Effects of serotonin transporter promoter genotype on platelet serotonin transporter functionality in depressed children and adolescents

J Am Acad Child Adolesc Psychiatry. 1999 Nov;38(11):1396-402. doi: 10.1097/00004583-199911000-00014.

Abstract

Objective: To investigate possible associations between serotonin transporter (5-HTT) promoter genotypic variants (l/l, l/s, and s/s) and differential regulation of platelet 5-HTT functionality parameters in a group of drug-naive depressed children and adolescents and healthy controls.

Method: Children and adolescents with major depression (n = 18) defined by DSM-III-R criteria and normal controls (n = 21) were assessed both for platelet serotonin functionality and for genotypic variants on 5-HTT promoter region. Four parameters were considered: (1) serotonin uptake rate (Vmax); (2) serotonin dissociation constant (K(m)); (3) paroxetine binding and density of site (Bmax); and (4) paroxetine dissociation constant (Kd).

Results: Depressed children had lower Vmax and K(m). Control subjects with l/l genotype had significantly higher Vmax than control subjects with l/s and s/s genotype. Control subjects with l/l genotype also had significantly higher Vmax than their depressed homologs. In contrast, Vmax was not significantly different between depressed and nondepressed subjects who carried the other 2 genotypes. The 5-HTT promoter genotype, diagnoses, or their interaction had no effect on the other serotonin parameters.

Conclusions: While showing a significant decrease of Vmax and K(m) in a group of drug-naive depressed children and adolescents, these data suggest that l/l genotype has a substantial effect on the decrease of Vmax during a depressive episode.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Blood Platelets / physiology
  • Carrier Proteins / genetics*
  • Child
  • Depressive Disorder / genetics*
  • Depressive Disorder / physiopathology
  • Female
  • Genes, Regulator / genetics*
  • Genetic Predisposition to Disease
  • Genetic Variation
  • Humans
  • Male
  • Serotonin / pharmacokinetics*

Substances

  • Carrier Proteins
  • Serotonin