Pre-formed pyrogenic factor released by lipopolysaccharide stimulated macrophages
Author Information
Author(s): A. R. Zampronio, M. C. C. Melo, C. A. A. Silva, I. R. Peld, S. J. Hopkins, G. E. P. Souza
Primary Institution: Laboratory of Pharmacology, Faculty of Pharmaceutical Sciences, University of São Paulo
Hypothesis
Can macrophages release a pyrogenic factor that induces fever and affects serum metal levels?
Conclusion
Macrophages release a pre-formed pyrogenic factor that induces fever and reduces serum iron and zinc levels, independent of known cytokines.
Supporting Evidence
- Supernatants from LPS-stimulated macrophages induced a concentration-dependent fever in rats.
- Injection of the highest concentration of cytokines detected in the supernatants did not induce fever.
- Boiling the supernatant abolished the fever and reduced neutrophilia.
Takeaway
The study found that certain immune cells can release a substance that makes you feel hot and affects metal levels in the blood, even without the usual signals from other chemicals.
Methodology
The study involved injecting supernatants from LPS-stimulated macrophages into rats and measuring temperature and serum metal levels.
Limitations
The study primarily used male Wistar rats, which may limit the generalizability of the findings to other populations.
Participant Demographics
Male Wistar rats weighing 180-200 g.
Statistical Information
Statistical Significance
p<0.05
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