Increases in CSF dopamine in HIV patients are due to the dopamine transporter 10/10-repeat allele which is more frequent in HIV-infected individuals.
Dysfunction of dopaminergic neurotransmission has been implicated in HIV infection. We showed previously increased dopamine (DA) levels in CSF of therapy-naïve HIV patients and an inverse correlation between CSF DA and CD4 counts in the periphery, suggesting adverse effects of high levels of DA on HIV infection. In the current study including a total of 167 HIV-positive and negative donors from Germany and South Africa (SA), we investigated the mechanistic background for the increase of CSF DA in HIV individuals. Interestingly, we found that the DAT 10/10-repeat allele is present more frequently within HIV individuals than in uninfected subjects. Logistic regression analysis adjusted for gender and ethnicity showed an odds ratio for HIV infection in DAT 10/10 allele carriers of 3.93 (95% CI 1.72-8.96; p = 0.001, Fishers exact test). 42.6% HIV-infected patients harbored the DAT 10/10 allele compared to only 10.5% uninfected DAT 10/10 carriers in SA (odds ratio 6.31), whereas 68.1 versus 40.9%, respectively, in Germany (odds ratio 3.08). Subjects homozygous for the 10-repeat allele had higher amounts of CSF DA and reduced DAT mRNA expression but similar disease severity compared with those carrying other DAT genotypes. These intriguing and novel findings show the mutual interaction between DA and HIV, suggesting caution in the interpretation of CNS DA alterations in HIV infection solely as a secondary phenomenon to the virus and open the door for larger studies investigating consequences of the DAT functional polymorphism on HIV epidemiology and progression of disease.
Institute of Virology and Immunobiology, University of Würzburg, Versbacher Str. 7, 97078, Würzburg, Germany.
Anne
A
Horn
Carsten
C
Scheller
Stefan
S
du Plessis
Gabriele
G
Arendt
Thorsten
T
Nolting
John
J
Joska
Sieghart
S
Sopper
Matthias
M
Maschke
Mark
M
Obermann
Ingo W
IW
Husstedt
Johannes
J
Hain
Tongai
T
Maponga
Peter
P
Riederer
Eleni
E
Koutsilieri
D015526:AIDS Dementia Complex / Q000134:cerebrospinal fluid / Q000235:genetics; D000328:Adult; D000368:Aged; D000483:Alleles; D004298:Dopamine / Q000134:cerebrospinal fluid*; D050483:Dopamine Plasma Membrane Transport Proteins / Q000235:genetics*; D005260:Female; D005838:Genotype; D015658:HIV Infections / Q000134:cerebrospinal fluid* / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D011110:Polymorphism, Genetic; D020133:Reverse Transcriptase Polymerase Chain Reaction; D055815:Young Adult
D050483:Dopamine Plasma Membrane Transport Proteins; D004298:Dopamine