• 제목/요약/키워드: Neurobiology

검색결과 233건 처리시간 0.026초

The GABAB receptor associates with regulators of G-protein signaling 4 protein in the mouse prefrontal cortex and hypothalamus

  • Kim, Gyeongwha;Jung, Soonwoong;Son, Hyeonwi;Kim, Sujeong;Choi, Jungil;Lee, Dong Hoon;Roh, Gu Seob;Kang, Sang Soo;Cho, Gyeong Jae;Choi, Wan Sung;Kim, Hyun Joon
    • BMB Reports
    • /
    • 제47권6호
    • /
    • pp.324-329
    • /
    • 2014
  • Regulators of G-protein signaling (RGS) proteins regulate certain G-protein-coupled receptor (GPCR)-mediated signaling pathways. The GABAB receptor ($GABA_BR$) is a GPCR that plays a role in the stress response. Previous studies indicate that acute immobilization stress (AIS) decreases RGS4 in the prefrontal cortex (PFC) and hypothalamus (HY) and suggest the possibility of a signal complex composed of RGS4 and $GABA_BR$. Therefore, in the present study, we tested whether RGS4 associates with $GABA_BR$ in these brain regions. We found the co-localization of RGS4 and $GABA_BR$ subtypes in the PFC and HY using double immunohistochemistry and confirmed a direct association between $GABA_{B2}R$ and RGS4 proteins using co-immunoprecipitation. Furthermore, we found that AIS decreased the amount of RGS4 bound to $GABA_{B2}R$ and the number of double-positive cells. These results indicate that $GABA_BR$ forms a signal complex with RGS4 and suggests that RGS4 is a regulator of $GABA_BR$.

Expression of pro-opiomelanocortin and agouti-related protein in the hypothalamus of caffeine-administered rats

  • Jeong, Joo-Yeon;Ku, Bo-Mi;Lee, Yeon-Kyung;Ryu, Jin-Hyun;Choi, Jung-Il;Kim, Joon-Soo;Cho, Yong-Woon;Roh, Gu-Seob;Kim, Hyun-Joon;Cho, Gyeong-Jae;Choi, Wan-Sung;Kang, Sang-Soo
    • Animal cells and systems
    • /
    • 제15권3호
    • /
    • pp.203-210
    • /
    • 2011
  • In the present study, we examined the effects of caffeine on food intake and body weight, and pro-opiomelanocortin (POMC) and agouti-related protein (AgRP) expression in the hypothalamus. Rats were administered intraperitoneally with 100 mg/kg caffeine (a high, non-toxic dose) or saline during the light phase. Intraperitoneal administration of caffeine induced a significant reduction in food intake and body weight 12 hr after treatment. In addition, POMC expression was significantly increased and AgRP expression was decreased in the arcuate nucleus (Arc) after caffeine treatment. These results demonstrate that administration of caffeine up-regulates POMC expression and down-regulates AgRP expression in the Arc, suggesting that the activation of the hypothalamic POMC neurons and inhibition of the AgRP neurons might play a role in the regulation of food intake and body weight by caffeine.