Related Experiment Videos
The seasonal breeding hamster as a model to study structure-function relationships in the testis
A P Hikim1, A J Bartke, L D Russell
1Department of Physiology, School of Medicine, Southern Illinois University, Carbondale 62901-6512.
Tissue & Cell
|January 1, 1988
Summary
Short photoperiods cause significant testicular regression in golden hamsters, drastically reducing testis weight and altering germ, Sertoli, and Leydig cell morphology. This highlights the hamster as a model for studying photoperiod-induced testicular structure-function relationships.
Area of Science:
- Reproductive Biology
- Endocrinology
- Cell Biology
Background:
- Golden hamsters are established models for endocrine studies.
- Inadequate morphological data exists for their seasonally regressed testes.
- Photoperiod influences gonadal activity.
Purpose of the Study:
- To document testicular morphological changes in golden hamsters under different photoperiods.
- To correlate these changes with gonadal activity states (active vs. regressed).
- To evaluate the golden hamster as a model for structure-function studies of the testis.
Main Methods:
- Animals exposed to long (16L:8D) and short (6L:18D) photoperiods to induce active and regressed gonadal states, respectively.
- Morphological examination of germ cells, Sertoli cells, and Leydig cells within the testes.
- Quantitative assessment of testis weight and seminiferous tubule diameter.
Main Results:
- Short photoperiods caused a >10-fold reduction in testis weight and decreased seminiferous tubule diameter.
- Regressed testes showed reduced Leydig cell size and altered endoplasmic reticulum structure.
- Sertoli cells exhibited reduced height, volume, lipid accumulation, and decreased smooth endoplasmic reticulum and glycogen.
Conclusions:
- Photoperiod manipulation induces striking morphological differences in golden hamster testes, mirroring endocrine changes.
- The observed structural alterations provide a basis for understanding seasonal testicular regression.
- Golden hamsters are well-suited for investigating testis structure-function relationships, particularly concerning Sertoli cell dynamics.