Generation of Functional Immortalized Human Corneal Stromal Stem Cells

Area of Science:

• Ophthalmology
• Stem Cell Biology
• Regenerative Medicine

Background:

• Primary human corneal stromal stem cells (CSSCs) show therapeutic potential but face limitations due to donor variability and short lifespan.
• These limitations hinder their use in drug discovery and regenerative medicine applications.
• Developing stable, long-term CSSC lines is crucial for advancing these fields.

Purpose of the Study:

• To establish and characterize immortalized CSSC (imCSSC) lines from primary human CSSCs.
• To overcome the limited lifespan and donor variability of primary CSSCs.
• To create a scalable source of CSSCs for research and therapeutic development.

Main Methods:

• Primary CSSCs (pCSSC) were isolated from human adult corneoscleral tissue.
• Cells were transduced with genetic material (hTERT, c-MYC, or SV40T) to induce immortalization.
• Evaluated cell morphology, proliferation, surface marker expression, and TNFAIP6 gene expression.

Main Results:

• SV40T-overexpressing imCSSC lines demonstrated extended lifespan compared to pCSSC.
• Immortalized cells maintained similar morphology, proliferation capacity, and differentiation potential.
• Anti-inflammatory properties, indicated by TNFAIP6 expression, were preserved.

Conclusions:

• Immortalization of CSSCs is feasible and can overcome limitations of primary cells.
• SV40T-mediated immortalization yields stable imCSSC lines with retained therapeutic characteristics.
• This approach provides a proof-of-concept for generating a large-scale source of CSSCs for regenerative medicine and drug discovery.