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2016 ; 2
(12
): 91-97
Nephropedia Template TP
gab.com Text
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English Wikipedia
RAPAMYCIN INCREASES LENGTH AND MECHANOSENSORY FUNCTION OF PRIMARY CILIA IN RENAL
EPITHELIAL AND VASCULAR ENDOTHELIAL CELLS
#MMPMID28529994
Sherpa RT
; Atkinson KF
; Ferreira VP
; Nauli SM
Int Educ Res J
2016[Dec]; 2
(12
): 91-97
PMID28529994
show ga
Primary cilia arebiophysically-sensitive organelles responsible for sensing
fluid-flow and transducing this stimulus into intracellular responses. Previous
studies have shown that the primary cilia mediate flow-induced calcium influx,
and sensitivity of cilia function to flow is correlated to cilia length. Cells
with abnormal cilia length or function can lead to a host of diseases that are
collectively termed as ciliopathies. Rapamycin, a potent inhibitor of mTOR
(mammalian target of rapamycin), has been demonstrated to be a potential
pharmacological agent against the aberrant mTOR signaling seen in ciliopathies
such as polycystic kidney disease (PKD) and tuberous sclerosis complex (TSC).
Here we look at the effects of rapamycin on ciliary length and function for the
first time. Compared to controls, primary cilia in rapamycin-treated porcine
renal epithelial and mouse vascular endothelial cells showed a significant
increase in length. Graded increases in fluid-shear stress further indicates that
rapamycin enhances cilia sensitivity to fluid flow. Treatment with rapamycin led
to G0 arrest in porcine epithelial cells while no significant change in cell
cycle were observed in rapamycin-treated mouse epithelial or endothelial cells,
indicating a species-specific effect of rapamycin. Given the previousin vitro and
in vivo studies establishing rapamycin as a potential therapeutic agent for
ciliopathies, such as PKD and TSC, our studies show that rapamycin enhances
ciliary function and sensitivity to fluid flow. The results of our studies
suggest a potential ciliotherapeutic effect of rapamycin.