Key result
Elevated plasma TSH precedes hypertension onset in spontaneously hypertensive and stroke-prone rat models.
Observational
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In an attempt to study whether TSH abnormality was genetically determined in SHR and SPR, plasma T4, T3, TSH and prolactin concentrations were measured in the animals with intervals of 1 to 3 months. Hypertension was found in 6-month-old SHR and SPR, but it was not found in younger animals. In contrast, a decrease of plasma T3 and an increase of plasma TSH were found in 15-day-old SHR. Also, an increase of TSH was found in 1-month-old SPR in spite of normal plasma T3 concentration. These abnormalities in SHR and SPR increased progressively with age. It is suggested that thyroid-pituitary abnormality was genetically determined in SHR and SPR.
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Kojima et al. (1975) conducted an observational in Spontaneous hypertension and stroke proneness (animal model). Genetic predisposition in spontaneously hypertensive rats (SHR) and stroke-prone rats (SPR) was evaluated on Plasma T4, T3, TSH, and prolactin concentrations. Spontaneously hypertensive and stroke-prone rats exhibited elevated plasma TSH by 15 days and 1 month of age, respectively, preceding hypertension onset at 6 months.
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