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Expression of epidermal growth factor in the developing rat kidney
Ju-Young Jung1, Ji-Hyun Song, Can Li
1Department of Anatomy, College of Medicine, Hallym University, Chuncheon, Korea.
American Journal of Physiology. Renal Physiology
|September 9, 2004
Summary
Epidermal growth factor (EGF) expression in developing rat kidneys appears at postnatal day 3, primarily in the thick ascending limb (TAL). This suggests EGF regulates kidney development, potentially acting locally.
Area of Science:
- Developmental Biology
- Nephrology
- Cell Biology
Background:
- Epidermal growth factor (EGF) is crucial for mammalian kidney development.
- Understanding EGF's precise role and localization during renal morphogenesis is essential.
Purpose of the Study:
- To investigate the detailed distribution and temporal appearance of EGF in the developing rat kidney.
- To elucidate the role of EGF in the growth and differentiation of the loop of Henle.
Main Methods:
- Immunohistochemistry and electron microscopy were used to analyze kidney tissues.
- Kidneys were collected from embryonic day 18 to postnatal day 21, and adult rats.
Main Results:
- EGF immunoreactivity was first detected at postnatal day 3 in the differentiating thick ascending limb (TAL) of the corticomedullary junction.
- By postnatal day 7, EGF expression significantly increased in the medullary TAL.
- Between postnatal days 14 and 21, EGF was found in the TAL and distal convoluted tubule (DCT); smooth-surfaced cells showed strong EGF immunoreactivity, unlike rough-surfaced cells.
Conclusions:
- EGF expression in the developing kidney is critical for regulating the growth and differentiation of the loop of Henle.
- EGF likely acts in a paracrine manner to influence kidney development.