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  • Title: Endogenous digoxin-like material in normotensive and hypertensive strains of rats.
    Author: Trachtman H, Delpizzo R, Chasalow FI.
    Journal: Life Sci; 1989; 44(24):1881-5. PubMed ID: 2739506.
    Abstract:
    We measured the concentration of endogenous digoxin-like materials (EDLM) in the serum of spontaneously hypertensive rats (SHR) and three normotensive rat strains at four stages during growth using a sensitive RIA. In the SHR, there was a significant peak in the EDLM level between 0.057-0.087 ngE/mL at 6 to 8 weeks of age, shortly after the onset of hypertension. The EDLM concentration returned to normal levels by 20 weeks of age. Sprague-Dawley and Wistar-Kyoto rats had EDLM levels below 0.050 ngE/mL at all time points studied. In contrast, Fischer 344 rats displayed persistently elevated serum EDLM concentrations that exceeded 0.124 ngE/mL from 3 to 20 weeks of life. We conclude that (1) there are significant interstrain differences in serum EDLM levels in rats; and (2) the SHR has a unique peak in serum EDLM levels at 6 to 8 weeks of age, indicating a possible role for the substance in the inception of hypertension.
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