Effects of body weight on locomotor activity and auditory startle response in neonatal rats

2009 ◽  
Vol 31 (4) ◽  
pp. 244
Author(s):  
Melissa Beck ◽  
Julie Varsho ◽  
Donald Stump ◽  
Mark Nemec
Keyword(s):  
Body Weight ◽  
Locomotor Activity ◽  
Startle Response ◽  
Neonatal Rats ◽  
Auditory Startle Response

Body weight and auditory startle response in rat offspring permanently changed after reprogramming by diet and early exposure to MeHg

2011 ◽  
Vol 32 (2) ◽  
pp. 176-177
Author(s):  
Joantine Van Esterik ◽  
Celine De Esch ◽  
Reinier Kaiser ◽  
Henk Hendriks ◽  
Roderick Slieker ◽  
...  
Keyword(s):  
Body Weight ◽  
Startle Response ◽  
Early Exposure ◽  
Rat Offspring ◽  
Auditory Startle Response

scholarly journals Neonatal exposure to citalopram, a serotonin selective reuptake inhibitor, programs a delay in the reflex ontogeny in rats

2008 ◽  
Vol 66 (3b) ◽  
pp. 736-740 ◽  
Author(s):  
Teresa Cristina Bomfim de Jesus Deiró ◽  
Judelita Carvalho ◽  
Elizabeth do Nascimento ◽  
Jaiza Maria Barreto Medeiros ◽  
Fabiana Cajuhi ◽  
...  
Keyword(s):  
Body Weight ◽  
Weight Gain ◽  
Startle Response ◽  
Body Weight Gain ◽  
Behavioral Responses ◽  
Free Fall ◽  
Perinatal Period ◽  
The Body ◽  
Auditory Startle Response ◽  
Serotonin Selective Reuptake Inhibitor

Serotonin influences the growth and development of the nervous system, as well as its behavioral manifestations. The possibility exists that increased brain serotonin availability in young animals modulates their neuro-behavioral responses. This study investigated the body weight gain and reflex ontogeny of neonatal rats treated during the suckling period with two doses of citalopram (5 mg, or 10 mg/kg, sc, daily). The time of the appearance of reflexes (palm grasp righting, free-fall righting, vibrissa placing, auditory startle response, negative geotaxis and cliff avoidance) as well as the body weight evolution were recorded. In general, a delay in the time of reflex development and a reduced weight gain were observed in drug-treated animals. These findings suggest that serotoninergic mechanisms play a role in modulating body weight gain and the maturation of most reflex responses during the perinatal period in rats.

Effects of refeeding of undernourished and insulin treatment of diabetic neonatal rats on IGF and IGFBP

1996 ◽  
Vol 271 (2) ◽  
pp. E223-E231 ◽  
Author(s):  
L. Goya ◽  
F. Rivero ◽  
M. A. Martin ◽  
R. Arahuetes ◽  
E. R. Hernandez ◽  
...  
Keyword(s):  
Growth Hormone ◽  
Body Weight ◽  
Growth Factor ◽  
Mrna Expression ◽  
Insulin Treatment ◽  
Diabetic Rats ◽  
Insulin Like Growth Factor ◽  
Neonatal Rats ◽  
Igf I ◽  
Serum Gh

The effect of refeeding and insulin treatment of undernourished and diabetic neonatal rats, respectively, on the regulation of insulin-like growth factor (IGF) and insulin-like growth factor binding protein (IGFBP) was investigated. The changes in body weight, insulinemia, glycemia, serum IGF-I, and growth hormone (GH) as well as the increase of the 30-kDa IGFBP in undernourished and diabetic neonatal rats previously shown elsewhere were reversed by refeeding and insulin treatment, respectively. Also, changes in liver mRNA expression of IGF-I and-II and IGFBP-1 and -2 were restored in refed undernourished and IGF-I and IGFBP-1 levels recovered in insulin-treated diabetic rats. However, serum GH was still below normal after rehabilitation in both situations. Thus the present results support the idea of a GH-independent IGF/ IGFBP regulation mediated by a balance of insulin and nutrients as has already been suggested in previous neonatal studies.

scholarly journals Effects of photoperiod on daily locomotor activity, energy expenditure, and feeding behavior in a seasonal mammal

2010 ◽  
Vol 298 (5) ◽  
pp. R1409-R1416 ◽  
Author(s):  
Amy Warner ◽  
Preeti H. Jethwa ◽  
Catherine A. Wyse ◽  
Helen I'Anson ◽  
John M. Brameld ◽  
...  
Keyword(s):  
Body Weight ◽  
Locomotor Activity ◽  
Energy Expenditure ◽  
Feeding Behavior ◽  
Heat Production ◽  
Prolonged Exposure ◽  
Dark Phase ◽  
Daily Rhythms ◽  
Dark Cycle ◽  
Activity Energy

