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Updated: Jan 20, 2026

Estimation of Nephron Number in Whole Kidney using the Acid Maceration Method
Published on: May 22, 2019
ERK1,2 Signalling Pathway along the Nephron and Its Role in Acid-base and Electrolytes Balance
Giovanna Capolongo1, Yoko Suzumoto2, Mariavittoria D'Acierno2
1Department of Translational Medical Sciences, University of Campania "Luigi Vanvitelli", 80131 Naples, Italy.
Abstract:
Mitogen-activated protein kinases (MAPKs) are intracellular molecules regulating a wide range of cellular functions, including proliferation, differentiation, apoptosis, cytoskeleton remodeling and cytokine production. MAPK activity has been shown in normal kidney, and its over-activation has been demonstrated in several renal diseases. The extracellular signal-regulated protein kinases (ERK 1,2) signalling pathway is the first described MAPK signaling. Intensive investigations have demonstrated that it participates in the regulation of ureteric bud branching, a fundamental process in establishing final nephron number; in addition, it is also involved in the differentiation of the nephrogenic mesenchyme, indicating a key role in mammalian kidney embryonic development. In the present manuscript, we show that ERK1,2 signalling mediates several cellular functions also in mature kidney, describing its role along the nephron and demonstrating whether it contributes to the regulation of ion channels and transporters implicated in acid-base and electrolytes homeostasis.
Insights
Extracellular signal-regulated protein kinases (ERK 1,2) are crucial for kidney development and function. This study reveals ERK1,2 signaling
Area of Science:
- Molecular Biology
- Renal Physiology
- Cell Signaling
Background:
- Mitogen-activated protein kinases (MAPKs) regulate diverse cellular processes.
- MAPK activity is present in normal kidneys and dysregulated in renal diseases.
- Extracellular signal-regulated protein kinases (ERK 1,2) is a key MAPK pathway.
Purpose of the Study:
- To investigate the role of ERK1,2 signaling in mature kidney function.
- To elucidate the contribution of ERK1,2 to ion transport and homeostasis along the nephron.
Main Methods:
- Analysis of ERK1,2 signaling pathways in mature kidney tissues.
- Investigation of ERK1,2 involvement in nephron cellular functions.
- Assessment of ERK1,2 regulation of ion channels and transporters.
Main Results:
- ERK1,2 signaling mediates critical cellular functions in the mature kidney.
- The pathway plays a role in regulating ion channels and transporters.
- ERK1,2 signaling contributes to maintaining acid-base and electrolyte homeostasis.
Conclusions:
- ERK1,2 signaling is essential for both kidney development and mature kidney function.
- Understanding ERK1,2's role in ion transport is vital for renal homeostasis.
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