Nestin reporter transgene labels multiple central nervous system precursor cells

Area of Science:

• Neuroscience
• Developmental Biology
• Stem Cell Biology

Background:

• Nestin is a key marker for neural stem and progenitor cells in both embryonic and adult brains.
• Understanding the lineage and dynamics of these cells is crucial for neurodevelopmental and regenerative studies.

Purpose of the Study:

• To characterize a novel transgenic mouse line using enhanced green fluorescent protein (eGFP) under the control of the nestin promoter.
• To evaluate the utility of this eGFP reporter line for studying neural stem and progenitor cell populations and their behavior in various physiological and pathological conditions.

Main Methods:

• Generation and characterization of a transgenic mouse line with eGFP expression driven by the nestin promoter's second intronic enhancer.
• Analysis of eGFP expression patterns in different brain regions during embryogenesis, postnatal development, and in adult neurogenic niches.
• Assessment of eGFP+ cell phenotypes using lineage markers and evaluation of their response to cortical injury.
• Examination of eGFP expression in non-neurogenic regions, specifically focusing on glial cells.

Main Results:

• The transgenic line exhibited distinct eGFP expression patterns, with numerous cells in the dorsal telencephalon during embryogenesis and enrichment in postnatal and adult neurogenic regions like the subventricular zone (SVZ).
• eGFP+ cells in the SVZ expressed markers consistent with neural progenitor cells and neuroblasts, indicating transgene expression throughout the neural lineage.
• Increased eGFP+ cell numbers were observed in the SVZ following cortical injury, suggesting suitability for studying post-injury neurogenesis.
• In non-neurogenic areas, eGFP was specifically detected in oligodendrocyte progenitors but not in astrocytes, even reactive ones.

Conclusions:

• The characterized nestin-eGFP transgenic mouse line serves as a valuable tool for tracking neural stem and progenitor cells.
• This model facilitates in-depth studies of both embryonic and adult neurogenesis, as well as the development and behavior of parenchymal oligodendrocytes.
• The reporter line's responsiveness to injury highlights its potential for investigating regenerative processes in the central nervous system.