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Cochlear vascular changes in streptozotocin diabetes in chinchillas
Transactions. Section on Otolaryngology. American Academy of Ophthalmology and Otolaryngology
|March 1, 1977
Summary
Diabetic chinchillas showed reduced alkaline phosphatase activity and narrowed cochlear capillaries. Advanced diabetes led to capillary closure in the stria vascularis, impacting hearing blood supply.
Area of Science:
- Oto-vascular biology
- Diabetic microvascular complications
Background:
- Diabetes mellitus is associated with microvascular complications affecting various organs.
- The cochlear microcirculation is crucial for maintaining hearing function.
- Understanding diabetes-induced changes in the cochlea is vital for auditory health research.
Purpose of the Study:
- To investigate the effects of diabetes on cochlear blood vessels in a chinchilla model.
- To assess changes in alkaline phosphatase activity and capillary morphology over time in diabetic cochleae.
Main Methods:
- Diabetes was induced in chinchillas using streptozotocin injections.
- Cochlear microcirculation was examined using surface preparation techniques.
- Vascular changes were analyzed at 3, 6, and 12 months post-diabetes onset.
Main Results:
- A significant decrease in alkaline phosphatase activity was observed in cochlear capillary walls by six months.
- Generalized microcirculatory impairment was evident, characterized by reduced enzyme activity and irregular capillary lumens.
- Complete capillary closure occurred in the stria vascularis of the basal turn at 6 and 12 months.
Conclusions:
- Diabetes progressively damages cochlear microvasculature, affecting capillary integrity and function.
- Reduced alkaline phosphatase activity and capillary closure suggest impaired cochlear blood supply in diabetes.
- These findings highlight potential mechanisms for hearing loss in diabetic individuals.