Abstract:
:The hypothalamic-pituitary-adrenal (HPA) axis is stimulated during immune and inflammatory processes. Interleukin 1beta (IL-1beta) and lipopolysaccharide (LPS) are known to be potent stimulators of this axis. During postnatal development, the rat seems to be hyporesponsive to many stimuli. The effects of repeated systemic injections of IL-1beta and LPS on the HPA axis were investigated in neonatal rats. IL-1beta (0.02 microg/pup, administered twice daily from postnatal day 1 to 4) induced marked elevation in plasma corticosterone (CORT) level as compared to controls and LPS groups (0.4 microg or 1.2 microg LPS/pup, injected once daily from postnatal day 1 to 4). Adrenal wet weight was significantly higher, thymus weight was significantly lower. In contrast to the organ weights, there were no differences in CORT concentrations between LPS-exposed groups and controls. However, the weights of the adrenals in rats treated with LPS were significantly increased in a dose-dependent manner as compared to controls. The high LPS dose was associated with significantly lower thymus weights as compared to controls and 0.4 microg LPS rats. Thymus weights were significantly lower following IL-1beta- than LPS-administration. It is supposed that a developing endotoxin tolerance could account for the observed absence of CORT rise after the last LPS injection.
journal_name
Cytokinejournal_title
Cytokineauthors
Bumiller A,Götz F,Rohde W,Dörner Gdoi
10.1006/cyto.1999.0423keywords:
subject
Has Abstractpub_date
1999-03-01 00:00:00pages
225-30issue
3eissn
1043-4666issn
1096-0023pii
S1043-4666(99)90423-4journal_volume
11pub_type
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