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Further studies on a renotropic system in rats
The Yale Journal of Biology and Medicine
|May 1, 1978
Summary
Circulating substances in blood stimulate kidney growth after surgery. These factors, found in sera and plasma, promote DNA and RNA synthesis in kidney cells, suggesting a role in compensatory renal growth.
Area of Science:
- Physiology
- Molecular Biology
Background:
- Compensatory renal growth is a complex process.
- The existence of specific circulating factors regulating this growth has been hypothesized.
Purpose of the Study:
- To investigate the role of circulating substances in compensatory renal growth.
- To identify factors in sera and plasma that stimulate kidney cell growth.
Main Methods:
- Comparing sera and plasma from unilaterally nephrectomized rats versus sham-operated rats.
- Measuring the incorporation of radiolabeled nucleotides (thymidine and uridine) into DNA and RNA of kidney fragments.
- Analyzing the effects of kidney extracts combined with sera.
Main Results:
- Sera and plasma from nephrectomized rats significantly stimulated DNA and RNA synthesis in kidney fragments.
- Kidney extracts enhanced isotope incorporation when combined with sera, suggesting a synergistic effect.
- Sera did not stimulate DNA synthesis in liver slices, but kidney extracts did, indicating specificity.
Conclusions:
- Circulating factors in sera and plasma play a significant role in regulating compensatory renal growth.
- These renotropic factors likely act directly on kidney cells to promote DNA and RNA synthesis.
- The findings support the hypothesis of specific circulating substances inciting and regulating compensatory renal growth.