Abstract:
BACKGROUND:Granulysin (GNLY) is produced by human lymphocyte subpopulations and exhibits antimicrobial activity against Mycobacterium tuberculosis. We examined the association between GNLY levels in blood and latent tuberculosis (TB) infection. METHODS:Latency of TB infection among Vietnamese healthcare workers was estimated using interferon-gamma release assays (IGRA), and serum GNLY concentrations were measured using enzyme-linked immunosorbent assays. The levels of GNLY expression in whole blood and the presence of GNLY alleles with the exon-4 polymorphism rs11127 were also determined using PCR-based methods. RESULTS:Among 109 study participants, 41 (37.6 %) were IGRA positive and had significantly lower serum GNLY concentrations compared with IGRA-negative participants (adjusted mean, 95 % confidence interval; 2.03, 1.72-2.44 vs. 2.48, 2.10-2.92 ng/ml, P = 0.0127; analysis of covariance). Serum GNLY concentrations and TB antigen-stimulated interferon-gamma values were weakly inversely correlated (r = -0.20, P = 0.0333). Serum GNLY concentrations varied with GNLY genotypes even after adjustment for gender and age (adjusted P = 0.0015) and were moderately correlated with GNLY expression in blood cells (r = 0.40, P < 0.0001). In subsequent analyses, low serum GNLY concentrations were significantly associated with IGRA status (adjusted odds ratio and 95 % confidence interval, 0.55 and 0.31-0.98, respectively), although GNLY genotype and mRNA levels were not. CONCLUSIONS:Decreased GNLY, presumably at the protein level, is linked to the immunological condition of latent TB infection.
journal_name
BMC Infect Disjournal_title
BMC infectious diseasesauthors
Thuong PH,Tam DB,Sakurada S,Hang NT,Hijikata M,Hong LT,Ngoc PT,Anh PT,Cuong VC,Matsushita I,Lien LT,Keicho Ndoi
10.1186/s12879-016-1911-6subject
Has Abstractpub_date
2016-10-18 00:00:00pages
580issue
1issn
1471-2334pii
10.1186/s12879-016-1911-6journal_volume
16pub_type
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pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
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