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 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
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\22555620
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Age+(Dordr)
2013 ; 35
(3
): 807-20
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Blueberry consumption prevents loss of collagen in bone matrix and inhibits
senescence pathways in osteoblastic cells
#MMPMID22555620
Zhang J
; Lazarenko OP
; Blackburn ML
; Badger TM
; Ronis MJ
; Chen JR
Age (Dordr)
2013[Jun]; 35
(3
): 807-20
PMID22555620
show ga
Ovariectomy (OVX)-induced bone loss has been linked to increased bone turnover
and higher bone matrix collagen degradation as the result of osteoclast
activation. However, the role of degraded collagen matrix in the fate of resident
bone-forming cells is unclear. In this report, we show that OVX-induced bone loss
is associated with profound decreases in collagen 1 and Sirt1. This was
accompanied by increases in expression and activity of the senescence marker
collagenase and expression of p16/p21 in bone. Feeding a diet supplemented with
blueberries (BB) to pre-pubertal rats throughout development or only prior to
puberty [postnatal day 21 (PND21) to PND34] prevents OVX-induced effects on
expression of these molecules at PND68. In order to provide more evidence and
gain a better understanding on the association between bone collagen matrix and
resident bone cell fate, in vitro studies on the cellular senescence pathway
using primary calvarial cells and three cell lines (ST2 cells, OB6, and MLO-Y4)
were conducted. We found that senescence was inhibited by collagen in a
dose-response manner. Treatment of cells with serum from OVX rats accelerated
osteoblastic cell senescence pathways, but serum from BB-fed OVX rats had no
effect. In the presence of low collagen or treatment with OVX rat serum, ST2
cells exhibited higher potential to differentiate into adipocytes. Finally, we
demonstrated that bone cell senescence is associated with decreased Sirt1
expression and activated p53, p16, and p21. These results suggest that (1) a
significant prevention of OVX-induced bone cell senescence from adult rats can
occur after only 14 days consumption of a BB-containing diet immediately prior to
puberty, and (2) the molecular mechanisms underlying this effect involves, at
least in part, prevention of collagen degradation.