Ramanjit Sihota1, Seema Sen2, Sujata Mohanty3, Mohammad Ahmad2, Alok Ravi4, Viney Gupta4, Neerja Bhatla5. 1. Glaucoma Research Facility and Clinical Services, Dr Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, 110029, India. rjsihota@hotmail.com. 2. Ocular Pathology, All India Institute of Medical Sciences, New Delhi, 110029, India. 3. Stem Cell Facility, All India Institute of Medical Sciences, New Delhi, 110029, India. 4. Glaucoma Research Facility and Clinical Services, Dr Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, 110029, India. 5. Obstetrics and Gynaecology, All India Institute of Medical Sciences, New Delhi, 110029, India.
Abstract
BACKGROUND: This study aimed to investigate the effect of intracameral human cord blood stem cells on lasered rabbit trabecular meshwork. METHODS: Immediately following diode laser application to the trabecular meshwork, human cord blood stem cells were injected intracamerally, in one eye of 12 albino rabbits. The other eye of ten rabbits was lasered controls and two eyes were normal controls. Rabbits were killed after 4, 8 and 12 weeks. RESULTS: Lasered control rabbit eyes showed significant disruption of trabecular architecture, loss and pleomorphism of trabecular endothelial cells and progressive narrowing of trabecular spaces till 12 weeks. In contrast, lasered eyes, concurrently injected with human cord blood stem cells, showed relatively preserved endothelial cellularity and structure of the trabecular meshwork, at all time points. Human CD34- and CD44-positive cells were identified in 7/8 eyes treated with stem cells, at 4 and 8 weeks, and 2 of 3 at 12 weeks. Many PKH26-labeled human cord blood cells were visible throughout the trabecular area at 4 weeks. They gradually decreased in number by 8 weeks, and at 12 weeks, they appeared to be oriented along trabecular beams. CONCLUSIONS: There was a relative preservation of cellularity and architecture of the trabecular meshwork in eyes injected with human cord blood stem cells, as compared to lasered control eyes up to 12 weeks, without significant inflammation. This suggests a probable role for such stem cells in eyes with glaucoma, having trabecular dysfunction.
BACKGROUND: This study aimed to investigate the effect of intracameral human cord blood stem cells on lasered rabbit trabecular meshwork. METHODS: Immediately following diode laser application to the trabecular meshwork, human cord blood stem cells were injected intracamerally, in one eye of 12 albino rabbits. The other eye of ten rabbits was lasered controls and two eyes were normal controls. Rabbits were killed after 4, 8 and 12 weeks. RESULTS: Lasered control rabbit eyes showed significant disruption of trabecular architecture, loss and pleomorphism of trabecular endothelial cells and progressive narrowing of trabecular spaces till 12 weeks. In contrast, lasered eyes, concurrently injected with human cord blood stem cells, showed relatively preserved endothelial cellularity and structure of the trabecular meshwork, at all time points. HumanCD34- and CD44-positive cells were identified in 7/8 eyes treated with stem cells, at 4 and 8 weeks, and 2 of 3 at 12 weeks. Many PKH26-labeled human cord blood cells were visible throughout the trabecular area at 4 weeks. They gradually decreased in number by 8 weeks, and at 12 weeks, they appeared to be oriented along trabecular beams. CONCLUSIONS: There was a relative preservation of cellularity and architecture of the trabecular meshwork in eyes injected with human cord blood stem cells, as compared to lasered control eyes up to 12 weeks, without significant inflammation. This suggests a probable role for such stem cells in eyes with glaucoma, having trabecular dysfunction.
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