GHRP-6 · research summary

Ghrelin Amplifies the Nicotine-Induced Release of Dopamine in the Bed Nucleus of Stria Terminalis (BNST).

Biomedicines · 2023. Summary drawn from the study's full text. Each statement is followed by the exact sentence it comes from. This is a research summary, not medical advice.

Study type

In vitro superfusion study measuring dopamine release in rat brain slices
“Therefore, in the present study, nicotine and ghrelin were superfused to the BNST of male Wistar rats, and the dopamine release from the BNST was measured in vitro.”

Subjects

Male Wistar rats
“Male Wistar rats weighing 150–250 g (N = 6) were used for each in vitro experiment.”

Sample size

6 rats per experiment
“Male Wistar rats weighing 150–250 g (N = 6) were used for each in vitro experiment.”

Duration

Superfusion and stimulation protocol lasting approximately 64 minutes
“After 30 min of superfusion, the BNST slices were superfused for 32 min more, and during this time the fractions were collected in Eppendorf tubes by a multichannel fraction collector (Gilson FC 203B, Gilson, Middleton, WI, USA).”

Reported findings

Nicotine increased dopamine release in the BNST, an effect inhibited by mecamylamine
“Nicotine significantly increased the fractional [3H]DA release from rat BNST after electrical stimulation (F(3,31) = 19.78; p < 0.001), an effect that was inhibited significantly by mecamylamine (F(3,31) = 19.78; p < 0.001) (Figure 2).”
Ghrelin increased dopamine release in the BNST more significantly than nicotine, an effect inhibited by GHRP-6
“Ghrelin increased even more significantly the fractional [3H]DA release from rat BNST after electrical stimulation than nicotine did (F(3,31) = 16.58; p < 0.001), an effect that was inhibited significantly by GHRP-6 (F(3,31) = 16.58; p < 0.001) (Figure 3).”
Ghrelin amplified nicotine-induced dopamine release, an additive effect partly reversed by mecamylamine and GHRP-6
“Moreover, when administered together, ghrelin significantly amplified the nicotine-induced release of fractional [3H]DA release from rat BSNT after electrical stimulation (F(3,31) = 13.19; p < 0.001) (Figure 4), and this additive effect was partly reversed by mecamylamine (F(3,31) = 16.58; p < 0.001) and GHRP-6 (F(3,31) = 13.5; p < 0.05) (Figure 5).”

Limitations stated by the authors

The specific mechanism of interaction between ghrelin and nicotine remains unelucidated
“However, the intimate mechanism of how ghrelin interacts with nicotine remains to be elucidated.”

Source: PubMed 37760897 · DOI 10.3390/biomedicines11092456 · all study summaries

Duration

Superfusion and stimulation protocol lasting approximately 64 minutes

“After 30 min of superfusion, the BNST slices were superfused for 32 min more, and during this time the fractions were collected in Eppendorf tubes by a multichannel fraction collector (Gilson FC 203B, Gilson, Middleton, WI, USA).”

Reported findings

Nicotine increased dopamine release in the BNST, an effect inhibited by mecamylamine

“Nicotine significantly increased the fractional [3H]DA release from rat BNST after electrical stimulation (F(3,31) = 19.78; p < 0.001), an effect that was inhibited significantly by mecamylamine (F(3,31) = 19.78; p < 0.001) (Figure 2).”

Ghrelin increased dopamine release in the BNST more significantly than nicotine, an effect inhibited by GHRP-6

“Ghrelin increased even more significantly the fractional [3H]DA release from rat BNST after electrical stimulation than nicotine did (F(3,31) = 16.58; p < 0.001), an effect that was inhibited significantly by GHRP-6 (F(3,31) = 16.58; p < 0.001) (Figure 3).”

Ghrelin amplified nicotine-induced dopamine release, an additive effect partly reversed by mecamylamine and GHRP-6

“Moreover, when administered together, ghrelin significantly amplified the nicotine-induced release of fractional [3H]DA release from rat BSNT after electrical stimulation (F(3,31) = 13.19; p < 0.001) (Figure 4), and this additive effect was partly reversed by mecamylamine (F(3,31) = 16.58; p < 0.001) and GHRP-6 (F(3,31) = 13.5; p < 0.05) (Figure 5).”