Lab-grown mini lenses offer a closer look at how cataracts develop.
Researchers described a lab method that turns human induced pluripotent stem cells into lens-like structures called lentoids, offering a human model for studying how the lens forms and how cataracts might arise.
Researchers have reported a laboratory platform that grows human lens-like structures from induced pluripotent stem cells. The authors write that animal models have helped explain lens development, but direct models of how the human lens forms remain limited. The new structures, called lentoids, are meant to help fill that gap.
The platform combines two elements. The first is a patterned differentiation method known as SEAM (self-formed ectodermal autonomous multizone), applied to human induced pluripotent stem cells. The second is a lens optimised medium, or LOM. According to the paper, the lentoids showed zone-specific organization, higher expression of lens crystallins and connexins, and protein localization that reflected both lens epithelial cells and lens fiber cells.
Cultures treated with LOM showed stronger expression of γ-crystallin, cadherin-mediated organization, and deposition of a capsule basement membrane. At the ultrastructural level, the authors observed features of a maturing lens. These included elongated fibers resembling those of the lens cortex, layered epithelium, and junctions between cells with ball-and-socket-like interdigitations.
The team also identified populations of epithelial-like cells with self-renewing properties. These cells carried the markers PAX6, SIX3 and SOX2, and the authors describe them as preplacodal and presumptive lens ectodermal. They went on to form secondary lentoids after activation of PROX1 and SOX1, transcription factors involved in lens crystallin differentiation. The authors say this points to a form of epithelial plasticity.
The authors present the system as a platform for studying ectodermal pathways, regenerative biology and cataractogenesis, the process by which cataracts develop. They note that lens cells must produce large amounts of structural proteins meant to last a lifetime and rely on a strong protein quality control system. In their view, stem cell-derived models give researchers a human system for examining the limits of cellular differentiation and protein homeostasis.
Note: The headline says the lenses offer a closer look at how cataracts develop. The page presents the model as a platform for studying cataract formation and does not report cataract-specific findings.
At a Glance
- The lentoids were grown from human induced pluripotent stem cells using SEAM differentiation plus a lens optimised medium (LOM).
- LOM-treated cultures showed stronger γ-crystallin expression and capsule basement membrane deposition.
- Epithelial-like PAX6, SIX3 and SOX2 positive cells formed secondary lentoids after PROX1 and SOX1 were activated.
- The lentoids showed zone-specific organization and higher expression of lens crystallins and connexins.
Sources
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