4.4 Article

Alternative splicing results in RET isoforms with distinct trafficking properties

期刊

MOLECULAR BIOLOGY OF THE CELL
卷 23, 期 19, 页码 3838-3850

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AMER SOC CELL BIOLOGY
DOI: 10.1091/mbc.E12-02-0114

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  1. Canadian Institutes for Health Research [MOP49602]
  2. Terry Fox Foundation Studentship through the National Cancer Institute of Canada
  3. Terry Fox Foundation Training Program in Transdisciplinary Cancer Research

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RET encodes a receptor tyrosine kinase that is essential for spermatogenesis, development of the sensory, sympathetic, parasympathetic, and enteric nervous systems and the kidneys, as well as for maintenance of adult midbrain dopaminergic neurons. RET is alternatively spliced to encode multiple isoforms that differ in their C-terminal amino acids. The RET9 and RET51 isoforms display unique levels of autophosphorylation and have differential interactions with adaptor proteins. They induce distinct gene expression patterns, promote different levels of cell differentiation and transformation, and play unique roles in development. Here we present a comprehensive study of the subcellular localization and trafficking of RET isoforms. We show that immature RET9 accumulates intracellularly in the Golgi, whereas RET51 is efficiently matured and present in relatively higher amounts on the plasma membrane. RET51 is internalized faster after ligand binding and undergoes recycling back to the plasma membrane. This differential trafficking of RET isoforms produces a more rapid and longer duration of signaling through the extracellular-signal regulated kinase/mitogen-activated protein kinase pathway downstream of RET51 relative to RET9. Together these differences in trafficking properties contribute to some of the functional differences previously observed between RET9 and RET51 and establish the important role of intracellular trafficking in modulating and maintaining RET signaling.

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