J Neurochem 1992 Mar 01;583:1165-7. doi: 10.1111/j.1471-4159.1992.tb09376.x.

Expression of size-selected RNA encoding brain serotonin transporter in Xenopus laevis oocytes.

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The mRNA that encodes a serotonin transporter was expressed using the Xenopus laevis oocyte expression system. Poly(A)+ RNA isolated from mouse brainstem was injected into Xenopus laevis oocytes, and the ability of oocytes to take up serotonin was measured 3 days postinjection. RNA-dependent serotonin uptake was sensitive to citalopram, a specific inhibitor of serotonin uptake, whereas background levels of serotonin uptake were not citalopram sensitive. Two RNA size fractions, 4.0 and 4.5 kb, were most efficient in stimulating uptake. Injection into Xenopus laevis oocytes of the 4.5-kb size fraction of mouse brainstem RNA resulted in threefold more serotonin uptake than did injection of unfractionated poly(A)+ RNA.

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