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The supraoptic nucleus: a morphological and quantitative study in control and hypophysectomised rats.
D Crespo1, J Ramos, C Gonzalez
1Department of Anatomy and Cell Biology, Faculty of Medicine, University of Cantabria, Santander, Spain.
Journal of Anatomy
|April 1, 1990
Summary
Hypophysectomy in rats causes a significant loss of neurons in the supraoptic nucleus. Remaining neurons adapt by altering RNA synthesis to compensate for the reduced neurosecretory neuron population.
Area of Science:
- Neuroscience
- Endocrinology
- Cell Biology
Background:
- The supraoptic nucleus (SON) plays a crucial role in neurohypophyseal hormone production.
- Understanding neuronal plasticity and survival in the SON is vital for comprehending hypothalamic function.
Purpose of the Study:
- To investigate the impact of hypophysectomy on neuronal number and morphology in the rat SON.
- To determine if there is postnatal loss of neurons in the pars principalis of the SON in normal rats.
Main Methods:
- Quantitative and morphometric analyses were performed on the pars principalis of the SON.
- Rats were divided into control and hypophysectomised groups at various postnatal ages.
- Neuronal counts and nuclear size were measured at Day 90.
Main Results:
- No significant postnatal loss of neurons was observed in the control group.
- Hypophysectomy resulted in a 74% loss of neurons in the SON by Day 90.
- A significant difference in nuclear size was noted between control and hypophysectomised groups.
Conclusions:
- Normal rats do not experience postnatal loss of neurons in the SON.
- Hypophysectomy induces adaptive changes in the remaining SON neurons, including alterations in RNA synthesis for hormone precursor production.