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Embryonic gene expression and pro-protein processing of proSAAS during rodent development
Daniel J Morgan1, Nino Mzhavia, Bonnie Peng
1Department of Neuroscience and Cell Biology, University of Medicine and Dentistry of New Jersey, Piscataway, New Jersey, USA.
Journal of Neurochemistry
|June 7, 2005
Summary
ProSAAS peptides inhibit prohormone convertase 1 (PC1). This study reveals widespread proSAAS expression in developing neurons and endocrine cells, suggesting multifunctional roles beyond PC1 inhibition during rodent development.
Area of Science:
- Neuroscience
- Developmental Biology
- Endocrinology
Background:
- ProSAAS is a precursor protein with peptides shown in vitro to inhibit prohormone convertase 1 (PC1).
- The in vivo function and developmental expression of proSAAS remain largely uncharacterized.
Purpose of the Study:
- To investigate the in vivo expression pattern of proSAAS mRNA during rodent development.
- To examine the processing of proSAAS and the presence of its functional fragments during prenatal and early postnatal stages.
Main Methods:
- In situ hybridization was used to map proSAAS mRNA expression in embryonic and early postnatal rat tissues.
- Analysis of proSAAS processing and accumulation of specific fragments was performed.
Main Results:
- ProSAAS mRNA is broadly expressed in differentiating neurons of the CNS and PNS by embryonic day 12.5.
- Expression extends to anterior and intermediate pituitary endocrine cells later in prenatal development.
- Processed forms of proSAAS, including the PC1 inhibitory fragment, accumulate by mid-gestation.
Conclusions:
- ProSAAS exhibits a widespread expression pattern in the developing nervous and endocrine systems, exceeding that of PC1.
- The extensive expression suggests multifunctional roles for proSAAS during development, potentially involving more than just PC1 inhibition.
- The presence of inhibitory fragments indicates a role in regulating neuroendocrine processing in vivo.