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Leukotrienes in brain: natural occurrence and induced changes.
Brain Research
|July 5, 1991
Summary
Sulfidopeptide leukotrienes (SP-LTs) are present in cerebrospinal fluid, with LTC4 being the major form. Platelet-activating factor (PAF) increases SP-LTs, suggesting a role in inflammation.
Area of Science:
- Neuroscience
- Immunology
- Biochemistry
Background:
- Sulfidopeptide leukotrienes (SP-LTs) are inflammatory mediators.
- Their presence and role in the central nervous system, specifically cerebrospinal fluid (CSF), are not fully understood.
Purpose of the Study:
- To measure SP-LTs in feline CSF under basal conditions and in response to stimuli.
- To investigate the role of SP-LTs in central inflammatory processes and fever mechanisms.
Main Methods:
- Radioimmunoassay was used to quantify SP-LTs (LTC4, LTE4, LTB4) in feline CSF.
- Levels were measured under basal conditions and after intracerebroventricular administration of arachidonic acid, platelet-activating factor (PAF), and pyrogens.
- The effects of indomethacin, a PAF antagonist (BN52021), and 5-lipoxygenase inhibitors were also examined.
Main Results:
- SP-LTs, primarily LTC4, were consistently detected in basal feline CSF.
- Intracerebroventricular administration of arachidonic acid and PAF significantly increased SP-LT levels.
- PAF-induced SP-LT elevation was reversed by PAF antagonists and 5-lipoxygenase inhibitors, but pyrogens did not affect LT levels.
Conclusions:
- SP-LTs are normal constituents of CSF, with LTC4 being the predominant species.
- The response to PAF suggests a role for SP-LTs in inflammatory processes within the central nervous system.
- SP-LTs do not appear to be involved in the central mechanisms of fever.