We have shown previously that intracellular phagosome movement requires microtubules. Here we provide evidence that within cells phagosomes display two different kinds of microtubule-based movements in approximately equal proportions. The first type occurs predominantly in the cell periphery, often shortly after the phagosome is formed, and at speeds below 0.1 microm/second. The second is faster (0.2-1.5 micron/second) and occurs mainly after phagosomes have reached the cell interior. Treating cells with nanomolar concentrations of taxol or nocodazole alters microtubule dynamics without affecting either total polymer mass or microtubule organisation. Such treatments slow the accumulation of phagosomes in the perinuclear region and reduce the number of slow movements by up to 50% without affecting the frequency of fast movements. This suggests that a proportion of slow movements are mediated by microtubule dynamics while fast movements are powered by microtubule motors. In macrophages, interphase microtubules radiate from the microtubule organising centre with their plus-end towards the cell periphery. To understand the behaviour of ‘early’ phagosomes at the cell periphery we investigated their ability to bind microtubule plus-ends in vitro. We show that early phagosomes have a strong preference for microtubule plus-ends, whereas ‘late’ phagosomes do not, and that plus-end affinity requires the presence of microtubule-associated proteins within cytosol. We suggest that phagosomes can bind to the plus-ends of dynamic microtubules and move by following their shrinkage or growth.
A role for microtubule dynamics in phagosome movement
A. Blocker, G. Griffiths, J.C. Olivo, A.A. Hyman, F.F. Severin; A role for microtubule dynamics in phagosome movement. J Cell Sci 1 February 1998; 111 (3): 303–312. doi: https://doi.org/10.1242/jcs.111.3.303
Download citation file:
Advertisement
Cited by
Follow us on Instagram
Cell science is bursting with beautiful images and over on Instagram, we're showing them off!
Follow JCS and FocalPlane on Instagram for stories and techniques across cell biology.
Mole - The Corona Files
"There are millions of people around the world who continue to believe that the Terrible Pandemic is a hoax."
Mole continues to offer his wise words to researchers on how to manage during the COVID-19 pandemic.
Life after a Travelling Fellowship
Sina Krokowski is a postdoc in Andres Floto's lab, investigating the cell biology underlying host-pathogen interactions. In 2015, Sina used a Travelling Fellowship to visit the Carballido-López lab in Paris where she learned a new technique that was vital for her PhD. We caught up with Sina to hear about the ongoing impact of the trip on her scientific career since.
Upcoming grant deadlines
Grants awarded by The Company of Biologists help scientists travel, attend events and host sustainable activities. Make a note of the upcoming application deadlines and find out more about the grants on offer:
Sustainable Conferencing Grants
17 May 2021
Travelling Fellowships
31 May 2021
Scientific Meeting Grants
4 June 2021