Comparative analysis of thyroxine distribution in ascidian larvae

We have studied the presence and localization of l-thyroxine in Ascidia malaca, Ascidiella aspersa, Phallusia mamillata and Ciona intestinalis larvae and its involvement in metamorphosis

Paolo D’Agati; Matteo Cammarata

2005

Scholarcy highlights

  • The ascidian endostyle is a mucus-secreting pharyngeal organ, it has iodine-concentrating activity and the biosynthesis of thyroid hormones has been well documented
  • According to our recent findings, ascidians possess thyroid hormones, which are localized in mesenchymal cells
  • We have studied the presence and localization of l-thyroxine in Ascidia malaca, Ascidiella aspersa, Phallusia mamillata and Ciona intestinalis larvae and its involvement in metamorphosis
  • The hormone was localized in mesenchymal cells of all four ascidians, spread out in the body cavity, under the adhesive papillae and around the intestine
  • The presence of TH in mesenchymal cells could be related to blood cells, musculature and heart tissue differentiation
  • The results suggest that this hormone could be involved in the control of metamorphosis

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