Low serum vitamin D levels in type 2 diabetes patients are associated with decreased mycobacterial activity.
BMC Infect Dis
; 17(1): 610, 2017 09 07.
Article
in En
| MEDLINE
| ID: mdl-28882103
ABSTRACT
BACKGROUND:
Concurrent diabetes mellitus and tuberculosis represent a significant health problem worldwide. Patients with diabetes mellitus have a high risk of tuberculosis, which may be mediated by an abnormal innate immune response due to hyperglycaemia or low vitamin D levels.METHODS:
In the present study, we evaluated inactive vitamin D serum levels and the monocyte response to infection with M. tuberculosis, including phagocytosis of M. tuberculosis, antimycobacterial activity, LL-37, human ß defensin-2 and IL-10 gene expression and nitric oxide production, between type 2 diabetes mellitus patients (n = 51) and healthy volunteers (n = 38).RESULTS:
Twenty-seven type 2 diabetes mellitus patients had inadequate inactive vitamin D levels (<50 nM). The percentages of M. tuberculosis phagocytosis between monocytes were similar across groups according to microscopy. Intracellular mycobacterial growth was similar in infected monocytes from both groups. However, M. tuberculosis growth was significantly higher in monocytes obtained from type 2 diabetes mellitus patients and lower vitamin D levels after 1-h (D0) and 72-h (D3) post-infection (p ≤ 0.05). LL-37, human ß defensin-2 and IL-10 mRNA expression were similar between monocytes across groups; vitamin D serum levels and LL-37, human ß defensin-2 and IL-10 expression were not correlated. Nitric oxide production was significantly higher in healthy volunteers than in type 2 diabetes mellitus patients with low vitamin D serum levels at D3 post-infection (p ≤ 0.05).CONCLUSIONS:
Our results show that monocytes from type 2 diabetes mellitus patients and low vitamin D serum levels show an impaired ability to control the intracellular growth of M. tuberculosis, which is not associated with significant decrease of LL-37 or human ß defensin-2 expression. Vitamin D could be the link between diabetes and tuberculosis susceptibility.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Vitamin D
/
Vitamin D Deficiency
/
Monocytes
/
Diabetes Mellitus, Type 2
/
Mycobacterium tuberculosis
Type of study:
Observational_studies
/
Risk_factors_studies
Limits:
Adult
/
Female
/
Humans
/
Male
/
Middle aged
Language:
En
Journal:
BMC Infect Dis
Journal subject:
DOENCAS TRANSMISSIVEIS
Year:
2017
Document type:
Article
Affiliation country:
Mexico