDFBacopa monnieri Extract Diminish Hypoxia-Induced Anxiety by Regulating HIF-1α Signaling and Enhancing the Antioxidant Defense System in Hippocampus.
Neuromolecular Med
January 2025
Biochemistry and Molecular Biology Laboratory, Department of Zoology, Institute of Science, Banaras Hindu University, Varanasi, 221 005, India.
Hypoxia is a significant stressor, and stabilized hypoxia-inducible factor-1α (HIF-1α) regulates the expression of numerous genes, leading to various biochemical, molecular, physiological and genomic changes. The body's oxygen-sensing system activates gene expression to protect brain tissues from hypoxia. Gamma-aminobutyric acid, an inhibitory neurotransmitter, regulates brain excitability during hypoxia through the activation of HIF-1 α.
View Article and Find Full Text PDFBlood management protocol for baseline anemic patients undergoing hip arthroplasty.
Arch Orthop Trauma Surg
January 2025
AMR Advanced Medical Research, Männedorf, Switzerland.
Introduction: Patients undergoing total hip arthroplasty (THA) with preoperative anemia are at higher risk for transfusion. Blood-conserving interventions can reduce perioperative transfusions. This retrospective study evaluates the efficacy and safety of a patient blood management (PBM) protocol in elective primary THA patients with preoperative anemia.
View Article and Find Full Text PDFIntegrated SegFlow, µSIA, and UPLC for Online Sialic Acid Quantitation of Glycoproteins Directly from Bioreactors.
Eng Life Sci
January 2025
Analytical Development & Analytical Attribute Science in Biologics Bristol Myers Squibb Devens Massachusetts USA.
This study emphasizes the critical importance of closely monitoring and controlling the sialic acid content in therapeutic glycoproteins, including EPO, interferon-γ, Orencia, Enbrel, and others, as the level of sialylation directly impacts their pharmacokinetics (PK), immunogenicity, potency, and overall clinical performance due to its influence on protein clearance via hepatic asialoglycoprotein receptors (ASGPR). The ASGPR recognizes and binds to glycoproteins exposed to terminal galactose or N-acetylgalactosamine residues, leading to receptor-mediated endocytosis. Recent studies have demonstrated that sialylation of O-linked glycan plays a role in protecting against macrophage galactose lectin (MGL)-mediated clearance.
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!