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Hematopoiesis at the onset of metamorphosis: terminal differentiation and dissociation of the Drosophila lymph gland

Content Provider	Springer Nature Link
Author	Grigorian, Melina Mandal, Lolitika Hartenstein, Volker
Copyright Year	2011
Abstract	The Drosophila melanogaster hematopoietic organ, called lymph gland, proliferates and differentiates throughout the larval period. The lymph gland of the late larva is comprised of a large primary lobe and several smaller secondary lobes. Differentiation into two types of hemocytes, plasmatocytes and crystal cells, is confined to the outer layer (cortical zone) of the primary lobe; the center of the primary lobe (medullary zone), as well as the secondary lobes, contain only proliferating prohemocytes. A small cluster of cells located at the posterior tip of the primary lobe serves as a signaling center (PSC) that inhibits precocious differentiation of the medullary zone. The larval lymph gland is stabilized by layers of extracellular matrix (basement membranes) that surround individual hemocytes, groups of hemocytes, as well as the lymph gland as a whole. In this paper, we investigated the events shaping the lymph gland in the early pupa. The lymph gland dissociates and hemocytes disperse during the first 12 h after puparium formation (APF), leaving behind empty husks of basement membrane. Prior to lymph gland dissociation, cells of the medullary zone differentiate, expressing the early differentiation marker Peroxidasin (Pxn), as well as, in part, the late differentiation marker P1. Cells of the PSC spread throughout the pupal lymph gland prior to their dispersal. Cells of the secondary lobes undergo a rapid phase of proliferation that lasts until 8 h APF, followed by expression of Pxn and dispersal. These hemocytes do not express P1, indicating that they disperse prior to full maturation.
Starting Page	121
Ending Page	131
Page Count	11
File Format	PDF
ISSN	0949944X
Journal	Development Genes and Evolution
Volume Number	221
Issue Number	3
e-ISSN	1432041X
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-04-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Drosophila Blood Lymph gland Metamorphosis Biochemistry Cell Biology Animal Genetics and Genomics Developmental Biology Neurosciences
Content Type	Text
Resource Type	Article
Subject	Genetics Developmental Biology

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Hematopoiesis at the Onset of Metamorphosis: Terminal Differentiation and Dissociation of the Drosophila Lymph Gland

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