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2016 ; 197
(6
): 2390-9
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English Wikipedia
Blood-Borne Lipopolysaccharide Is Rapidly Eliminated by Liver Sinusoidal
Endothelial Cells via High-Density Lipoprotein
#MMPMID27534554
Yao Z
; Mates JM
; Cheplowitz AM
; Hammer LP
; Maiseyeu A
; Phillips GS
; Wewers MD
; Rajaram MV
; Robinson JM
; Anderson CL
; Ganesan LP
J Immunol
2016[Sep]; 197
(6
): 2390-9
PMID27534554
show ga
During Gram-negative bacterial infections, excessive LPS induces inflammation and
sepsis via action on immune cells. However, the bulk of LPS can be cleared from
circulation by the liver. Liver clearance is thought to be a slow process
mediated exclusively by phagocytic resident macrophages, Kupffer cells (KC).
However, we discovered that LPS disappears rapidly from the circulation, with a
half-life of 2-4 min in mice, and liver eliminates about three quarters of LPS
from blood circulation. Using microscopic techniques, we found that ?75% of
fluor-tagged LPS in liver became associated with liver sinusoidal endothelial
cells (LSEC) and only ?25% with KC. Notably, the ratio of LSEC-KC-associated LPS
remained unchanged 45 min after infusion, indicating that LSEC independently
processes the LPS. Most interestingly, results of kinetic analysis of LPS
bioactivity, using modified limulus amebocyte lysate assay, suggest that
recombinant factor C, an LPS binding protein, competitively inhibits high-density
lipoprotein (HDL)-mediated LPS association with LSEC early in the process.
Supporting the previous notion, 3 min postinfusion, 75% of infused fluorescently
tagged LPS-HDL complex associates with LSEC, suggesting that HDL facilitates LPS
clearance. These results lead us to propose a new paradigm of LSEC and HDL in
clearing LPS with a potential to avoid inflammation during sepsis.