Related Experiment Videos
Insulin-like growth factor system gene expression in the human kidney
1Developmental Endocrinology Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892.
The Journal of Clinical Endocrinology and Metabolism
|September 1, 1992
Summary
The human kidney expresses Insulin-like growth factor-II (IGF-II), while the rat kidney expresses IGF-I. Both species share similar Insulin-like growth factor receptor (IGF-R) gene expression patterns in the kidney.
Area of Science:
- Nephrology
- Endocrinology
- Molecular Biology
Background:
- Insulin-like growth factors (IGFs) play crucial roles in renal development and function.
- Understanding the renal IGF system is vital for comprehending kidney physiology and pathophysiology.
- The rat kidney is a common model for studying IGFs, necessitating cross-species comparisons.
Purpose of the Study:
- To investigate the gene expression patterns of the renal IGF system in adult humans.
- To compare human renal IGF system gene expression with that of the adult rat kidney.
- To elucidate species-specific and conserved roles of IGFs in renal function.
Main Methods:
- In situ hybridization was employed to map gene expression.
- Examined expression of IGF-I, IGF-II, IGF binding proteins-1 and -2, and IGF receptors (types I and II).
- Compared gene expression patterns between adult human and rat kidneys.
Main Results:
- IGF-I mRNA was abundant in rat kidneys but undetected in human kidneys.
- IGF-II mRNA was abundant in human kidneys, particularly in the vasculature and interstitium, but undetected in adult rat kidneys.
- IGF binding protein-2 mRNA showed distinct localization patterns in human and rat kidneys, while IGF receptor gene expression patterns were conserved, with type I receptor mRNA being more abundant.
Conclusions:
- Autocrine/paracrine roles of IGFs differ significantly between rat and human kidneys.
- Conserved patterns of IGF receptor expression suggest similar roles for circulating IGFs in regulating renal function across species.
- Species-specific expression of IGF ligands highlights unique physiological adaptations in renal IGF systems.