Background: Dipeptidyl peptidase-IV (DPP-IV) enzymatic activity controls biological halftime of multiple local mediators. Its deregulation is associated with pathogenesis of several autoimmune diseases, including rheumatoid arthritis (RA). Although DPP-IV is the canonical representative of the group, a number of other proteins have been shown to have similar enzymatic activity. This study was aimed to identify the molecular source of DPP-IV activity in synovial fluid (SF) and fluid mononuclear cells (FMNC) in patients with RA and osteoarthritis (OA). In addition, the association of DPP-IV and the concentration of stromal cell-derived factor-1alpha (SDF), DPP-IV substrate, were evaluated.
Methods: DPP-IV activity was measured by the kinetic fluorimetric method. The expression of studied molecules in FMNC and their concentrations in SF were assayed using flow cytometry and ELISA respectively.
Results: DPP-IV activity in SF, dominantly derived from the canonical DPP-IV, does not significantly differ between RA and OA. However, a significantly lower DPP-IV activity and expression in FMNC was found in RA as opposed to OA patients. Negative correlation between SDF concentration in SF and the relative amount of CD3+CD26+ cells was observed.
Conclusions: We report decreased presence of DPP-IV/CD26 in CD3+ FMNC in RA, which also may participate on impaired balance of SDF concentration in SF.
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http://dx.doi.org/10.1016/j.cca.2010.03.034 | DOI Listing |
Food Chem
December 2024
College of Food Science, Southwest University, No.2 Tiansheng Road, Beibei District, Chongqing 400715, China; Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, No.2 Tiansheng Road, Beibei District, Chongqing 400715, China; Chongqing Engineering Research Center of Regional Food, No.2 Tiansheng Road, Beibei District, Chongqing 400715, China. Electronic address:
The purpose of this study was to understand the effects of cooking treatment on the protein hydrolysis of beef tripe and the release of potentially bioactive peptides using an in vitro gastrointestinal model. The results showed that digestion promoted the hydrolysis of proteins and release of free amino acids in beef tripe, but cooking treatment significantly reduced them. The sample of the cooked beef tripe after gastrointestinal digestion had the highest antioxidant activity.
View Article and Find Full Text PDF3 Biotech
January 2025
Faculty of Industrial Sciences and Technology, Universiti Malaysia Pahang Al-Sultan Abdullah, Lebuhraya Persiaran Tun Khalil Yaakob, Gambang, 26300 Kuantan, Pahang Malaysia.
Diabetes mellitus (DM) is a metabolic disease marked by an excessive rise in blood sugar (glucose) levels caused by a partial or total absence of insulin production, combined with alterations in the metabolism of proteins, lipids, and carbohydrates. The International Diabetes Federation estimates that 425 million individuals globally had diabetes in 2017 which will be 629 million by 2045. Several medications are used to treat DM, but they have limitations and side effects including weight gain, nausea, vomiting, and damage to blood vessels and kidneys.
View Article and Find Full Text PDFMar Drugs
December 2024
Department of Biological Sciences Ålesund, Norwegian University of Science and Technology, 6009 Ålesund, Norway.
The use of fish rest raw material for the production of fish protein hydrolysates (FPH) through enzymatic hydrolysis has received significant interest in recent decades. Peptides derived from fish proteins are known for their enhanced bioactivity which is mainly influenced by their molecular weight. Studies have shown that novel technologies, such as high-pressure processing (HPP), can effectively modify protein structures leading to increased biological activity.
View Article and Find Full Text PDFJ Sci Food Agric
December 2024
College of Ocean Food and Biological Engineering, Jimei University, Xiamen, China.
Background: It is important to study the physicochemical properties of tilapia (Oreochromis mossambicus) skin gelatin and the changes in dipeptidyl peptidase IV (DPP-IV) inhibition activity during gastrointestinal digestion in order to understand and exploit the potential of tilapia as a source of DPP-IV inhibitory peptides.
Results: The DPP-IV inhibition of fish-skin gelatin increased from 9.92 ± 0.
Chem Biodivers
December 2024
University of Ruhuna Faculty of Medicine, Biochemistry, Faculty of Medicine, University of Ruhuna, 80000, Galle, SRI LANKA.
The present study aimed to synthesize, characterize, and determine the antidiabetic activity of Gmelina arborea and Spondias pinnata aqueous extract encapsulated nanoliposomes (GAE-NL and SAE-NL). GAE-NL and SAE-NL were synthesized using modified emulsification and ultrasonication. The average size, polydispersity index, and zeta potential of GAE-NL and SAE-NL were 307±2 nm, 0.
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