Human iPSC-Derived Neurons as A Platform for Deciphering the Mechanisms behind Brain Aging

Area of Science:

• Neuroscience
• Cell Biology
• Genetics

Background:

• Human life expectancy is increasing, making aging a critical area for biomedical research.
• Studying brain aging and neurodegenerative diseases is challenging due to limited access to human brain tissue and a lack of suitable in vitro models.
• Understanding cellular and molecular changes in senescent neurons is crucial for advancing research in age-associated neurological disorders.

Purpose of the Study:

• To review age-related molecular and epigenetic changes in senescent neurons.
• To explore and compare current in vitro models for studying neuronal aging, including immortalized cell lines, primary neuronal cultures, fibroblast-converted neurons (Fib-iNs), and induced pluripotent stem cell-derived neurons (iPSC-iNs).
• To discuss the potential of combining human iPSC-iNs with genome editing for future research on brain aging and neurodegenerative diseases.

Main Methods:

• Literature review of age-related changes in neuronal transcriptome, signaling pathways, and epigenetics.
• Analysis and comparison of existing in vitro neuronal aging models (immortalized cell lines, primary cultures, Fib-iNs, iPSC-iNs).
• Discussion of key senescence phenotypes observed in these models.

Main Results:

• Senescent neurons exhibit age-related alterations in their transcriptome, signaling pathways, and epigenetic factors.
• Various in vitro models have distinct advantages and limitations for studying neuronal aging.
• Human iPSC-derived neurons (iPSC-iNs) show promise, especially when combined with genome editing technologies.

Conclusions:

• In vitro models are essential for understanding neuronal aging and age-related diseases.
• Human iPSC-iNs combined with genome editing offer a powerful future direction for studying brain aging and neurodegenerative diseases.
• Further research and technological advancements are needed to overcome current challenges in the field.