The objective of this study was to determine whether the previously observed effects of photoperiod on body weight in Siberian hamsters were due to changes in the daily patterns of locomotor activity, energy expenditure, and/or feeding behavior. Adult males were monitored through a seasonal cycle using an automated comprehensive laboratory animal monitoring system (CLAMS). Exposure to a short-day photoperiod (SD; 8:16-h light-dark cycle) induced a significant decline in body weight, and oxygen consumption (V̇o2), carbon dioxide production (V̇co2), and heat production all decreased reaching a nadir by 16 wk of SD. Clear daily rhythms in locomotor activity, V̇o2, and V̇co2 were observed at the start of the study, but these all progressively diminished after prolonged exposure to SD. Rhythms in feeding behavior were also detected initially, reflecting an increase in meal frequency but not duration during the dark phase. This rhythm was lost by 8 wk of SD exposure such that food intake was relatively constant across dark and light phases. After 18 wk in SD, hamsters were transferred to a long-day photoperiod (LD; 16:8-h light-dark cycle), which induced significant weight gain. This was associated with an increase in energy intake within 2 wk, while V̇o2, V̇co2, and heat production all increased back to basal levels. Rhythmicity was reestablished within 4 wk of reexposure to long days. These results demonstrate that photoperiod impacts on body weight via complex changes in locomotor activity, energy expenditure, and feeding behavior, with a striking loss of daily rhythms during SD exposure.

Effects of Hypoxia on the Development of Intestinal Enzymes in Neonatal and Juvenile Rats

2003 ◽  
Vol 228 (6) ◽  
pp. 717-723 ◽  
Author(s):  
Ping C. Lee ◽  
Mark Struve ◽  
Hershel Raff
Keyword(s):  
Body Weight ◽  
Small Intestine ◽  
Hypoxic Exposure ◽  
Neonatal Rats ◽  
Juvenile Rats ◽  
Intestinal Enzymes ◽  
Jejunal Segment ◽  
Maltase Activity ◽  
Small Intestinal ◽  
Delayed Maturation

Hypoxia in the neonate is known to alter the activity of hepatic and pancreatic enzymes involved in lipid and carbohydrate metabolism. The purpose of this study was to evaluate the effect of neonatal hypoxia on the activity of intestinal enzymes, and to determine whether the administration of glucocorticoids to neonates can mimic the effects of hypoxia. Hypoxia in neonatal rats (0–7 days) increased protein content, and lactase and maltase activity in the duodenal and the jejunal segments of the small intestine compared with normoxic controls. Hypoxia in juvenile rats (28–35 days) did not change these enzymes. Two weeks after returning hypoxic (0–7 days) pups to normoxia, their body weight remained lower than the age-matched controls. In the group recovering from hypoxia, sucrase, maltase, and leucine aminopeptidase activities were lower in the duodenal and the jejunal segment. Compared with controls, LDH activity was lower only in the jejunal intestine in the group recovering from hypoxia. All enzyme activities returned to control levels 3 weeks after recovery. Neonatal rats treated with dexamethasone had a decrease in body weight, but increases in sucrase and maltase activity in both the duodenal and the jejunal segment. Hypoxia in newborn rats caused a delayed maturation of small intestinal enzymes. Increases in serum glucocorticoids after hypoxic exposure probably do not play a major role in the delayed maturation of the disaccharidase activity in the small intestine.

scholarly journals Lateral Hypothalamic Area Neurotensin Neurons Are Required for Control of Orexin Neurons and Energy Balance

Endocrinology ◽  
2018 ◽  
Vol 159 (9) ◽  
pp. 3158-3176 ◽  
Author(s):  
Juliette Brown ◽  
Andrew Sagante ◽  
Thomas Mayer ◽  
Anna Wright ◽  
Raluca Bugescu ◽  
...  
Keyword(s):  
Body Weight ◽  
Locomotor Activity ◽  
Energy Balance ◽  
Large Population ◽  
Lateral Hypothalamic Area ◽  
Hypothalamic Area ◽  
Genetic Ablation ◽  
Lateral Hypothalamic ◽  
Adult Mice ◽  
Locomotor Behaviors

Abstract The lateral hypothalamic area (LHA) is essential for motivated ingestive and locomotor behaviors that impact body weight, yet it remains unclear how the neurochemically defined subpopulations of LHA neurons contribute to energy balance. In particular, the role of the large population of LHA neurotensin (Nts) neurons has remained ambiguous due to the lack of methods to easily visualize and modulate these neurons. Because LHA Nts neurons are activated by leptin and other anorectic cues and they modulate dopamine or local LHA orexin neurons implicated in energy balance, they may have important, unappreciated roles for coordinating behaviors necessary for proper body weight. In this study, we genetically ablated or chemogenetically inhibited LHA Nts neurons in adult mice to determine their necessity for control of motivated behaviors and body weight. Genetic ablation of LHA Nts neurons resulted in profoundly increased adiposity compared with mice with intact LHA Nts neurons, as well as diminished locomotor activity, energy expenditure, and water intake. Complete loss of LHA Nts neurons also led to downregulation of orexin, revealing important cross-talk between the LHA Nts and orexin populations in maintenance of behavior and body weight. In contrast, chemogenetic inhibition of intact LHA Nts neurons did not disrupt orexin expression, but it suppressed locomotor activity and the adaptive response to leptin. Taken together, these data reveal the necessity of LHA Nts neurons and their activation for controlling energy balance, and that LHA Nts neurons influence behavior and body weight via orexin-dependent and orexin-independent mechanisms.

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