Related Experiment Videos
In situ hybridization of prepro-epidermal growth factor mRNA in the mouse kidney
E C Salido1, P H Yen, L J Shapiro
1Department of Pathology, School of Medicine, University of California, Torrance.
Abstract:
The presence of prepro-epidermal growth factor (prepro-EGF) mRNA was studied in the mouse kidney by in situ hybridization using [3H]prepro-EGF cDNA and 35S-labeled prepro-EGF cRNA probes. In addition, anti-EGF serum was utilized to immunolocalize the peptide by the avidin-biotin complex immunoperoxidase method. Both EGF immunoreactivity and prepro-EGF mRNA hybridization were localized to the thick ascending limb of Henle (TAL) and the distal convoluted tubule (DCT), whereas the macula densa was negative. The glomerulus, the proximal portion of the nephron, and the collecting system were negative. Computer-assisted image analysis of the optical density of the autoradiographic and immunocytochemical signals were performed. The medullary TAL expressed significantly less prepro-EGF than the cortical TAL and the DCT.
Insights
Mouse kidney studies reveal epidermal growth factor (EGF) and its precursor mRNA are primarily located in the thick ascending limb of Henle and distal convoluted tubule. This localization was confirmed using advanced hybridization and immunolocalization techniques.
Area of Science:
- Nephrology
- Molecular Biology
- Histology
Background:
- Epidermal growth factor (EGF) plays a role in kidney development and repair.
- The precise localization of EGF synthesis within the kidney nephron is not fully understood.
- Investigating EGF expression can provide insights into renal physiology and pathology.
Purpose of the Study:
- To determine the specific location of prepro-epidermal growth factor (prepro-EGF) mRNA and EGF peptide within the mouse kidney.
- To quantify differences in prepro-EGF expression between different segments of the nephron.
Main Methods:
- In situ hybridization using [3H]prepro-EGF cDNA and 35S-labeled prepro-EGF cRNA probes to detect mRNA.
- Immunohistochemistry using anti-EGF serum and the avidin-biotin complex immunoperoxidase method to detect the peptide.
- Computer-assisted image analysis to quantify signal intensity.
Main Results:
- Both prepro-EGF mRNA and EGF immunoreactivity were detected in the thick ascending limb of Henle (TAL) and the distal convoluted tubule (DCT).
- The macula densa, glomerulus, proximal nephron segments, and collecting system showed negative results for both markers.
- Medullary TAL exhibited significantly lower prepro-EGF expression compared to cortical TAL and DCT.
Conclusions:
- The mouse kidney synthesizes prepro-EGF and EGF peptide predominantly in the TAL and DCT.
- Differential expression exists between cortical and medullary TAL, suggesting regional functional specialization.
- These findings enhance our understanding of EGF's role in specific nephron segments.