• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제31권5호
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• pp.363-369
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• 2005

Purpose: To determine the role of Insulin-like Growth Factor-I (IGF-I) in the regulation of Vascular Endothelial Growth Factor (VEGF) expression in MG-63 cells and then to find the mechanism b which this regulation occurs. Materials and methods: MG-63 cells were grown to confluence in 60-mm dishes. To determine the effects of IGF-I on expression of VEGF mRNA according to time and concentration, the cells were treated with 10 nM IGF-I, following isolation of total RNA and Northern blot analysis after 1, 2, 4, 8, 12, 24 hours and after 2 hours of treatment with 0.5, 2, 10, 25, 50 nM IGF-I respectively, isolation of total RNA and Northern blot analysis were followed. To determine the mechanism of action of IGF-I, inhibitors such as hydroxyurea $(76.1\;{\mu}g/ml)$, actinomycin D $(2.5\;{\mu}g/ml)$, cycloheximide $(10\;{\mu}g/ml)$ were added 1 hour after treatment of 10 nM IGF-I. Results: 1. the expression of VEGF mRNA was increased with treatment of IGF-I. 2. The expression of VEGF mRNA was increased according to time-and concentration dependent manner of IGF-I. 3. The effect of IGF-I was decreased by hydroxyuera, actinomycin D, but not by cycloheximide. Conclusion: IGF-I regulate the expression of VEGF mRNA in the level of DNA synthesis and transcription. These results could suggest that IGF-I plays an important role in angiogenesis in the process of new bone formation and remodeling.

• Asian-Australasian Journal of Animal Sciences
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• 제29권10호
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• pp.1451-1457
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• 2016

A comparative study was performed to investigate the efficacy of KiFAY as a feed additive on performance parameters, thyroid, and pancreatic hormone levels in broilers. Ninety birds (Vencobb 400) were randomly divided into three groups viz., Control (no DL-methionine supplementation), Treatment1 (containing added DL-methionine) and Treatment 2 (containing KiFAY and without DL-methionine supplementation). The performance parameters (weekly body weight, body weight gain, feed intake, and feed consumption ratio) were recorded and calculated during the whole study of 4 weeks. Analyses of insulin and insulin-like growth factor (IGF 1), triiodothyronine (T3), thyroxine (T4) and thyroid stimulating hormone (TSH) were performed at the end of the study. The results show that birds on supplementation of KiFAY performed significantly (p<0.001) better than other treatments. The weekly body weight, body weight gain, feed in-take and feed consumption ratio improved in KiFAY treated birds. The study found an increase in insulin and IGF1 levels (p<0.001) in KiFAY compared with the other treatments. Serum T3, T4, and TSH levels in the Treatment 2 were higher than other treatments (p<0.001). The KiFAY supplementation was able to improve performance with associated responses at a hormonal level in broilers.

• Asian-Australasian Journal of Animal Sciences
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• 제13권8호
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• pp.1121-1126
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• 2000

Daily variation in the serum concentrations of insulin and insulin-like growth factor-I and in the plasma concentrations of thyroxine and triiodothyronine were evaluated in ewes fed 30%, 100% and 200% of theoretical maintenance energy requirements. The single daily meal has had significant effects (p<0.05) on almost all profiles. In general, serum or plasma hormone concentrations have increased after the meal, in particular at the two higher levels of energy intake. In the group submitted to the lowest level of energy intake, the consequences of the meal on circulating levels were almost imperceptible. The effects of feeding levels on serum or plasma concentrations have widely varied among hormones, not showing any objective pattern or relationship. Because these variations may affect the interpretation of these blood indicators, knowledge of daily profiles and of the effect of feed level must be considered. In order to maximize the diagnostic value of those indicators, the most suitable times for blood collection seem to be 16 h after the meal and (or) just before the meal. The collection 16 h after the meal apparently allows the characterization of a relatively steady metabolic state, intermediate between the close effects of food intake and the final phase of the intensification of body reserves mobilization. The collection just before the meal will give a good indication of the level of activity of those mobilization mechanisms.

