Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\25125050
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Biochim+Biophys+Acta
2014 ; 1842
(11
): 2276-85
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Amyloid-?(1-42) protofibrils stimulate a quantum of secreted IL-1? despite
significant intracellular IL-1? accumulation in microglia
#MMPMID25125050
Terrill-Usery SE
; Mohan MJ
; Nichols MR
Biochim Biophys Acta
2014[Nov]; 1842
(11
): 2276-85
PMID25125050
show ga
Neuroinflammation is a characteristic feature of the Alzheimer's disease (AD)
brain. Significant inflammatory markers such as activated microglia and cytokines
can be found surrounding the extracellular senile plaques predominantly composed
of amyloid-? protein (A?). Several innate immune pathways, including Toll-like
receptors (TLRs) and the NLRP3 inflammasome, have been implicated in AD
inflammation. A? plays a primary role in activating these pathways which likely
contributes to the progressive neurodegeneration in AD. In order to better
understand the complexities of this interaction we investigated the inflammatory
response of primary microglia to A?(1-42) protofibrils. A?(1-42) protofibrils
triggered a time- and MyD88-dependent process that produced tumor necrosis factor
alpha (TNF?) and interleukin-1? (IL-1?) mRNA, and intracellular pro and mature
forms of IL-1? protein. The accumulation of both IL-1? forms indicated that
A?(1-42) protofibrils were able to prime and activate the NLRP3 inflammasome.
Surprisingly, A?-induced accumulation of intracellular mature IL-1? did not
translate into greater IL-1? secretion. Instead, we found that A? elicited a
quantized burst of secreted IL-1? and this process occurred even prior to A?
priming of the microglia suggesting a basal level of either pro or mature IL-1?
in the cultured primary microglia. The IL-1? secretion burst was rapid but not
sustained, yet could be re-evoked with additional A? stimulation. The findings
from this study demonstrated multiple sites of IL-1? regulation by A?(1-42)
protofibrils including TLR/MyD88-mediated priming, NLRP3 inflammasome activation,
and modulation of the IL-1? secretory process. These results underscore the
wide-ranging effects of A? on the innate immune response.