Quantification of cytokines and inflammatory mediators in samples of nasopharyngeal secretions with unknown dilution

Terho Heikkinen, Mohan Shenoy, Randall M. Goldblum, Tasnee Chonmaitree

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

In the study of inflammatory mechanisms in the upper respiratory tract, the unknown dilution of collected samples of nasal secretions poses a serious problem for interpretation of the measured concentrations of various substances in the specimens. We investigated the magnitude of the dilution problem in a true clinical research situation and determined the validity of using the levels of total protein, albumin, and secretory IgA in nasal secretions to correct for the unknown dilution. The study samples consisted of simultaneously obtained nasopharyngeal aspirates and nasal lavage specimens from 52 children with upper respiratory tract infection. The dilution factors of the nasal lavage specimens varied widely between 1.8 and 432 (median, 11.2). Of the three proteins studied, total protein had the narrowest intersubject variation in the nasal secretions of the children and thus seemed to provide the best standardization method for comparing levels of substances between individuals. Concentrations of IL-6 standardized with total protein correlated significantly better with the true IL-6 concentrations in the nasal secretions than did IL-6 levels measured in the nasal lavage specimens without standardization (p = 0.049). These findings suggest that the most common current practice of measuring substances in nasopharyngeal specimens, i.e. measuring without correction for the dilution, may produce 'false-negative' results. Potentially important information on inflammatory mechanisms may be undetected if false-negative results mask real differences between groups. The use of exogenous markers of dilution might improve the accuracy of quantifying substances in nasal secretions.

Original languageEnglish (US)
Pages (from-to)230-234
Number of pages5
JournalPediatric Research
Volume45
Issue number2
StatePublished - Feb 1999

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Nose
Nasal Lavage
Cytokines
Interleukin-6
Proteins
Secretory Immunoglobulin A
Masks
Respiratory Tract Infections
Respiratory System
Albumins
Research

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health

Cite this

Heikkinen, T., Shenoy, M., Goldblum, R. M., & Chonmaitree, T. (1999). Quantification of cytokines and inflammatory mediators in samples of nasopharyngeal secretions with unknown dilution. Pediatric Research, 45(2), 230-234.

Quantification of cytokines and inflammatory mediators in samples of nasopharyngeal secretions with unknown dilution. / Heikkinen, Terho; Shenoy, Mohan; Goldblum, Randall M.; Chonmaitree, Tasnee.

In: Pediatric Research, Vol. 45, No. 2, 02.1999, p. 230-234.

Research output: Contribution to journalArticle

Heikkinen, T, Shenoy, M, Goldblum, RM & Chonmaitree, T 1999, 'Quantification of cytokines and inflammatory mediators in samples of nasopharyngeal secretions with unknown dilution', Pediatric Research, vol. 45, no. 2, pp. 230-234.
Heikkinen, Terho ; Shenoy, Mohan ; Goldblum, Randall M. ; Chonmaitree, Tasnee. / Quantification of cytokines and inflammatory mediators in samples of nasopharyngeal secretions with unknown dilution. In: Pediatric Research. 1999 ; Vol. 45, No. 2. pp. 230-234.
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