• 한국식품영양과학회지
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• 제29권3호
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• pp.493-499
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• 2000

골감소증 환자의 혈청중에 존재하는 IGFBP-5의 존재와 변화를 검토한 결과, 골감소즈 환자에서는 정상 대조군에 비해 IGFBP-5가 감소하였는데 이 변화는 IGFBP-5의 분해효소가 작용하기 때문인 것으로 나타났다. IGFBP-5에 작용하는 단백질분해효소 저해제중 metallo계인 EDTA 및 1,10-phenanthroline과 seriner계인 aprotinin, heparin, heparin cofactor 2(HC2), heparine+HC2가 IGFBP-5에 대해 저해효과가 크므로 metalloprotease이면서 serine protease의 성질을 가지는 효소들이 IGFBP-5에 작용하였다. IGF-I과 IGF-II 그리고 insulin은 효소 활성에 아무런 영향이 없었다. IGFBP-5의 zymography에서 정상인과 골감소증 환제어서 180 kDa 크기의 band가 나타났고, gelatin zymography에서 정상 대조군의 경우 66 kDa과 97 kDa 정도의 band가 확인되었고 골감소증 환자의 경우는 69 kDa의 band가 확인되었다.

• KSBB Journal
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• 제17권3호
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• pp.283-289
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• 2002

Insulin-like growth factor-I(IGF-I)은 성장호르몬의 여러 가지 성정촉진 작용을 매개하는 분열 유발성 폴리펩티드이며, 조직의 수선과 재생, 창상치유 및 골대사와 같은 과정들에서 중요한 역할을 하는 것으로 알려져 있고, 비교적 여러 조직에서 발현되고 있는 IGF-I 유전자의 전사조절에 대한 정확한 분자적 기전과 호르몬 및 대사 상태가 그것을 어떻게 조절하는지 아직 밝혀져 있지 않다. 쥐를 절삭시키므로써 대사 상태를 변조시켰을 때, 간 조직내 IGF-I mRNA의 발현에 미치는 절식의 영향을 살펴보기 위하여 solution hybridizatioon/RNase protection 방법으로 분석 하였다. IGF-I의 exon 1 및 exon 2에 의하여 encode된 tran-scripts 모두가 감소된 결과를 얻었고, 이러한 감소는 전사 수준에서 일어난 것으로 nuclear run-on 분석에 의하여 확인하였다. 또한 절식시킨 쥐에서 IGF-I mRNA의 양을 조절하는 cia-acting elements를 IGF-I 유전자의 5'-flanking 지역과 exon 1과 econ 2에서 밝히고자 절식시킨 쥐의 신선한 간조직에서 핵 추출물을 얻어 IGF-I의 여러 가지 DNA fragments와 반응시켜 DNase I protection 분석을 한 결과, IGF-I 유전자의 주요한 전사 개 시점으로부터 downstream에 있는 sequences가 절식으로 변조시킨 대사상태에서 IGF-I의 발현 조절에 중요하며 이곳에는 전사인자인 C/EBP family의 isoform들을 포함한 간조직에 풍부하게 존재하는 여러 전사인자들이 결합할 것으로 제안하였다.

• 대한생식의학회:학술대회논문집
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• 대한불임학회 1995년도 추계 학술대회 및 정기총회
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• pp.70.1-70.1
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• 1995

• BMB Reports
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• 제32권3호
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• pp.266-272
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• 1999

The insulin-like growth factor (IGF) system consisting of IGF-I, IGF-II, IGF-receptors, and IGF-binding proteins (IGFBP) regulates the proliferation of a variety of cancer cell types. To examine whether a decrease in endogenous IGFBP-3 stimulates proliferation or inhibits differentiation, Caco-2 cells, a human colon adenocarcinoma cell line, were stably transfected with an anti-sense IGFBP-3 expression construct or pcDNA3 vector as control. Accumulation of IGFBP-3 mRNA and secretion of IGFBP-3 into serum-free conditioned medium, 9 days after plating, were significantly lower in Caco-2 cell clones transfected with anti-sense IGFBP-3 cDNA compared to the controls. The anti-sense clones grew at a similar rate to the controls for 8 days after plating, but achieved a higher final density between days 10 and 12. The levels of sucrase-isomaltase mRNA, a marker of enterocyte differentiation of Caco-2 cells, were lower in the anti-sense clones examined on day 9. In conclusion, proliferation of Caco-2 cells can be stimulated by lowering endogenously-produced IGFBP-3.

