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- W2023343401 abstract "Botryllus schlosseri is a colonial ascidian whose asexually derived, clonally modular systems of zooids exhibit developmental synchrony. The blastogenic cycle culminates in a phase of programmed cell and zooid death called takeover, in which all functional zooids die over a 30 hr period, and are replaced by a new generation of individuals. Because of the weekly recurrence and magnitude of visceral death in this model organism, we have begun to characterize the mechanisms that govern takeover. Here we describe a monoclonal antibody (B3F12.9) that recognizes a novel 57 Kd polypeptide (under reducing conditions) localized to the perivisceral extracellular matrix (PVEM) of buds and zooids, as well as blood cells of Botryllus by immunofluorescence and immunogold labeling of tissue sections. During their active feeding phase, zooids exhibited a uniform labeling pattern of PVEM along their anteroposterior (A-P) axis. At the onset of takeover (T = 3 hr), B3F12.9 immunostaining became diffuse or absent at the anterior end, which paralleled the axis of contraction of the dying zooid, whereas the posterior end retained its labeling integrity. During mid (T = 15 hr) to late (T = 28 hr) takeover, issue damage was extensive, large blood macrophages and other B3F12.9 immunoreactive blood cells invaded the peribranchial cavity, whereas PVEM labeling gradually disappeared along the entire A-P axis. These findings indicate that takeover is a dynamic process in which extracellular matrix breakdown proceeds in a polarized fashion, beginning at the anterior end of each zooid and gradually propagating toward the posterior end. © 1992 Wiley-Liss, Inc." @default.
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- W2023343401 date "1992-05-01" @default.
- W2023343401 modified "2023-10-17" @default.
- W2023343401 title "A cyclical, developmentally-regulated death phenomenon in a colonial urochordate" @default.
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- W2023343401 doi "https://doi.org/10.1002/aja.1001940109" @default.
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