Could the myoepithelial cells of Riftia pachyptila be a haematopoietic site for the coelomic haemoglobin?
Claudinot, S.; Andersen, A.C.; Jouin-Toulmond, C. (1997). Could the myoepithelial cells of Riftia pachyptila be a haematopoietic site for the coelomic haemoglobin?, in: Biologie des sources hydrothermales profondes = Biology of deep-sea hydrothermal vents: Journées d'échanges du Programme DORSALES = DORSALES Workshop Roscoff 6-8 octobre 1997. Cahiers de Biologie Marine, 38(2): pp. 119
In: (1997). Biologie des sources hydrothermales profondes = Biology of deep-sea hydrothermal vents: Journées d'échanges du Programme DORSALES = DORSALES Workshop Roscoff 6-8 octobre 1997. Cahiers de Biologie Marine, 38(2)[s.n.][s.l.]. 111-149 pp., more
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723; e-ISSN 2262-3094, more
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| Authors | | Top |
- Claudinot, S.
- Andersen, A.C.
- Jouin-Toulmond, C.
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| Abstract |
The plume of the Vestimentiferan tubeworm Riftia Pachyptila gets its red color from the haemoglobin circulating both in the blood vessels, and in the coelomic cavity of the branchial filaments. The numerous bronchial filaments of the plume, comprise an epidermal ciliated and glandular cell layer, surrounding a coelomic myo-epithelial layer which borders the central coelomic cavity. Two blood vessels are bathed in this coelomic cavity which is also filled with an extracel]ular haemoglobin. Three different extracellular haemoglobins have been characterized in Riftia (Zal et al 1996): one coelomic haemoglobin (C1= 400 KDa) and two vascular haemoglobins (V1= 3400 KDa and V2= 400 KDa). In the coelomic layer, the contractile myofilaments are located in the basal part of the myo-epithelium, while the apical cell bodies extend into the coelomic cavity. Electron micrographs showed that these cell bodies contain numerous mitochondria and a nucleus surrounded by a well developed rough endoplamic reticulum (RER). The swollen RER cisterns are filled with a moderately electron-dense substance which appears similar to haemoglobin. The RER cisterns could release this substance, by exocytosis, into the coelomic cavity. These observations suggest that the myo-epithelial cells of the plume could be a haematopoietic site for the coe]offlic haemoglobin. Examination of other parts of the coelomic myoepitheliurn along the body cavity and further analyses using other methods are presently under investigation. |
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