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Updated: Jul 13, 2026

Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death
Published on: December 27, 2016
Nodal signalling and apoptosis
Hongmei Wang1, Benjamin K Tsang
1State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China. wanghm@ioz.ac.cn
Abstract:
Nodal, a member of the transforming growth factor beta family, was first cloned from a 7.5 day post-coitum mouse embryo cDNA library. Nodal exerts its biological effects by signalling through its types I and II serine/threonine kinase receptor complex and intracellular Smad proteins. The type II receptors for Nodal are Activin type II receptors ActRIIA and ActRIIB, whereas the putative type I receptors are Activin receptor like kinase (ALK) 4 and ALK7. The main Smad proteins involved in Nodal signalling are Smad2 and Smad3. Studies of Nodal in adult tissues indicate that it is pro-apoptotic in rat ovarian granulosa cells, human trophoblast cells and human ovarian epithelial cancer cells and is growth inhibitory in the latter two cell types. This review summarises the progress made on the functions of Nodal in the apoptosis of adult tissues, especially in the ovary and placenta.
Insights
Nodal, a transforming growth factor beta family member, plays a role in apoptosis and growth inhibition in adult tissues. This review focuses on Nodal
Area of Science:
- Molecular Biology
- Developmental Biology
- Cell Biology
Background:
- Nodal is a key member of the transforming growth factor beta superfamily.
- It signals through a receptor complex involving ActRIIA/ActRIIB and ALK4/ALK7.
- Smad2 and Smad3 are crucial intracellular mediators of Nodal signaling.
Purpose of the Study:
- To review the functions of Nodal in adult tissue apoptosis.
- To highlight Nodal's specific roles in the ovary and placenta.
Main Methods:
- Literature review of studies on Nodal function in adult tissues.
- Analysis of Nodal's pro-apoptotic and growth-inhibitory effects.
Main Results:
- Nodal demonstrates pro-apoptotic activity in rat ovarian granulosa cells, human trophoblast cells, and human ovarian epithelial cancer cells.
- Nodal exhibits growth inhibitory effects in human trophoblast and ovarian epithelial cancer cells.
Conclusions:
- Nodal influences apoptosis and growth regulation in various adult tissues.
- Further research into Nodal's functions in the ovary and placenta is warranted.
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