Trafficking Kinesin Protein (TRAK)-mediated Transport of Mitochondria in Axons of Hippocampal Neurons*


In neurons, the proper distribution of mitochondria is essential because of a requirement for high energy and calcium buffering during synaptic neurotransmission. The efficient, regulated transport of mitochondria along axons to synapses is therefore crucial for maintaining function. The trafficking kinesin protein (TRAK)/Milton family of proteins comprises kinesin adaptors that have been implicated in the neuronal trafficking of mitochondria via their association with the mitochondrial protein Miro and kinesin motors. In this study, we used gene silencing by targeted shRNAi and dominant negative approaches in conjunction with live imaging to investigate the contribution of endogenous TRAKs, TRAK1 and TRAK2, to the transport of mitochondria in axons of hippocampal pyramidal neurons. We report that both strategies resulted in impairing mitochondrial mobility in axonal processes. Differences were apparent in terms of the contribution of TRAK1 and TRAK2 to this transport because knockdown of TRAK1 but not TRAK2 impaired mitochondrial mobility, yet both TRAK1 and TRAK2 were shown to rescue transport impaired by TRAK1 gene knock-out. Thus, we demonstrate for the first time the pivotal contribution of the endogenous TRAK family of kinesin adaptors to the regulation of mitochondrial mobility

Similar works

Full text

PubMed CentralProvided a free PDF (195.62 KB)
Last time updated on July 8, 2012View original full text link

This paper was published in PubMed Central.

Having an issue?

Is data on this page outdated, violates copyrights or anything else? Report the problem now and we will take corresponding actions after reviewing your request.