Cyclic dipeptides or diketopiperazines are readily generated during in vitro hydrolysis of proteins and polypeptides. This led us to examine whether cyclo(His-Pro) (CHP), a diketopiperazine containing histidine and proline, could be formed in vivo from dietary proteins. The data presented here show that at least in rat, neither urinary nor plasma concentration of CHP is elevated by consumption of a diet rich in proteins. Several dietary supplements derived from casein and/or soy protein hydrolysates, however, contain high levels of CHP-LI. Oral intake of one such supplement led to a sharp increase in the plasma level of CHP-LI.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/0143-4179(91)90069-u | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Is There a Need to Reassess Protein Intake Recommendations Following Metabolic Bariatric Surgery?
Curr Obes Rep
January 2025
Department of Nutrition Sciences, School of Health Sciences, Ariel University, Ariel, Israel.
Purpose Of Review: Protein intake is recognized as a key nutritional factor crucial for optimizing Metabolic Bariatric Surgery (MBS) outcomes by preventing protein malnutrition, preserving fat-free mass, and inducing satiety. This paper discusses the current evidence regarding protein intake and its impact on clinical outcomes following MBS.
Recent Findings: There are considerable gaps in the understanding of protein requirements following MBS, as existing guidelines are based on limited and inconsistent reports.
Iron improves the antiviral activity of NK cells.
Front Immunol
January 2025
Institute for Virology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
Natural killer (NK) cells are innate immune cells that play a crucial role as a first line of defense against viral infections and tumor development. Iron is an essential nutrient for immune cells, but it can also pose biochemical risks such as the production of reactive oxygen species. The importance of iron for the NK cell function has gained increasing recognition.
View Article and Find Full Text PDFDespite the EU legislation regulating the circulation of dietary and food supplements within the internal market, the system of state control requires improvement. For instance, due to existing regulatory gaps, certain pharmaceutical entities commit violations of regulatory requirements, such as failing to register medicinal products and selling them under the guise of dietary and/or food supplements. Conversely, physicians may recommend ordinary dietary and food supplements to patients as if they were medicinal products.
View Article and Find Full Text PDFBisdemethoxycurcumin and Curcumin Alleviate Inflammatory Bowel Disease by Maintaining Intestinal Epithelial Integrity and Regulating Gut Microbiota in Mice.
J Agric Food Chem
January 2025
Institute of Food Sciences and Technology, National Taiwan University, Taipei 10617, Taiwan.
Curcuminoids, found in turmeric ( L.), include curcumin (CUR), demethoxycurcumin (DMC), and bisdemethoxycurcumin (BDMC). Although CUR and DMC are well-studied, the anti-inflammatory effects of BDMC remain less explored.
View Article and Find Full Text PDFGut microbiota modulation via fecal microbiota transplantation mitigates hyperoxaluria and calcium oxalate crystal depositions induced by high oxalate diet.
Gut Microbes
December 2025
Department of Urology, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.
Hyperoxaluria, including primary and secondary hyperoxaluria, is a disorder characterized by increased urinary oxalate excretion and could lead to recurrent calcium oxalate kidney stones, nephrocalcinosis and eventually end stage renal disease. For secondary hyperoxaluria, high dietary oxalate (HDOx) or its precursors intake is a key reason. Recently, accumulated studies highlight the important role of gut microbiota in the regulation of oxalate homeostasis.
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!