• 한국수산과학회지
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• 제41권2호
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• pp.125-133
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• 2008

To investigate the effect of repeated food deprivation and refeeding on the hyperphagia, compensatory growth, feed efficiency, body composition, hepatosomatic index (HSI), and survival rate of the juvenile olive flounder Paralichthys olivaceus, an experiment was conducted for 90 days. Feeding treatments consisted of the following five regimes for 90 days from August to October, 2005: C: daily satiation feeding (control), S1: 1-day satiation feeding after 1-day food deprivation, S2: 1-day satiation feeding after 2-day food deprivation, S3: 1-day satiation feeding after 3-day food deprivation and S4: 1-day satiation feeding after 4-day food deprivation, respectively. Although the monthly feed intake (MFI) of the control was significantly higher than that of all of the starved groups, the daily feed intake (DFI) was more higher in S1, S2, and S3 than that in the control as a result of hyperphagia after starvation. While the feed efficiency in the summer (to day 30) decreased in all of the starved groups with prolongation of the starvation period, the feed efficiency in the autumn (to day 90) was increased with prolongation of the starvation period. The whole body proximate composition and HSI were also affected by starvation. The crude protein, lipid, and HSI decreased with prolongation of the starvation period, whereas the crude ash and moisture increased. The growth rate and condition factor also decreased in proportion to the starvation period. The survival rate was highest in the control and was the lowest in S4. In this study, although hyperphagia occurred in the deprived groups, we knew that the compensatory growth did not always occur.

• 생명과학회지
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• 제33권10호
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• pp.828-834
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• 2023

쌍별귀뚜라미(Gryllus bimaculatus)에서 분리한 막전단백질 258(transmembrane protein 258, Tmem258)을 코딩하는 cDNA를 GbTmem258로 이름 붙였다. 이 단백질은 80개의 아미노산으로 구성되어 있으며, N-glycosylation site가 없고, 각각 2개의 serine과 threonine, 1개의 tyrosine 잔기로 구성된 5개의 잠재적 인산화 부위를 가지고있다. GbTmem258 단백질은 분자량은 9.06 kDa이며 이론적 등전점은 5.5으로 계산되었으며, alpha-helix (52.5%), random coils (22.5%), extended strands (16.25%), beta turns (8.75%)의 2차 구조 정보를 기반으로 GbTmem258의 3차 구조가 작성되었다. 그리고, GbTmem258은 다른 종의 Tmem258와 아미노산 수준에서 높은 상동성을 보였다. 이 연구에서는 기아와 먹이 공급에 의해 GbTmem258 발현 조절이 어떻게 영향을 받는지 조사하였다. 기아가 지속되는 동안 hindgut에서 GbTmem258 발현이 점진적으로 증가하여 기아 6일 후 대조군보다 1.5배 높은 수준이 되었다. 그러나 6일간의 기아상태가 끝난 후 하루 또는 이틀 동안 다시 먹이를 주면 GbTmem258 발현이 대조군 수준으로 회복되었다. 지방에서는 기아 동안 대조군에 비해서 GbTmem258 발현이 최대 3배까지 증가했지만, 6일 기아 후 하루 또는 이틀 동안 다시 먹인 후에는 발현이 약 2.5배 증가로 감소되었다. 굶기고 다시 먹이는 실험 내내 각각의 조직에서 주목할만한 GbTmem258 발현은 관찰되지 않았다.

• 대한한방소아과학회지
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• 제19권2호
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• pp.1-11
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• 2005

Objectives : The purpose of this study is to investigate the effect of fasting therapy on the changes of body composition in obese adolescents. Methods : We examined the body composition of obese adolescents three times; before fasting, on the second refeeding day, two or four weeks later. Results : Body weight, body mass index(BMI), basal metabolic rate(BMR) and lean body mass (LBM) were decreased during the fasting, whereas percent-fat was increased. After fasting, patients have the dietary period. During this period BMR and LBM were increased and the decrease of percent-fat was continued. Conclusions : It seems that fasting therapy with keeping up well-controlled dietary period and receiving oriental medical management can be useful to decrease percent-fat in obese patients.

• 미생물학회지
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• 제26권1호
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• pp.44-51
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• 1988

The intracellular free radicals produced at different stages of cell cycle of Saccharomyces cerevisiae ATCC 24858 were investigated by means of electron spin resonance(ESR) spectroscopy. The synchronized cells by repeated starvation and refeeding revealed different ESR spectral pattern compared to that of asynchronized cells. Each spectrum centered at g=2.005, which indicates free radicals. The relative spin concentration was maximat at the end of DNA increase. The variation of the relative spin concentration at each distinct stage of the cell cycle was evaluated in relation to ascorbate concentration, L-galactonolactone oxidase activity, and ascorbate oxidase activity. The highest activities of L-galactonolactone oxidase and ascorbate oxidase were detected just before and at the maximum of relative spin concentration, respectively. And ascorbate concentration fluctuated through each stage of cell cycle with the changes of relative spin concentration, L-galactonolactone oxidase activity, and ascorbate oxidase activity. Thus it is suggested that intracellular free radicals should be related to cell cycle, interacted with ascorbate, and may play an important role in the cell cycle of Saccharomyces cerevisiae.

