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2018 ; 9
(ä): 676
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Tramadol s Inhibitory Effects on Sexual Behavior: Pharmacological Studies in
Serotonin Transporter Knockout Rats
#MMPMID29997507
Esquivel-Franco DC
; Olivier B
; Waldinger MD
; Gutiérrez-Ospina G
; Olivier JDA
Front Pharmacol
2018[]; 9
(ä): 676
PMID29997507
show ga
Tramadol is an effective pharmacological intervention in human premature
ejaculation (PE). To investigate whether the inhibitory action of tramadol is
primarily caused by its selective serotonin reuptake inhibitory (SSRI) effects we
tested the dose-response effects of tramadol on sexual behavior in serotonin
transporter wild type (SERT(+/+)), heterozygous (SERT(+/-)), and knockout
(SERT(-/-)) rats. To investigate whether other mechanisms contribute to the
inhibitory effects, WAY100,635, a 5-HT(1A) receptor antagonist and naloxone, a
?-opioid receptor antagonist, were tested on sexual behavior together with
tramadol. Tramadol dose-dependently decreases sexual activity in all genotypes.
In all studies, SERT(+/-) rats did not respond differently from SERT(+/+) rats.
WAY100,635 did not affect sexual activity in SERT(+/+), but dose-dependently
reduced sexual activity in SERT(-/-) rats. WAY100,635 (0.3 mg/kg) combined with
tramadol (20 mg/kg) significantly reduced sexual activity in SERT(+/+) and even
stronger in SERT(-/-) rats. Naloxone did not affect sexual behavior consistently
in SERT(+/+) rats, while in SERT(-/-) rats all doses reduced ejaculation
frequency mildly. Combining naloxone (20 mg/kg) and tramadol (20 mg/kg) decreased
ejaculation frequencies in both genotypes. Interestingly, combining tramadol (20
mg/kg), WAY100,635 (0.3 mg/kg) and naloxone (20 mg/kg) led to complete
elimination of all sexual activity in both SERT(+/+) and SERT(-/-) rats. These
findings suggest that the inhibitory effects of tramadol on male sexual behavior
in SERT(+/+) rats is mainly, if not exclusively, due to SERT inhibition, with an
important role for 5-HT(1A) receptors, although influence of other systems (e.g.,
noradrenergic) cannot be excluded. As SSRIs exert their sexual inhibition after
chronic administration, tramadol may be therapeutically attractive as "on demand"
therapy for PE.