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2016 ; 15
(21
): 2943-2957
Nephropedia Template TP
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Mitotic cells form actin-based bridges with adjacent cells to provide
intercellular communication during rounding
#MMPMID27625181
Fykerud TA
; Knudsen LM
; Totland MZ
; Sørensen V
; Dahal-Koirala S
; Lothe RA
; Brech A
; Leithe E
Cell Cycle
2016[Nov]; 15
(21
): 2943-2957
PMID27625181
show ga
In order to achieve accurate chromosome segregation, eukaryotic cells undergo a
dramatic change in morphology to obtain a spherical shape during mitosis.
Interphase cells communicate directly with each other by exchanging ions and
small molecules via gap junctions, which have important roles in controlling cell
growth and differentiation. As cells round up during mitosis, the gap junctional
communication between mitotic cells and adjacent interphase cells ceases. Whether
mitotic cells use alternative mechanisms for mediating direct cell-cell
communication during rounding is currently unknown. Here, we have studied the
mechanisms involved in the remodeling of gap junctions during mitosis. We further
demonstrate that mitotic cells are able to form actin-based plasma membrane
bridges with adjacent cells during rounding. These structures, termed "mitotic
nanotubes," were found to be involved in mediating the transport of cytoplasm,
including Rab11-positive vesicles, between mitotic cells and adjacent cells.
Moreover, a subpool of the gap-junction channel protein connexin43 localized in
these intercellular bridges during mitosis. Collectively, the data provide new
insights into the mechanisms involved in the remodeling of gap junctions during
mitosis and identify actin-based plasma membrane bridges as a novel means of
communication between mitotic cells and adjacent cells during rounding.