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Related Concept Videos

Unrenewable Cells00:50

Unrenewable Cells

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In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of...
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Updated: Mar 24, 2026

Author Spotlight: Advancing Vision Restoration - Stem Cell-Based Therapy for Retinal Diseases
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Lens regeneration using endogenous stem cells with gain of visual function.

Haotian Lin1, Hong Ouyang1, Jie Zhu2

  • 1State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou 510060, China.

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|March 10, 2016
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Researchers achieved functional lens regeneration in mammals and human infants by preserving natural lens stem cells. This breakthrough offers a new treatment for cataracts and a paradigm for tissue regeneration.

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Area of Science:

  • Regenerative Medicine
  • Ophthalmology
  • Stem Cell Biology

Background:

  • Cataracts are the leading cause of blindness globally, treated by lens extraction and artificial implants, which carry risks.
  • Human lens regeneration has not been previously demonstrated.
  • Endogenous stem cell-based tissue repair is a key goal in regenerative medicine.

Purpose of the Study:

  • To demonstrate functional human lens regeneration.
  • To identify key factors for lens epithelial stem/progenitor cell (LECs) renewal.
  • To develop a novel surgical approach for cataract treatment preserving endogenous LECs.

Main Methods:

  • Isolated mammalian lens epithelial stem/progenitor cells (LECs).
  • Identified Pax6 and Bmi1 as crucial for LEC renewal.
  • Developed a minimally invasive surgical technique for cataract removal preserving LECs.

Main Results:

  • Demonstrated functional lens regeneration in rabbits, macaques, and human infants with cataracts.
  • Confirmed the requirement of Pax6 and Bmi1 for LEC renewal.
  • The novel surgical method maximally preserved LECs and their environment, leading to regenerated lenses with visual function.

Conclusions:

  • A novel surgical strategy for cataract treatment has been developed, achieving functional lens regeneration.
  • This approach preserves endogenous LECs and their natural environment, offering a significant advantage over current methods.
  • The study presents a new paradigm for tissue regeneration utilizing endogenous stem cells.