l-Carnitine is derived both from dietary sources and biosynthesis. Dietary carnitine is absorbed in the small intestine and then distributed to other organs. Previous studies using Caco-2 cells demonstrated that the transport of l-carnitine in the intestine involves a carrier-mediated system. The purpose of this study was to determine whether the uptake of l-carnitine in Caco-2 cells is mediated by the recently identified organic cation/carnitine transporter (OCTN2). Kinetics of l-[(3)H]carnitine uptake were investigated with or without specific inhibitors. l-Carnitine uptake in mature cells was sodium dependent and linear with time. K(m) and V(max) values for saturable uptake were 14.07 +/- 1.70 micro M and 26.3 +/- 0.80 pmol. mg protein(-1). 6 min(-1), respectively. l-carnitine uptake was inhibited (P < 0.05-0.01) by valproate and other organic cations. Anti-OCTN2 antibodies recognized a protein in the brush-border membrane (BBM) of Caco-2 cells with an apparent molecular mass of 60 kDa. The OCTN2 expression was confirmed by double immunostaining. Our results demonstrate that l-carnitine uptake in differentiated Caco-2 cells is primarily mediated by OCTN2, located on the BBM.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1152/ajpgi.00220.2002 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Gastrointestinal absorption and its regulation of hawthorn leaves flavonoids.
Sci Rep
January 2025
School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai, 201203, P.R. China.
Hawthorn leave flavonoids (HLF) are widely used as an herb or dietary supplements for cardio-cerebrovascular diseases. However, its gastrointestinal absorption behavior and mechanism have not been disclosed. In this study, gastrointestinal absorption and its regulation of 4''-O-glucosylvitexin (GLV), 2''-O-rhamnosylvitexin (RHV), vitexin (VIT), rutin (RUT) and hyperoside (HP) in HLF were investigated using in vitro, in situ and in vivo models.
View Article and Find Full Text PDFThymoquinone loaded lipid nanocapsule dispersion: two methods of preparation, characterization and evaluations for oral administration.
Pharm Dev Technol
January 2025
Univ Angers, INSERM, CNRS, MINT, SFR ICAT, France.
This work explores two methods to encapsulate Thymoquinone (TQ) into lipid nanocapsules (LNCs) for oral administration. TQ was added during the phase inversion temperature method (TQ-LNCs-1) or to unload LNCs dispersion (TQ-LNCs-2). LNCs were evaluated for mean diameter, polydispersity index (PDI), ζ-potential, drug loading (DL), drop tensiometer, storage stability, stability in simulated gastrointestinal fluids (SGIF), and intestinal permeability across Caco-2 cells.
View Article and Find Full Text PDFThe anticancer activity of fucoidan coated selenium nanoparticles and curcumin nanoparticles against colorectal cancer lines.
Sci Rep
January 2025
Department of Fish Processing and Biotechnology, Faculty of Aquatic and Fisheries Sciences, Kafrelsheikh University, Kafrelsheikh, 33516, Egypt.
Cancers still globally endanger millions of people yearly; the incidences/mortalities of colorectal cancers are particularly increasing. The natural nanoparticles (NPs) and marine biopolymers were anticipated to provide effectual safe significances for managing cancers. The transformation of curcumin to nano-curcumin (NCur) was conducted with gum Arabic.
View Article and Find Full Text PDFFunctional Characterization of the Global Regulator Hfq in Aeromonas veronii Reveals an Essential Role in Pathogenesis and Secretion of Effectors.
Microb Pathog
December 2024
Pathogenesis and Control of Pathogenic Microorganisms Research Team, School of Life and Health Sciences, Hainan Province Key Laboratory of One Health, Collaborative Innovation Center of One Health, Hainan University, Haikou, Hainan 570228, China. Electronic address:
The RNA chaperone Hfq acts as an important virulence regulator playing a diverse role in the virulence and pathogenicity of several infectious bacteria. As a threating pathogen inducing diseases in humans, animals and aquatic organisms, Aeromonas veronii attracts attentions with respect to its elusive pathogenic mechanism and virulence factors. This study aims to elucidate the functions of hfq gene in A.
View Article and Find Full Text PDFEffect of Cu- and Fe- Isolated from Environmental Particulate Matter on Mitochondrial Dynamics in Human Colon CaCo-2 Cells.
Biol Trace Elem Res
December 2024
Department of Animal Science, North Carolina State University, Plants for Human Health Institute, NC Research Campus, Kannapolis, NC, USA.
Atmospheric particulate matter (PM) is one of the most dangerous air pollutants of anthropogenic origin; it consists of a heterogeneous mixture of inorganic and organic components, including transition metals and polycyclic aromatic hydrocarbons. Although previous studies have focused on the effects of exposure to highly concentrated PM on the respiratory and cardiovascular systems, emerging evidence supports a significant impact of air pollution on the gastrointestinal (GI) tract by linking exposure to external stressors with conditions such as appendicitis, colorectal cancer, and inflammatory bowel disease. In general, it has been hypothesized that the main mechanism involved in PM toxicity consists of an inflammatory response and this has also been suggested for the GI tract.
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!