Surfactant protein D of the innate immune defence is inversely associated with human obesity and SP-D deficiency infers increased body weight in mice

G. L. Sorensen, J. V B Hjelmborg, R. Leth-Larsen, V. Schmidt, M. Fenger, Francis R Poulain, S. Hawgood, T. I A Sørensen, K. O. Kyvik, U. Holmskov

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Abstract

Surfactant protein D (SP-D) is a key regulator of pathogen-induced inflammation. SP-D is further involved in lipid homeostasis in mouse lung and circulation and recent data have demonstrated that the body mass index (BMI; in kg/m2) is influenced by genes in common with SP-D. The objective of the present study was to describe the association between serum SP-D and weight, waist circumference or BMI, and furthermore to observe body weight development in SP-D-deficient (Spd-/-) mice. As a part of the Danish population-based twin study (GEMINAKAR) on the metabolic syndrome, we analysed 1476 Danish twins for serum SP-D and investigated associations with weight, waist circumference and BMI by multiple regression analysis. Serum SP-D was significantly and inversely associated with weight (P = 0.001) and waist circumference in men (P < 0.001) and to BMI in both genders (P = 0.039 women, P < 0.001 men). The age-dependent increase in serum SP-D was most prominent in lean persons (BMI < 20). Spd-/- mice and wild-type mice were subjected to a feeding study and body weights were recorded in a time course over 24 weeks. Spd-/- mouse weight gain was significantly increased, with 90 mg/week (P < 0.0001) in males on normal chow. Fat percentage was significantly increased by 17% in the Spd-/- male mice (P = 0.003). We conclude, that there is an association between low levels or absent SP-D and obesity.

Original languageEnglish (US)
Pages (from-to)633-638
Number of pages6
JournalScandinavian Journal of Immunology
Volume64
Issue number6
DOIs
StatePublished - Dec 2006

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ASJC Scopus subject areas

  • Immunology

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Sorensen, G. L., Hjelmborg, J. V. B., Leth-Larsen, R., Schmidt, V., Fenger, M., Poulain, F. R., Hawgood, S., Sørensen, T. I. A., Kyvik, K. O., & Holmskov, U. (2006). Surfactant protein D of the innate immune defence is inversely associated with human obesity and SP-D deficiency infers increased body weight in mice. Scandinavian Journal of Immunology, 64(6), 633-638. https://doi.org/10.1111/j.1365-3083.2006.01853.x