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[Experimental polycythemia induced by lactate in Tritons]
Bollettino Della Societa Italiana Di Biologia Sperimentale
|April 15, 1982
Summary
Elevated plasma lactate levels, not oxygen deprivation, stimulate erythropoietin (ESF) production in newts. This leads to increased red blood cell counts, confirming lactate-sensitive cells
Area of Science:
- Comparative physiology
- Hematology
- Endocrinology
Background:
- Hypoxia is known to stimulate erythropoiesis (red blood cell production).
- Hypoxia also increases plasma lactate levels.
- The direct stimulus for erythropoietin (ESF) production remains debated.
Purpose of the Study:
- To investigate whether lactate or hypoxia directly stimulates erythropoietin (ESF) production in newts.
- To explore the role of lactate-sensitive cells in ESF regulation.
Main Methods:
- Newts (Triturus cristatus carnifex) were exposed to a sodium lactate solution (7 g/l) for 4 weeks.
- Red blood cell counts were compared to control newts in normally oxygenated water.
- Physiological responses to lactate and hypoxia were analyzed.
Main Results:
- Newts exposed to sodium lactate showed a 32% increase in red blood cell count compared to controls.
- Lactate administration alone increased erythrocyte numbers, similar to hypoxia.
- Hypoxia consistently elevated plasma lactate levels.
Conclusions:
- Increased plasma lactate, not reduced oxygen, is the primary stimulus for erythropoietin (ESF) production in newts.
- The findings indirectly support the hypothesis that renal corpuscle 'lactate-sensitive cells' produce ESF.
- This suggests a novel regulatory pathway for red blood cell production in amphibians.