• 대한생식의학회:학술대회논문집
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• 대한불임학회 2003년도 제45차 추계학술대회
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• pp.151-152
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• 2003

• 대한수의학회지
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• 제39권5호
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• pp.938-944
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• 1999

The insulin-like growth factor-I(IGF-I) is an important metabolic factor involved in cell growth and metabolism. Although secretion of IGF-I in rat liver is regulated by growth hormone, the effects of forskolin, adenylate cyclase activator, on secretion of IGF-I have not been reported. Therefore, a modified perfused rat liver model was used to investigate the regulatory effects of forskolin on IGF-I secretion in this experiment. The results were summerized as follows : 1. Modified perfused rat liver model was not changed to aspartate aminotransferase(AST), alanine aminotransferase(ALT) and lactic dehydrogenase(LDH) secretion in time. 2. The IGF-I secretion in hepatic cell was increased by forskolin($10^{-5}$, $10^{-6}$ and $10^{-7}M$) in a dose-dependent manner as compared with those of the controls, and significantly increased by $10^{-5}$ and $10^{-6}$ forskolin(p < 0.05). 3. Secretion of glucose in hepatic cell significantly was decreased by $10^{-5}$ forskolin as compared with those of controls(p < 0.05). These results suggest that forskolin may be involved in the regulation of IGF-I secretion in the perfused rat liver.

• Journal of Korean Neurosurgical Society
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• 제29권6호
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• pp.731-737
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• 2000

목 적 : 종양세포의 세포면에서는 성장인자 수용체들이 과발현되고 이들이 성장인자들과 결합함으로서 세포의 성장을 촉진하게 된다. 원발성 악성 뇌종양에 대한 새로운 치료법 중 하나가 면역독소를 사용하는 방법이다. 독소는 대상 세포의 세포면에 있는 수용체를 통해 세포질로 이행되며, 면역독소가 선택적인 항종양작용을 나타내기 위해서는 수용체가 과발현되어야 한다. 강력한 세포독성의 효과가 있음에도 불구하고 면역독소를 환자에 투여하였을 때 종양을 완치시키지는 못하였는데, 면역독소의 효과에 영향을 미치는 여러 인자들에 대한 더 많은 연구가 요구된다. 이러한 연구에 사용되어질 뇌종양세포주들에서 성장인자수용체들의 발현 여부를 알아보기 위해 본 연구를 시행하였다. 대상 및 방법 : 한 개의 수모세포종 세포주(Daoy)와 두 개의 교모세포종 세포주(U373 MG, T98 G)에서, transferrin 수용체, insulin-like growth factor-1 수용체, 그리고 interleukin-4 수용체들의 발현을 flow cytometric analysis를 이용하여 조사하였다. 결 과 : Transferrin 수용체와 interleukin-4 수용체는 Daoy, U373 MG, 그리고 T98 G 모두에서 발현되었다. Insulin-like growth factor-1 수용체는 Daoy와 U373 MG에서는 발현되었지만 T98 G에서는 발현되지 않았다. 결 론 : Transferrin 수용체와 interleukin-4 수용체는 면역독소 치료에 적합한 것으로 보인다. 본 실험의 결과는 상기의 세포주를 사용하여 면역독소와 관련된 실험을 하는데 참고가 되어야하며, 면역독소 치료에 있어서 적절한 면역독소를 선택하는 문제 등 치료 모델을 확립하는데 고려되어야 할 것이다.