• Applied Biological Chemistry
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• 제23권1호
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• pp.23-30
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• 1980

분리된 간세포핵을 $[{\gamma}-32P]$ ATP와 5분간 $37^{\circ}C$ 에서 배양한 뒤 Chromatin 단백질의 32P labelling을 관찰했다. 32P labelling의 pattern을 48시간 단식상태 및 48시간 굶긴 쥐에게 탄수화물 농도가 높은 먹이를 준 다음 12시간 경과한 쥐와 streptozotocin으로 당뇨병을 유발시킨 쥐에 인슈린을 투여한 뒤 6시간 경과한 쥐의 세포핵으로부터 추출한 핵단백질을 sodium dodecyl sulfate 전기영동으로 조사하였다. 48시간 굶은 쥐의 간세포핵의 경우에서는 0.14M NaCl에 용해하는 단백질의 인산화 수준은 정상적으로 먹이를 준 쥐에 비하여 분자량이 $41,000{\sim}200,000$ daltons 사이의 단백질에서는 감소되었다. 48시간 굶긴 쥐에서 본 인산화 감소를 12시간 내에 역전시켜 정상적으로 먹이를 준 쥐에서 관찰한 인산화 수준에까지 끌어 올렸다. 폐놀용해성 핵단백질의 인산화 수준은 분자량이 59,000 daltons보다 큰 5단백질에서 48시간 굶긴 쥐에서 정상적으로 먹이를 준 쥐의 결과와 비교하였을 때 낮았다. 아울러 단식은 히스톤의 인산화도 감소되었다. Streptozotocin으로 당뇨병을 유발시킨 쥐에게 인슈린 주사를 준 다음 6시간 경과한 쥐의 인산화 수준은 0.14M NaCl 용해성 핵단백질중 분자량이 130,000 daltons 단백질과 페놀용해성 단백질의 경우에는 155,000 daltons 단백질에서 인슈린을 주지 않은 당뇨병을 가진 쥐와 비교하였을 때 증가를 보였다. 그러나 히스톤의 인산화 수준에는 큰 변화가 나타나지 않았다. 여기에 나타난 실험결과가 0,14M NaCl 용해성 핵단백질과 $H_1$ 히스톤의 인산화와 탈인산화가 다른 핵단백질에 선행해서 일어난다는 가능성을 시사해 주고 있다. 그리고 인슈린 신호가 핵단백질의 인산화와 관련이 있는 반면 그루카곤(glucagon)은 핵단백질의 탈인산화와 상관관계가 있음은 매우 흥미있는 사실이다.

• 한국임상수의학회지
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• 제28권6호
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• pp.581-585
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• 2011

자연적 혹은 인위적 환우 기간의 절식은 산란계에서 심각한 대사성 스트레스가 될 수 있다. 절식 그리고 필수적으로 수반되는 사료 재급여 증후군의 대사성 스트레스는 ATP 생성과 밀접한 $Mg^{2+}$, $K^+$과 P 등의 무기염류 불균형을 야기할 수 있다. $Mg^{2+}$은 생체 대상과정에서 필수적인 무기염류이며 스트레스는 생체 $Mg^{2+}$ 요구량을 증가시킬 뿐만 아니라 $Mg^{2+}$ 결핍을 야기할 수 있기 때문에 산란계에서 환우 기간의 절식에 관련된 혈액내 이온의 이온화 농도 및 결합형을 포함한 총농도의 변동을 관찰하였다. 환우 후에 대사성 스트레스와 관련된 생화학 인자의 변화와 수반하여 혈액내 $Mg^{2+}$과 $K^+$의 감소가 관찰되었다. 따라서 환우 기간의 절식 및 사료 재급여 증후군은 심각한 저마그네슘혈증 및 저칼륨혈증을 야기할 수 있으므로 환우 그리고 재급여 과정에서 $Mg^{2+}$과 $K^+$의 투여가 권장된다.

• 한방비만학회지
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• 제16권1호
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• pp.50-63
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• 2016

Objectives: The aim of this study is to analyze methods and outcomes about fasting for obesity in korea medicine research. Methods: We searched the studies with key words of 'obesity' and 'fasting or starvation' in Korean database (Korean traditional knowledge portal, OASIS, KISS, KMBASE, DBPIA, RISS). Studies were analyzed for contents, evaluation methods and adverse effects. Results: Twenty-one studies were reviewed. Studies were published in 1983~2015. 1. Studies can be classified into three types: comparative study on before and after, comparative study between groups, case study on other disease occurred during the fasting therapy period. 2. The most common step of fasting were 3 steps: reducing food intakes period (3~5 days), fasting period (7~10 days) and refeeding period (3~5 days) and additional period-diet period (28 days). 3. The most common evaluation methods were body weight (BW), body fat mass (BFM), muscle weight (MW), fat free mass, body mass index, body fat percentage, etc. 4. BW, BFM, MW were reduced largely in fasting period. 5. The most common adverse effects were fatigue, nausea, headache, vomiting, insomnia, etc. Conclusions: As a result of the review papers, fasting therapy have positive effects for obesity. To verify the effectiveness of the fasting, more studies are needed such as randomized controlled trial.

