Document Detail

The spleen of the African lungfish Protopterus annectens: freshwater and aestivation.
MedLine Citation:
PMID:  22752121     Owner:  NLM     Status:  Publisher    
We describe the structure of the spleen of the African lungfish Protopterus annectens in freshwater conditions, and after 6 months of aestivation. The spleen is formed by cortical tissue that surrounds the splenic parenchyma. The cortex is a reticulum that contains two types of granulocytes, developing and mature plasma cells, and melanomacrophage centres (MMCs). The parenchyma is divided into lobules that show a subcapsular sinus and areas of red pulp and white pulp. Red pulp contains vascular sinuses and atypical cords formed by delicate trabeculae. White pulp also contains vascular sinuses and cords. Structural data indicate that red pulp is involved in erythropoiesis, destruction of effete erythrocytes, and plasma cell differentiation. White pulp appears to be involved in the production of immune responses. Macrophages and sinus endothelial cells constitute the reticulo-endothelial system of the spleen. After aestivation, the number of MMCs increases, and spleen tissue is infiltrated by lymphocytes, granulocytes, and monocytes. Also, white pulp is reduced, and sinus endothelial cells undergo vacuolar degeneration. Lungfish spleen shares structural characteristics with secondary lymphoid organs of both ectothermic and endothermic vertebrates, but appears to have evolved in unique ways.
José M Icardo; Wai P Wong; Elvira Colvee; Ai M Loong; Yuen K Ip
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-3
Journal Detail:
Title:  Cell and tissue research     Volume:  -     ISSN:  1432-0878     ISO Abbreviation:  -     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-7-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0417625     Medline TA:  Cell Tissue Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Anatomy and Cell Biology, Faculty of Medicine, University of Cantabria, c/ Cardenal Herrera Oria, s/n, 39011, Santander, Spain,
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