Journal
PLOS ONE
Volume 8, Issue 8, Pages -Publisher
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0072204
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Funding
- Swedish Research Council [K2008-65X-20753-01-4]
- Swedish federal government under the LUA/ALF
- Swedish Foundation for Strategic Research
- Ake Wiberg Foundation
- Foundation of the National Board of Health
- Foundations of the National Board of Welfare
- Emelle Foundation
- Swedish Knowledge Foundation through the Industrial PhD program in Medical Bioinformatics at Corporate Alliances, Karolinska Institutet
- Jeansson Foundations
- Magnus Bergvall Foundation
- Royal Physiographic Society (Nilsson-Ehle Foundation)
- Tore Nilsson Foundation
- Arosenius Foundation
- Clas Groschinsky Foundation
- Torsten and Ragnar Soderberg Foundation
- VINNOVA-VINNMER program
- Sahlgrenska University Hospital Foundation
- Langmanska foundation
- Wilhelm and Martina Lundgren foundation
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Obesity is associated with a low-grade inflammation including moderately increased serum levels of the acute phase protein serum amyloid A (SAA). In obesity, SAA is mainly produced from adipose tissue and serum levels of SAA are associated with insulin resistance. SAA has been described as a chemoattractant for inflammatory cells and adipose tissue from obese individuals contains increased numbers of macrophages. However, whether adipose tissue-derived SAA can have a direct impact on macrophage infiltration in adipose tissue or the development of insulin resistance is unknown. The aim of this study was to investigate the effects of adipose tissue-derived SAA1 on the development of insulin resistance and obesity-related inflammation. We have previously established a transgenic mouse model expressing human SAA1 in the adipose tissue. For this report, hSAA1(+/-) transgenic mice and wild type mice were fed with a high fat diet or normal chow. Effects of hSAA1 on glucose metabolism were assessed using an oral glucose tolerance test. Real-time PCR was used to measure the mRNA levels of macrophage markers and genes related to insulin sensitivity in adipose tissue. Cytokines during inflammation were analyzed using a Proinflammatory 7-plex Assay. We found similar insulin and glucose levels in hSAA1 mice and wt controls during an oral glucose tolerance test and no decrease in mRNA levels of genes related to insulin sensitivity in adipose tissue in neither male nor female hSAA1 animals. Furthermore, serum levels of proinflammatory cytokines and mRNA levels of macrophage markers in adipose tissue were not increased in hSAA1 mice. Hence, in this model we find no evidence that adipose tissue-derived hSAA1 influences the development of insulin resistance or obesity-related inflammation.
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