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Title: Lympho-granulocytic tissue associated with the wall of the spiral valve in the African lungfish Protopterus annectens
Authors: Icardo, J.M.
Wong, W.P.
Colvee, E.
Loong, A.M.
Zapata, A.G.
Ip, Y.K. 
Keywords: Aestivation
Lympho-granulocytic tissue
Protopterus annectens
Spiral valve
Issue Date: Feb-2014
Citation: Icardo, J.M., Wong, W.P., Colvee, E., Loong, A.M., Zapata, A.G., Ip, Y.K. (2014-02). Lympho-granulocytic tissue associated with the wall of the spiral valve in the African lungfish Protopterus annectens. Cell and Tissue Research 355 (2) : 397-407. ScholarBank@NUS Repository.
Abstract: We describe the structure of the lympho-granulocytic tissue associated with the wall of the spiral valve of the African lungfish Protopterus annectens. The study was performed under freshwater conditions and after 6 months of aestivation. The lympho-granulocytic tissue consists of nodes surrounded by reticular tissue. The nodes are formed by an outer and an inner component separated by a thin collagenous layer. The outer component is a reticular-like tissue that contains two types of granulocytes, developing and mature plasma cells and melanomacrophage centres (MMCs). The inner component, the parenchyma, contains a meshwork of trabeculae and vascular sinusoids and shows dark and pale areas. The dark areas contain diffuse lymphoid tissue, with a large number of mitoses and plasma cell clusters. The pale areas contain a small number of macrophages and lymphocytes. Macrophages and sinus endothelial cells are filled with haemosiderin granules and appear to form part of the reticuloendothelial system of the lungfish. The reticular tissue houses granulocytes, plasma cells and MMCs and might serve for the housing and maturation of cells of the white series. After aestivation, the nodes undergo lymphocyte depletion, the suppression of mitosis, granulocyte invasion and the occurrence of cell death. By contrast, few histological changes occur in the reticular tissue. Whereas the nodes appear to be involved in lymphocyte proliferation and plasma cell maturation, the function of the reticular tissue remains obscure. © 2013 Springer-Verlag Berlin Heidelberg.
Source Title: Cell and Tissue Research
ISSN: 0302766X
DOI: 10.1007/s00441-013-1746-z
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