• 대한수의학회지
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• 제30권1호
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• pp.15-27
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• 1990

Effects of oral administration of electrolyte solutions were studied in experimentally dehydrated adult sheep. By the latin square method five ruminal fistulated sheep were examined and dehydrated by deprivation of feed and water for 72 hours. Tap water, physiological saline, 0.45% NaCl+120 mM/L glucose and 0.9% NaCl+1% propylene glycol solution were orally administrated after dehydration, respectively. Rehydration effect and modification of the rumen function were compared. 1. After 72 hours of deprivation of feed and water, sheep were hypertonic dehydrated and blood acid-base parameters were not significantly changed. And there was marked increase in ruminal pH and decrease in ruminal total volatile fatty acid(VFA) concentration. 2. After the fluids administration the changes in blood acid-base parameters were not significant in all groups. 3. Although glucose fermentation in the rumen was observed, 0.45% NaCl+120 mM/L glucose was more effective in rehydration than physiological saline and tap water. But it was difficult to know the rehydration effect of 0.9% NaCl+1% propylene glycol solution exactly because of excessive increase in plasma osmolality. 4. After refeeding, total concentration and proportions of ruminal volatile fatty acid(VFA) were not significantly different among groups and recovered to normal concentration but not in proportions after 2 days in all groups. 5. In vitro cultured ruminal protozoa were susceptible to the decrease of the pH and osmolality.

• Asian-Australasian Journal of Animal Sciences
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• 제6권3호
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• pp.401-410
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• 1993

Day-old male and female broilers obtained from commercial strain (Hubbard) were used in this study. At 7 days of age, all chicks were weighed individually (female 0.11 kg and male 0.12 kg in average) and divided into 5 group of 45 birds each group with no replicate in each treatment group as follows: 1. fed ad libitum; 2. fed 75% ad libitum; 3. fed 65% ad libitum; 4. fed 55% ad libitum; 5. fed 45% ad libitum. Chicks were restricted for 10 days (d 7 through 17) of a 56-day trial. Chicks were fed a commercial starter diet (crude protein (CP) 23.8% and metabolizable energy (ME) 3,070 kcal/kg) for 21 days, and commercial finisher diet (CP 20% and ME 3,160 kcal/kg) from 22 to 56 days of age. When chicks were feed-restricted at an early age, compensatory growth did not immediately occur following refeeding. Body weights of restricted chicks were not equal to the ad libitum chicks before 49 days of age. At 56 dyas of age, body weights of restricted chicks were heavier (p<0.01). Abdominal fat values of female chicks fed ad libitum was not significantly different from those fed 45% to 75% ad libitum. Carcass fat values of restricted female chicks were lower than those of control chicks when female chicks were fed either 55% or 45% ad libitum. Furthermore, feed efficiencies of restricted chicks were better. The response of chicks to early feed restriction might depend on the degree of feed restriction, and sex. Factors contributing carcass fat included energy loss, fat protein ratio of carcass, fatty acid synthesis in the liver and triglyceride content of the liver. The heavier body weights in the restricted chicks might be correlated with the lower growth rate during period of feed restriction.

• Asian-Australasian Journal of Animal Sciences
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• 제25권9호
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• pp.1300-1308
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• 2012

The 5'-adenosine monophosphate-activated protein kinase (AMPK) is a key part of a kinase-signaling cascade that acts to maintain energy homeostasis. The objective of this experiment was to investigate the possible effects of fasting and refeeding on the gene expression of hypothalamic AMPK, some appetitive regulating peptides and lipid metabolism related enzymes. Seven-day-old male broiler (Arbor Acres) chicks were allocated into three equal treatments: fed ad libitum (control); fasted for 24 h; fasted for 24 h and then refed for 24 h. Compared with the control, the hypothalamic gene expression of $AMPK{\alpha}2$, $AMPK{\beta}1$, $AMPK{\beta}2$, $AMPK{\gamma}1$, Ste20-related adaptor protein ${\beta}$ ($STRAD{\beta}$), mouse protein $25{\alpha}$ ($MO25{\alpha}$) and agouti-related peptide (AgRP) were increased after fasting for 24 h. No significant difference among treatments was observed in mRNA levels of $AMPK{\alpha}1$, $AMPK{\gamma}2$, LKB1 and neuropeptide Y (NPY). However, the expression of $MO25{\beta}$, pro-opiomelanocortin (POMC), corticotropin-releasing hormone (CRH), ghrelin, fatty acid synthase (FAS), acetyl-CoA carboxylase ${\alpha}$ ($ACC{\alpha}$), carnitine palmitoyltransferase 1 (CPT-1) and sterol regulatory element binding protein-1 (SREBP-1) were significantly decreased. The present results indicated that 24 h fasting altered gene expression of AMPK subunits, appetite regulation peptides and lipometabolism related factors in chick's hypothalamus; the hypothalamic FAS signaling pathway might be involved in the AMPK regulated energy homeostasis and/or appetite regulation in poultry.