Key result
Chronic local cold stimulation of the soles of the paws induced significantly higher blood pressure, proteinuria, and catecholamine levels compared to controls in pregnant and nonpregnant rats.
Why the study?
Does cold-stress stimulation of the soles of the paws produce a preeclampsia-like syndrome in pregnant or nonpregnant rats?
Does cold-stress stimulation of the soles of the paws produce a preeclampsia-like syndrome in pregnant or nonpregnant rats?
Chronic local cold stimulation in rats induces a preeclampsia-like syndrome, suggesting a role for chronic sympathetic nerve stimulation in the pathogenesis of preeclampsia.
Does not support clinical changes in preeclampsia; leaves open sympathetic stimulation as a pathogenic factor requiring human studies.
OBJECTIVE: To determine whether cold-stress stimulation of the soles of the paws would produce a preeclampsia-like syndrome in rats. METHODS: Pregnant or nonpregnant rats were kept in 0 degree C floor and 23 degrees C room temperature cages (the cold-stressed group) or in 23 degrees C floor and 23 degrees C room temperature cages (the control group) for 2 weeks. Their blood pressure, proteinuria, and plasma catecholamines were measured, and histologic studies were performed on all groups. RESULTS: There were no significant differences in systolic blood pressure between the two groups during the first week of the experimental period; however, during the last week of gestation the blood pressure of the cold-stressed group did not fall and was significantly higher than that of the control group. A significant increase in urinary protein excretion was observed in the cold-stimulated pregnant rats, in contrast to the control rats. The concentrations of norepinephrine and epinephrine in the cold-stressed pregnant rats were markedly higher than those in the control rats. A decrease in trophoblast invasion, congestion, and fibrinoid deposits of the labyrinth were observed in the cold-stressed rats. A marked increase in subendothelial fibrinoid deposits in the glomerular capillary was found only in the cold-stressed pregnant rats. The blood pressure, biochemical parameters, and histologic findings in the nonpregnant rats were almost the same as those in the pregnant rats. CONCLUSION: Chronic local cold stimulation of the soles of the paws induces preeclampsia-like phenomena in pregnant and nonpregnant rats, and this model suggests that the cause of preeclampsia is involved in chronic stimulation of the sympathetic nerve.
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Kanayama et al. (1997) studied Preeclampsia-like syndrome. Cold-stress stimulation (0 degree C floor) vs. 23 degrees C floor (control) was evaluated on Blood pressure, proteinuria, and plasma catecholamines. Chronic local cold stimulation of the soles of the paws induced significantly higher blood pressure, proteinuria, and catecholamine levels compared to controls in pregnant and nonpregnant rats.
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