Autophagy efficacy and vitamin D status: Population effects.

Abstract:

:Toll-like receptor (TLR) 2/1 signalling is linked to autophagy through transcriptional actions of the 1,25-dihydroxyvitamin D3 (1,25(OH)2D3)-vitamin D receptor (VDR) complex. Population-specific effects have been reported for TLR2/1-VDR signalling. We hypothesized that population effects extend to autophagy and are influenced by vitamin D status. Serum 25(OH)D3 of healthy South Africans (Black individuals n = 10, White individuals n = 10) was quantified by LC-MS/MS. Primary monocytes-macrophages were supplemented in vitro with 1,25(OH)2D3 and stimulated with the lipoprotein Pam3CysSerLys4. TLR2, VDR, hCAP18, Beclin1, LC3-IIB, cytokines and CYP24A1 mRNA were quantified by flow cytometry and RT-qPCR, respectively. Black individuals showed significantly lower overall cumulative LC3-IIB (P < 0.010), but higher Beclin1, VDR, IL6 and TNFA (P < 0.050) than White individuals. 1,25(OH)2D3 enhanced autophagic flux in monocytes-macrophages from Black individuals upon TLR2/1 stimulation and strengthened autophagy in 25(OH)D3 deficient individuals (independent cohort, n = 20). These findings support population-directed vitamin D supplementation.

journal_name

Cell Immunol

journal_title

Cellular immunology

authors

Abhimanyu,Meyer V,Jones BR,Bornman L

doi

10.1016/j.cellimm.2020.104082

subject

Has Abstract

pub_date

2020-06-01 00:00:00

pages

104082

eissn

0008-8749

issn

1090-2163

pii

S0008-8749(19)30487-3

journal_volume

352

pub_type

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