Functional heterogeneity of the kupffer cell population is involved in the mechanism of gadolinium chloride in rats administered endotoxin.
BACKGROUND
The purpose of this study was to determine if evidence of functional heterogeneity between subtypes of the Kupffer cell (KC) may be involved in the mechanism of the protective effect of gadolinium chloride (GdCl3) in endotoxemia.


METHODS
Rats pretreated with or without GdCl3 were administered lipopolysaccharide (LPS) or vehicle. Serum and liver tissues were collected after LPS administration for cytokine measurements and pathological and immunohistochemical evaluation.


RESULTS
After LPS administration, increases in expression of TNF-alpha and IL-6 mRNA in the liver were blunted significantly by GdCl3. In control liver tissue, ED2-positive cells were a predominant fraction, with a few ED1-positive cells, and GdCl3 eliminated only ED2-positive cells. Further, ED2-positive cells were larger in size than ED1-positive ones. Importantly, the number of ED1-positive cells in the liver was increased about threefold in the control group but not in the GdCl3 group after LPS injection. Intermediate or large KCs isolated by counterflow centrifugal elutriation showed greater capacity for phagocytosis and production of superoxide and TNF-alpha than small ones. In contrast, IL-6 production was increased to a greater extent in small than in intermediate or large cells. GdCl3 eliminated the intermediate or large KC subpopulation predominantly.


CONCLUSIONS
Collectively, functional heterogeneity of the KC population was involved in the mechanism of the protective effects of GdCl3 in endotoxemia. TNF-alpha derived from activated intermediate or large KCs may activate small KCs and the latter may be recruited to other organs, such as lungs and kidneys, and produce a large amount of IL-6, leading to multiple organ failure.
First Department of Surgery, Yamanashi Medical University, Yamanashi, 409-3898, Japan.
Hiroshi
H
Kono
Hideki
H
Fujii
Masami
M
Asakawa
Masayuki
M
Yamamoto
Akira
A
Maki
Masanori
M
Matsuda
Ivan
I
Rusyn
Yoshiro
Y
Matsumoto
D000410:Alanine Transaminase / Q000097:blood; D000818:Animals; D000893:Anti-Inflammatory Agents / Q000494:pharmacology*; D000911:Antibodies, Monoclonal; D019446:Endotoxemia / Q000188:drug therapy* / Q000401:mortality / Q000473:pathology; D005682:Gadolinium / Q000494:pharmacology*; D015870:Gene Expression / Q000187:drug effects; D018740:Genetic Heterogeneity; D007150:Immunohistochemistry; D015850:Interleukin-6 / Q000235:genetics / Q000378:metabolism; D007728:Kupffer Cells / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism*; D008070:Lipopolysaccharides / Q000494:pharmacology; D008099:Liver / Q000473:pathology; D008297:Male; D009102:Multiple Organ Failure / Q000209:etiology / Q000503:physiopathology; D010587:Phagocytosis / Q000502:physiology; D012333:RNA, Messenger / Q000032:analysis; D051381:Rats; D017207:Rats, Sprague-Dawley; D013481:Superoxides / Q000378:metabolism; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics / Q000378:metabolism
D000893:Anti-Inflammatory Agents; D000911:Antibodies, Monoclonal; D015850:Interleukin-6; D008070:Lipopolysaccharides; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha; D013481:Superoxides; D005682:Gadolinium; D000410:Alanine Transaminase; C038958:gadolinium chloride