Clinical Trial ARTICLE
Bovine lactoferrin enhances TLR7-mediated responses in plasmacytoid Dendritic Cells in elderly women. Results from a nutritional intervention study with bovine lactoferrin, GOS and vitamin D
- 1Wageningen University & Research, Netherlands
- 2FrieslandCampina (Netherlands), Netherlands
- 3NIZO Food Research BV, Netherlands
During ageing the immune system is dysregulated. Especially plasmacytoid dendritic cells (pDCs) and myeloid DCs (mDCs) have reduced Toll like receptor (TLR)-mediated responses resulting in increased susceptibility to infections. Consumption of bovine lactoferrin (bLF) has been shown to reduce infections with viruses. Galactooligosacharides (GOS) and vitamin D are associated with reduced pro-inflammatory cytokine levels in serum, and increased TLR7/8 responses, respectively. A double-blind placebo-controlled nutritional intervention study in elderly women was performed, to investigate the potential of bLF, GOS and vitamin D to restore TLR responsiveness of pDCs and mDCs and to reduce inflammatory markers in serum. The nutritional intervention group (n=15) received 3 weeks of bLF, followed by 3 weeks of bLF + GOS, and subsequently 3 weeks of bLF + GOS + vitamin D. The placebo group (n=15) received maltodextrin for 9 weeks. Every 3 weeks, blood was collected and TLR responses of pDCs and mDCs and inflammation-related markers in serum were measured. After 3 weeks of bLF supplementation, increased TLR7/8 and TLR1/2 responses were observed in pDCs of the nutritional intervention group compared to the placebo group. When the effects of the entire nutritional intervention were investigated, increased TLR1/2 mediated responses in mDCs were observed, and in serum sVCAM tended to decrease. Finally, based on the RAND-36 questionnaire physical function tended to improve in the intervention group. Since, especially TLR7-mediated responses in pDCs were enhanced after bLF supplementation compared to placebo, this suggests that bLF may contribute to antiviral responses mediated by pDC in elderly women.
Clinical trial registry number: NCT03026244, clinicaltrials.gov
Keywords: Ageing, TLR - toll-like receptor, Plasmacytoid dendritic cell (PDC), Myeloid dendritic cells (mDCs), Bovine lactoferin, Galacto oligosaccharides, Vitamin D, Inflammation
Received: 30 Aug 2018;
Accepted: 30 Oct 2018.
Edited by:Haruki Kitazawa, Tohoku University, Japan
Reviewed by:Md. Aminul Islam, Universität Bonn, Germany
Claudio Nicoletti, Università degli Studi di Firenze, Italy
Copyright: © 2018 Van Splunter, Perdijk, Fick-Brinkhof, Feitsma, Floris-Vollenbroek, Meijer, Brugman, Savelkoul, van Hoffen and Van Neerven. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Prof. R.J. Joost Van Neerven, Wageningen University & Research, Wageningen, Netherlands, firstname.lastname@example.org