Abstract
By the breeding selection for the extreme values of platelet serotonin transporter activity, two sublines of Wistar-derived rats, with constitutionally high or low platelet serotonin uptake (PSU), were previously developed. In order to study the genetic background of these inherited differences, comparative Northern blot analysis of the platelet serotonin transporter messenger RNA levels of the animals from the two sublines was performed. If the values of animals from the high-PSU subline are taken as 100%, animals from the low-PSU subline demonstrated lower values of both platelet serotonin uptake and transporter mRNA levels (amounting to 62 and 76% respectively). Correlation between platelet serotonin uptake and the respective levels of messenger RNA for the serotonin transporter ( r = 0.829, P < 0.01, N = 8) points to the same direction, indicating that the process of breeding selection for the extreme values of transporter kinetics has influenced transcription mechanisms of the serotonin transporter gene.
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