TY - JOUR
T1 - Xenin - A novel suppressor of food intake in rats
AU - Alexiou, Ch
AU - Zimmermann, J. P.
AU - Schick, R. R.
AU - Schusdziarra, V.
PY - 1998/8/3
Y1 - 1998/8/3
N2 - Peptides related to the amphibian octapeptide xenopsin are present in various locations in mammalians, such as the gastrointestinal mucosa or brain tissue. In the gastrointestinal tract, xenopsin-related peptides induce partially neurogenic contractions of the colon in humans. In brain, however, their function is not known. Structural similarities of xenopsin-related peptides with neurotensin, a known modulator of ingestive behavior, suggest a possible role in feeding regulation. Therefore, we examined the effect of xenin, a recently identified xenopsin-related pentacosa peptide, on feeding behavior of fasted rats. Male Wistar rats (n = 12) were intracerebroventricularly (i.c.v.) injected with either saline (10 μl) or xenin at 0.5, 1.5, 5 or 15 μg dissolved in an identical volume of 10 μl, respectively. In further experiments, xenin 15 μg/0.5 μ1 or 0.5 μ1 saline were injected into the lateral hypothalamus (LH). After injections, food intake (g), percentage of time spent with feeding (%) and prandial water intake (ml) were subsequently recorded for 2 h. After i.c.v. injection of 15 μg of xenin 1-h food intake was significantly reduced by 42% and 2-h food intake was diminished by 25%, respectively, compared to saline injection (p < 0.01). This reduction of food intake was paralleled by a significant decrease of time spent with feeding by 41% (after 1 h) or 23% (after 2 h). The xenin- induced suppression of feeding behavior was dose-dependent. Thus, the minimal effective dose of xenin was 1.5 μg, while the dose of 0.5 μg was ineffective. Prandial water intake was significantly reduced only by the highest dose of xenin. Following injection of 15 μg of xenin into the lateral hypothalamus food intake was not different from control experiments. These data demonstrate a potent feeding suppressive action of xenin following intracerebroventricularly injection but not injection into the lateral hypothalamus suggesting a possible role of xenin in the central control of feeding termination and satiety.
AB - Peptides related to the amphibian octapeptide xenopsin are present in various locations in mammalians, such as the gastrointestinal mucosa or brain tissue. In the gastrointestinal tract, xenopsin-related peptides induce partially neurogenic contractions of the colon in humans. In brain, however, their function is not known. Structural similarities of xenopsin-related peptides with neurotensin, a known modulator of ingestive behavior, suggest a possible role in feeding regulation. Therefore, we examined the effect of xenin, a recently identified xenopsin-related pentacosa peptide, on feeding behavior of fasted rats. Male Wistar rats (n = 12) were intracerebroventricularly (i.c.v.) injected with either saline (10 μl) or xenin at 0.5, 1.5, 5 or 15 μg dissolved in an identical volume of 10 μl, respectively. In further experiments, xenin 15 μg/0.5 μ1 or 0.5 μ1 saline were injected into the lateral hypothalamus (LH). After injections, food intake (g), percentage of time spent with feeding (%) and prandial water intake (ml) were subsequently recorded for 2 h. After i.c.v. injection of 15 μg of xenin 1-h food intake was significantly reduced by 42% and 2-h food intake was diminished by 25%, respectively, compared to saline injection (p < 0.01). This reduction of food intake was paralleled by a significant decrease of time spent with feeding by 41% (after 1 h) or 23% (after 2 h). The xenin- induced suppression of feeding behavior was dose-dependent. Thus, the minimal effective dose of xenin was 1.5 μg, while the dose of 0.5 μg was ineffective. Prandial water intake was significantly reduced only by the highest dose of xenin. Following injection of 15 μg of xenin into the lateral hypothalamus food intake was not different from control experiments. These data demonstrate a potent feeding suppressive action of xenin following intracerebroventricularly injection but not injection into the lateral hypothalamus suggesting a possible role of xenin in the central control of feeding termination and satiety.
KW - Feeding behavior
KW - Food intake
KW - Hypothalamic injection
KW - Intracerebroventricular injection
KW - Satiety
KW - Xenin
UR - http://www.scopus.com/inward/record.url?scp=0032479990&partnerID=8YFLogxK
U2 - 10.1016/S0006-8993(98)00535-6
DO - 10.1016/S0006-8993(98)00535-6
M3 - Article
C2 - 9685684
AN - SCOPUS:0032479990
SN - 0006-8993
VL - 800
SP - 294
EP - 299
JO - Brain Research
JF - Brain Research
IS - 2
ER -