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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Mol+Endocrinol
2013 ; 50
(3
): 375-87
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Thyroid-specific inactivation of KIF3A alters the TSH signaling pathway and leads
to hypothyroidism
#MMPMID23511952
D'Amico E
; Gayral S
; Massart C
; Van Sande J
; Reiter JF
; Dumont JE
; Robaye B
; Schurmans S
J Mol Endocrinol
2013[Jun]; 50
(3
): 375-87
PMID23511952
show ga
Kinesins, including the kinesin 2/KIF3 molecular motor, play an important role in
intracellular traffic and can deliver vesicles to distal axon terminals, to
cilia, to nonpolarized cell surfaces or to epithelial cell basolateral membranes,
thus taking part in the establishment of cellular polarity. We report here the
consequences of kinesin 2 motor inactivation in the thyroid of 3-week-old
Kif3a(?)(/flox) Pax8(Cre/)(+) mutant mice. Our results indicate first that
3-week-old Pax8(Cre/)(+) mice used in these experiments present minor thyroid
functional defects resulting in a slight increase in circulating bioactive TSH
and intracellular cAMP levels, sufficient to maintain blood thyroxine levels in
the normal range. Second, Kif3a inactivation in thyrocytes markedly amplified the
phenotype observed in Pax8(Cre/)(+) mice, resulting in altered TSH signaling
upstream of the second messenger cAMP and mild hypothyroidism. Finally, our
results in mouse embryonic fibroblasts indicate that Kif3a inactivation in the
absence of any Pax8 gene alteration leads to altered G protein-coupled receptor
plasma membrane expression, as shown for the ?2 adrenergic receptor, and we
suggest that a similar mechanism may explain the altered TSH signaling and mild
hypothyroidism detected in Kif3a(?)(/flox) Pax8(Cre/)(+) mutant mice.