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MAP kinase in renal development
Midori Awazu1, Sayu Omori, Mariko Hida
1Department of Pediatrics, Keio University School of Medicine, Tokyo, Japan.
Background:
Among mitogen-activated protein kinase (MAPK) family members, ERK promotes proliferation or differentiation, whereas JNK and p38 are thought to inhibit cell growth and induce apoptosis. During renal development, large-scale proliferation and apoptosis occur. We investigated the temporal and spatial expression patterns of MAPK and its phosphatase MKP-1 as well as the role of ERK and p38 during kidney development.
Methods:
Western blot analysis and immunohistochemistry were performed in the developing and mature kidney of the rat. Rat metanephroi were cultured from 15-day-old embryos, and exposed to inhibitors of MEK, an activator of ERK, PD98059, U0126 or a p38 inhibitor, SB203580 24-120 h after the start of culture. Growth of metanephroi was measured by surface area and thymidine incorporation. Ureteric buds and glomeruli were identified by labelling with Dolichos biflorus lectin and peanut agglutinin, respectively.
Results:
The expression of ERK and p38 was high in the developing kidney. On the other hand, JNK was expressed abundantly in the adult kidney. Immunohistochemical studies revealed that the spatial expression of ERK coincided with the maturation of the kidney. p38 and MKP-1 were expressed uniformly. Growth of metanephroi was significantly inhibited by SB203580 but not by PD98059 or U0126. Ureteric bud branching was not affected by SB203580 or MEK inhibitors. Glomerular number was markedly reduced by SB203580 and to a lesser extent by U0126.
Conclusions:
ERK, p38 and MKP-1 are strongly expressed in the developing kidney, and JNK is detected predominantly in the adult kidney. ERK appears to play a role in nephrogenesis and p38 in kidney growth and nephrogenesis.
Insights
Mitogen-activated protein kinases (MAPKs) like ERK and p38 are crucial for kidney development. Inhibition of p38 significantly reduced kidney growth and glomerular formation, highlighting its role in nephrogenesis.
Area of Science:
- Developmental Biology
- Molecular Biology
- Renal Physiology
Background:
- Mitogen-activated protein kinases (MAPKs) regulate cell proliferation and apoptosis.
- ERK promotes cell growth, while JNK and p38 typically inhibit growth and induce apoptosis.
- Kidney development involves significant cell proliferation and apoptosis.
Purpose of the Study:
- Investigate the expression patterns of MAPKs (ERK, JNK, p38) and MKP-1 during kidney development.
- Determine the roles of ERK and p38 in kidney development using pharmacological inhibitors.
Main Methods:
- Western blot and immunohistochemistry analyzed MAPK and MKP-1 expression in developing and mature rat kidneys.
- Rat metanephroi were cultured and treated with MEK inhibitors (PD98059, U0126) or a p38 inhibitor (SB203580).
- Metanephroi growth was assessed by surface area and thymidine incorporation; ureteric bud branching and glomerular formation were quantified.
Main Results:
- ERK and p38 expression were high in developing kidneys, while JNK was prominent in adult kidneys.
- p38 inhibition (SB203580) significantly reduced metanephroi growth and glomerular number.
- MEK inhibitors (PD98059, U0126) did not affect growth, but U0126 slightly reduced glomerular number; ureteric bud branching was unaffected by inhibitors.
Conclusions:
- ERK, p38, and MKP-1 are highly expressed during kidney development, with JNK predominantly in adult kidneys.
- p38 plays a significant role in kidney growth and nephrogenesis.
- ERK may also be involved in nephrogenesis, though its role appears less critical than p38 based on these experiments.