Caseinphosphopeptide-induced calcium uptake in human intestinal cell lines HT-29 and Caco2 is correlated to cellular differentiation

• Published in: The Journal of nutritional biochemistry Vol. 21; no. 3; pp. 247 - 254
• Main Authors: Cosentino, Stefania, Gravaghi, Claudia, Donetti, Elena, Donida, Bianca M., Lombardi, Giovanni, Bedoni, Marzia, Fiorilli, Amelia, Tettamanti, Guido, Ferraretto, Anita
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Inc 01-03-2010; New York, NY: Elsevier Science; Elsevier
• Subjects: Alkaline Phosphatase - metabolism; biochemical mechanisms; Biological and medical sciences; Caco-2 Cells; Caco2 cells; calcitriol; Calcitriol - pharmacology; calcium; Calcium - pharmacokinetics; Calcium - pharmacology; Calcium Signaling - drug effects; Calcium uptake; casein; Caseinphosphopeptides; Caseins - pharmacology; cell culture; Cell differentiation; Cell Differentiation - drug effects; Cell Differentiation - physiology; cell proliferation; Cell Proliferation - drug effects; Chelating Agents - pharmacology; dietary minerals; Dietary Supplements; Feeding. Feeding behavior; Fundamental and applied biological sciences. Psychology; HT-29 cells; HT29 Cells; human cell lines; Humans; Intestinal Absorption - drug effects; Intestinal Mucosa - drug effects; Intestinal Mucosa - metabolism; Intestinal Mucosa - ultrastructure; ion transport; Kinetics; Microvilli - enzymology; mineral metabolism; nutrient uptake; Peptide Fragments - pharmacology; Phosphopeptides - pharmacology; phosphoproteins; Sucrase-Isomaltase Complex - metabolism; ultrastructure; Vertebrates: anatomy and physiology, studies on body, several organs or systems; vitamin supplements; Caco2 cells; Cell differentiation; Caseinphosphopeptides; HT-29 cells; Calcium uptake; Human; Calcium; Digestive system; Gut; Uptake; Vertebrata; Cell line; Mammalia; Differentiation
• ISSN: 0955-2863; 1873-4847
• DOI: 10.1016/j.jnutbio.2008.12.016

Caseinphosphopeptides (CPPs) are considered as mineral carriers because of their ability to bind and solubilize calcium ions, with the possible role, yet to be definitely assessed, of improving calcium absorption at the intestinal level. Previous works demonstrated that CPPs improve calcium uptake, with increasing intracellular calcium concentration, by human differentiated tumor HT-29 cells, and that this effect correlates with the supramolecular structure of CPPs in the presence of calcium ions. The aim of the present study was to establish whether the CPP effect on calcium uptake is specific for HT-29 cells and depends on the differentiated state of the cells. To this purpose, HT-29 and Caco2 cells, two models of intestinal cells, were differentiated following appropriate protocols, including treatment with 1,25-(OH)
2 vitamin D
3. The CPP-dependent intracellular calcium rises were monitored at the single-cell level through fura2-fluorescence assays, and cell differentiation was assessed by biochemical and morphological methods. Results clearly showed that the ability to take up extracellular calcium ions under CPP stimulation is exhibited by both HT-29 and Caco2 cells, but only upon cell differentiation. This evidence adds novel support to the notion that CPPs favour calcium absorption, thus possibly acting as cellular bio-modulators and carrying a nutraceutical potential.