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Follistatin-like 1 in vertebrate development
M Sylva1, A F M Moorman, M J B van den Hoff
1Academic Medical Center, Department of Anatomy, Embryology and Physiology, Meibergdreef 15 1105 AZ, Amsterdam, The Netherlands.
Abstract:
Follistatin-like 1 (Fstl1) is a member of the secreted protein acidic rich in cysteins (SPARC) family and has been implicated in many different signaling pathways, including bone morphogenetic protein (BMP) signaling. In many different developmental processes like, dorso-ventral axis establishment, skeletal, lung and ureter development, loss of function experiments have unveiled an important role for Fstl1. Fstl1 largely functions through inhibiting interactions with the BMP signaling pathway, although, in various disease models, different signaling pathways, like activation of pAKT, pAMPK, Na/K-ATPase, or innate immune responses, are linked to Fstl1. How Fstl1 inhibits BMP signaling remains unclear, although it is known that Fstl1 does not function through a scavenging mechanism, like the other known extracellular BMP inhibitors such as noggin. It has been proposed that Fstl1 interferes with BMP receptor complex formation and as such inhibits propagation of the BMP signal into the cell. Future challenges will encompass the identification of the factors that determine the mechanisms that underlie the fact that Fstl1 acts by interfering with BMP signaling during development, but through other signaling pathways during disease.
Insights
Follistatin-like 1 (Fstl1) is crucial in development by inhibiting bone morphogenetic protein (BMP) signaling. Its precise inhibitory mechanism and distinct roles in disease warrant further investigation.
Area of Science:
- Biochemistry
- Developmental Biology
- Molecular Signaling
Background:
- Follistatin-like 1 (Fstl1) is a secreted protein in the SPARC family.
- Fstl1 plays vital roles in embryonic development, including axis formation and organogenesis.
- It is known to interact with bone morphogenetic protein (BMP) signaling pathways.
Purpose of the Study:
- To elucidate the mechanisms by which Fstl1 regulates BMP signaling.
- To differentiate Fstl1's roles in development versus disease states.
- To identify factors governing Fstl1's distinct signaling pathway engagement.
Main Methods:
- Review of existing literature on Fstl1 function.
- Analysis of loss-of-function studies in developmental processes.
- Examination of signaling pathways implicated in Fstl1-related disease models.
Main Results:
- Fstl1 is essential for developmental processes like skeletal and lung development.
- Fstl1 inhibits BMP signaling, but not via a scavenging mechanism.
- In disease, Fstl1 is linked to pathways such as pAKT, pAMPK, and innate immunity.
Conclusions:
- Fstl1's developmental role involves interfering with BMP receptor complex formation.
- Fstl1 utilizes different signaling pathways in disease contexts compared to development.
- Further research is needed to understand the regulatory factors controlling Fstl1's context-dependent mechanisms.
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