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2013 ; 131
(2
): 419-33
Nephropedia Template TP
gab.com Text
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Twit Text #
English Wikipedia
?9-tetrahydrocannabinol impairs the inflammatory response to influenza infection:
role of antigen-presenting cells and the cannabinoid receptors 1 and 2
#MMPMID23152191
Karmaus PW
; Chen W
; Crawford R
; Kaplan BL
; Kaminski NE
Toxicol Sci
2013[Feb]; 131
(2
): 419-33
PMID23152191
show ga
?(9)-tetrahydrocannabinol (?(9)-THC) has potent immune modulatory properties and
can impair pathogen-induced immune defenses, which in part have been attributed
to ligation of the cannabinoid receptors 1 (CB(1)) and 2 (CB(2)). Most recently,
dendritic cells (DC) were identified for their potential to enhance
influenza-induced immunopathology in mice lacking CB(1) and CB(2) (CB(1)
(-/-)CB(2) (-/-)). This study focused on the modulation of the inflammatory
immune response to influenza by ?(9)-THC and the role of CB(1) and/or CB(2) as
receptor targets for ?(9)-THC. C57Bl/6 (wild type) and CB(1) (-/-)CB(2) (-/-)
mice were administered ?(9)-THC (75 mg/kg) surrounding the intranasal
instillation of A/PR/8/34 influenza virus. Three days post infection (dpi),
?(9)-THC broadly decreased expression levels of mRNA induced by the innate immune
response to influenza, suppressed the percentage of interferon-gamma
(IFN-?)-producing CD4(+) and interleukin-17-producing NK1.1(+) cells, and reduced
the influx of antigen-presenting cells (APC), including inflammatory myeloid
cells and monocytes/macrophages, into the lung in a CB(1)- and/or CB(2)-dependent
manner. ?(9)-THC had little effect on the expression of CD86, major
histocompatibility complex I (MHC I), and MHC II by APC isolated from the lung.
In vitro studies demonstrated that lipopolysaccharide (LPS)-induced maturation
was suppressed by ?(9)-THC in bone marrow-derived DC (bmDC). Furthermore,
antigen-specific IFN-? production by CD8(+) T cells after coculture was reduced
by ?(9)-THC treatment of bmDC in a CB(1)- and/or CB(2)-dependent manner.
Collectively, these studies suggest that ?(9)-THC potently suppresses myeloid
cell immune function, in a manner involving CB(1) and/or CB(2), thereby impairing
immune responses to influenza infection.