TAILIEUCHUNG - Serum leptin profiles, food intake, and body weight in melatonin-implanted Syrian hamsters (Mesocricetus auratus) exposed to long and short photoperiods

The present study aimed to assess the effects of subcutaneous melatonin implants under different photoperiodic conditions: did the implants affect serum leptin levels, body weight, food consumption, and/or testicular weight male hamsters were exposed to long and short photoperiods for 10 weeks and received subcutaneous melatonin implants (1 mg in 24 mg beeswax) every 2 weeks. | Turkish Journal of Biology Research Article Turk J Biol (2014) 38: 185-192 © TÜBİTAK doi: Serum leptin profiles, food intake, and body weight in melatonin-implanted Syrian hamsters (Mesocricetus auratus) exposed to long and short photoperiods Bülent GÜNDÜZ* Department of Biology, Faculty of Arts and Sciences, Çanakkale Onsekiz Mart University, Çanakkale, Turkey Received: Accepted: Published Online: Printed: Abstract: We have shown that circadian changes in leptin concentrations are inversely linked to circulating melatonin levels in the Syrian hamster. The present study aimed to assess the effects of subcutaneous melatonin implants under different photoperiodic conditions: did the implants affect serum leptin levels, body weight, food consumption, and/or testicular weight? Male hamsters were exposed to long and short photoperiods for 10 weeks and received subcutaneous melatonin implants (1 mg in 24 mg beeswax) every 2 weeks. Blood samples were collected every week at midday (1200 hours) or midnight (0000 hours) to assess leptin and melatonin concentrations. Testes were measured to calculate weight. Body weight and food intake were determined every week. Melatonin implants blocked the testicular regression produced by short photoperiods. No differences in body weight were observed among any of the groups. Food consumption increased only with the melatonin implant in the short photoperiod. Serum leptin levels in both photoperiods remained constant. Differences were apparent between noon and night leptin profiles. Noon leptin levels were high (16–18 ng/mL) compared to night leptin levels (8–11 ng/mL) in untreated controls. On the other hand, serum leptin concentrations declined in melatoninimplanted hamsters in both photoperiods. The effects of melatonin on leptin hormone profiles are very pronounced, and melatonin seems to have both physiologically and .

• Sinh học
• Serum leptin profiles
• Pineal gland
• Subcutaneous melatonin
• Syrian hamsters Mesocricetus auratus
• Food intake
• Food Additives
• Food Additive Intake Assessment
• Benefits of Food Additives
• The Role of Food Additives
• Consumer Attitudes Toward Food Additives
• Food Additives in the European Union
• Salt intake
• United arab emirates
• Food frequency questionnaire
• Multiple correspondence analysis
• BMC Pediatrics
• Childhood obesity
• Physical activity
• Energy balance
• Food choice
• Comfort food
• Nutritional assessment
• Dietary intake
• School going children
• Food habits
• Abant trout
• Salmo trutta abanticus
• Rainbow trout
• Oncorhynchus mykiss
• Feed conversion ratio
• Receptor activator of NF κB ligand
• Cocaine and amphetamine regulated transcript
• Neuropeptide Y
• Nuclear factor κB ligand
• Chemical and Biological science
• High fat diet
• Body weight
• Tissue weight
• Biological science
• Complementary feeding
• Food and nutrient intake
• Public health
• Nutrients’ intake
• Edema of the scrotum
• All limbs food intake
• German shepherd dog
• Therapeutic management of Eehrlichiosis
• Reduced food intake
• Estimated Average Requirement
• Energy dense nutrient poor
• Per capita intake
• Non Indigenous boy
• Dairy intake
• Nutrient rich foods
• Nutrient intakes
• Influence nutrient intakes
• Exceptional children
• Potential confounders
• Inadequate intake
• Out patient
• Intercostal retraction
• Subcostal retraction
• Supracostal retractions
• Respiratory syncytial virus
• Dietary guidelines
• Remarkable nutrition transition
• Nutrient adequacy
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• báo cáo y học
• công trình nghiên cứu về y học
• tài liệu về y học
• cách trình bày báo cáo
• Scientific reports
• scientific research
• biochemistry
• medical knowledge
• medical research
• analysis of cytoplasmic
• genetics
• Structural biochemistry
• Structural Biology
• Cancer research
• Metazoan Parasaites
• European Sea Bass
• Analysis Using
• Strategic Cost
• Management Practices
• trình bày báo cáo
• tài liệu báo cáo khoa học
• nghiên cứu y học
• kiến thức y học
• Communication box
• Hypothalamic–pituitary–adrenal axis
• Lidocaine hydrochloride
• Female mice
• Parental food intake
• Dietary patterns
• Children’s overweight and obesity
• Children’s age
• Areas distribution
• BMC Cancer
• Blood pressure
• Renin angiotensin system
• Cisplatin nephrotoxicity
• BMC Musculoskeletal Disorders
• Halo vest
• Food intake level
• Cervical alignment
• X rays
• BMC Genomics
• Residual feed intake
• Ruminants play
• High quality human food
• Animal protein