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Is there any correlation between HLA-DR expression in laryngeal mucosa and interleukin gene variation in sudden infant death syndrome?

Authors


Correspondence

Linda Ferrante, Norwegian Institute of Public Health, Department of Forensic Pathology and clinical Forensic Medicine, PO Box 4404, Nydalen N-0403, Oslo, Norway.

Tel: +47 210 77 607 |

Fax: +47 210 77 590 |

Email: linda.ferrante@fhi.uio.no

Abstract

Aim

The mucosal immune system and cytokines are activated in a large proportion of cases of sudden infant death syndrome (SIDS). Our aim was to search for a possible association between cytokine polymorphisms and immune stimulation of the laryngeal mucosal in SIDS.

Methods

HLA-DR expression in laryngeal mucosal glands and surface epithelium in 97 SIDS victims was evaluated applying a semi-quantitative scoring system. The findings were related to cytokine gene polymorphisms as well as to the level of various cytokines in the cerebrospinal fluid (CSF). A risk score was established: a score of 0 prepresenting negative HLA-DR, supine position and no fever prior to death.

Results

The IL-6 -176CG/CC genotype was found in 92.3% of the SIDS cases with positive score for all risk factors (p = 0.01). Infants with high HLA-DR score had high levels of IL-6 in the cerebrospinal fluid (>30 μg/L) (p = 0.005). Furthermore, the IL-8 SNPs -781 CT/TT genotypes and −251 AA/AT genotypes were observed in 93% of the SIDS cases with one or more of the risk factors present compared with SIDS cases no risk factors reported (p = 0.003 and p = 0.016, respectively).

Conclusion

This study adds further evidence to the hypothesis that there are genetically associated disturbances of immunological homoeostasis in SIDS.

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