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Ultrastructural changes in thyroid perifollicular capillaries during normal postnatal development and after infrared
L Vidal1, M Ortíz, I Pérez de Vargas
1Department of Normal and Pathological Morphology, Faculty of Medicine, University of Málaga, Málaga, Spain. lvidal@uma.es
Lasers in Medical Science
|August 16, 2002
Summary
Postnatal thyroid capillary development involves growth and maturation. Infrared laser irradiation impacts this development, potentially altering thyroid function in Wistar rats.
Area of Science:
- Endocrinology
- Vascular Biology
- Developmental Biology
Background:
- Thyroid gland development is crucial for hormone regulation.
- Postnatal capillary maturation is essential for tissue function.
- The effects of infrared laser on developing vasculature are not fully understood.
Purpose of the Study:
- To investigate the morphological changes in perifollicular thyroid capillaries during postnatal development.
- To assess the impact of infrared laser irradiation on these developing capillaries.
Main Methods:
- Quantitative analysis of capillary morphology.
- Electron microscopy of thyroid perifollicular capillaries.
- Study conducted on Wistar rats at 11, 21, and 35 days postnatally.
Main Results:
- Normal postnatal development shows increased capillary size, thinned endothelium, and larger pinocytotic vesicles.
- Infrared laser irradiation stimulated endothelial growth in younger rats.
- In older rats, infrared laser caused irregular endothelium thickening and reduced capillary lumen.
Conclusions:
- Thyroid capillaries undergo maturation for optimal function during postnatal development.
- Infrared laser irradiation has differential effects on capillary development based on age.
- Observed vascular changes suggest potential functional alterations in thyroid follicular cells post-irradiation.