(H) Past due stage cytokinesis, with a narrow connection bridge in the plane of division (red arrowheads). junctions separating the daughter cells within multicellular tubes form through the alteration of pre-existing junctions, and the lumen is usually retained throughout mitosis. We also describe variations in the progression of cytokinesis: while membrane furrowing between daughter cells is usually symmetric in unicellular tubes, we found that it is asymmetric in those multicellular tubes that contained a taut intercellular junction close to the plane of division. Our findings illustrate that during the course of normal development, the cell division machinery can accommodate multiple tube architectures, thereby avoiding disruptions to the vascular network. culture, and the cellular and molecular mechanisms of the mitotic machinery are well comprehended. The first step is usually mitotic rounding, a generic feature of cell division that is driven by changes in the shape and the rigidity of the cell cortex (Cadart et al., 2014). It has been shown that this actomyosin-driven process is necessary for the proper assembly, maintenance VU0134992 and orientation of the VU0134992 central spindle (Kunda et al., 2008; Lancaster et al., 2013; Rosenblatt et al., 2004). Spindle orientation subsequently defines the plane of cell division through the accumulation of phosphorylated Myosin II at the plasma membrane, which drives the assembly of a contractile ring (reviewed in Fededa and Gerlich, 2012; Green et al., 2012; Levayer and Lecuit, 2012). The next step is the partitioning into two daughter cells, or cytokinesis, which takes place shortly after chromosome segregation. During cytokinesis, the actomyosin ring contracts and eventually collapses to a small intercellular bridge, the so called midbody (Green et al., 2012). Finally, the severing of the constricted plasma membrane, a process known as abscission, marks the end of mitosis. Within epithelial sheets or tubes, dividing cells maintain the adherens junctions (AJs), which confer tissue integrity (Bourdages and Maddox, 2013; Nakajima et TLN1 al., 2013). However AJs are extensively reconstructed during mitotic rounding and cytokinesis (Harris and Tepass, 2010; Herszterg et al., 2014). The neighboring ECs exert forces around the mitotic cell through cadherin proteins (the core of AJs) that are, in turn, linked to the actomyosin cortex (Harris and Tepass, 2010). Morphogenetic movements such as cell intercalation and invagination require a degree of synchronization between junctional re-arrangement and mitosis (Kondo and Hayashi, 2013; Levayer and Lecuit, 2012). Because of their three-dimensional structure, tubular networks have got a more complicated morphology than epithelial bed linens. Therefore, the department of elongated and lumenized cells may necessitate some adaptations from the mitotic equipment to be able to accommodate their peculiar geometry as was lately shown in a report from the larval trachea program (Denes et al., 2015). As the actomyosin bands that get cytokinesis in the epithelia have the ability to symmetrically deform the AJs of both cells that flank the rising junction (Founounou et al., 2013; Lecuit and Guillot, 2013; Herszterg et al., 2013), during cytokinesis in tracheal pipes, the membrane furrows asymmetrically in the comparative aspect from the cell that’s proximal towards the nucleus, and the brand new junction after that extends across the lumen until it connects and fuses with another membrane. We discovered that in the redecorating dorsal tracheal branches, such asymmetric junction development may be the norm, presumably as the particular geometry as well as the rigidity from the pipes favor this result (Denes et al., 2015). The integration of proliferative and morphogenetic procedures is certainly therefore crucial for correct vessel morphogenesis (Zeng et al., 2007). Nevertheless, it is not investigated at length how EC department proceeds within a powerful environment, where lumen development and cell rearrangements take place concomitantly and vessel integrity must be maintained. Here, we investigated the interplay between cell division, junctional rearrangement, actin distribution and lumen dynamics during SA morphogenesis VU0134992 in the zebrafish, using an array of fluorescently labeled markers and confocal live imaging. We find that membrane.