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2015 ; 10
(9
): e0138012
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Myosin 1b Regulates Amino Acid Transport by Associating Transporters with the
Apical Plasma Membrane of Kidney Cells
#MMPMID26361046
Komaba S
; Coluccio LM
PLoS One
2015[]; 10
(9
): e0138012
PMID26361046
show ga
Amino acid transporters (AATers) in the brush border of the apical plasma
membrane (APM) of renal proximal tubule (PT) cells mediate amino acid transport
(AAT). We found that the membrane-associated class I myosin myosin 1b (Myo1b)
localized at the apical brush border membrane of PTs. In opossum kidney (OK) 3B/2
epithelial cells, which are derived from PTs, expressed rat Myo1b-GFP colocalized
in patched microvilli with expressed mouse V5-tagged SIT1 (SIT1-V5), which
mediates neutral amino acid transport in OK cells. Lentivirus-mediated delivery
of opossum Myo1b-specific shRNA resulted in knockdown (kd) of Myo1b expression,
less SIT1-V5 at the APM as determined by localization studies, and a decrease in
neutral AAT as determined by radioactive uptake assays. Myo1b kd had no effect on
Pi transport or noticeable change in microvilli structure as determined by
rhodamine phalloidin staining. The studies are the first to define a
physiological role for Myo1b, that of regulating renal AAT by modulating the
association of AATers with the APM.