The anti-inflammatory potential of a moderately hydrolysed casein and its 5 kDa fraction in in vitro and ex vivo models of the gastrointestinal tract

Food & Function
Anindya MukhopadhyaTorres Sweeney


Bioactive peptides from milk can impart a wide range of physiological benefits without the allergies and intolerance associated with the consumption of whole milk. The objective of this study was to characterise the anti-inflammatory properties of intact sodium caseinate (NaCAS), a moderately hydrolysed NaCAS enzyme hydrolysate (EH) and its 5 kDa fraction (5kDaR), in both in vitro and ex vivo systems. In vitro, Caco-2 cells were stimulated with tumor necrosis factor (TNF) α and co-treated ± casein hydrolysates or dexamethasone (control). The inflammatory marker interleukin (IL)-8 was measured by ELISA in the supernatant at 24 h. Ex vivo, porcine colonic tissues were stimulated with lipopolysaccharide (LPS) and co-treated with casein hydrolysates for 3 h from which the relative expression of a panel of cytokines was measured in vitro. While the steroid dexamethasone brought about a 41.6% reduction in the IL-8 concentration in the supernatant, the 5kDaR reduced IL-8 by 59% (P < 0.05) when compared to the TNFα stimulated Caco-2 cells. In the ex vivo system, 5kDaR was associated with decreases in IL-1α, IL-1β, IL-8 and TGF-β expression and an increase in IL-17 expression (P < 0.05) relative to the LPS challenged tissues. We conclud...Continue Reading


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