シンデカン-1のトランス遺伝子発現は,シンデカン-3による栄養行動の生理学的制御を明らかにする
1Division of Newborn Medicine, Department of Pediatrics and Cell Biology, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA. oreizes@go.com
Cell
|July 20, 2001
まとめ
視床下部のシンデカン-1とシンデカン-3は,食事の行動と肥満に影響を与えます. 振動するシンデカン-3レベルは生理的に栄養を調節し,エネルギーバランスに影響を与えます.
科学分野:
- 神経内分泌学の神経内分泌学
- メタボリック・レギュレーション
- 細胞生物学 細胞生物学
背景:
- シンデカン,細胞表面ヘパラン硫酸プロテオグリカン,リガンド受容体相互作用を調節する.
- アルファメラノサイト刺激ホルモン (alphaMSH) の作用の低下は,過食症と肥満に関連しています.
- シンデカン-1とシンデカン-3は,代謝調節に役割を果たします.
研究 の 目的:
- 視床下部の栄養調節におけるシンデカン-1とシンデカン-3の役割を調査する.
- シンデカンの発現がエネルギーバランスと肥満に及ぼす生理学的影響を決定する.
- シンデカンが餌の行動を調節するメカニズムを探求する.
主な方法:
- 視床下部でシンデカン-1を発現するトランスジェニックマウスモデル.
- シンデカン-3 ゼロマウスの生成と分析.
- 遺伝子改変と食物欠乏への反応として,食事の行動 (過食) と体重の変化の評価.
主要な成果:
- トランスジェニックのシンデカン-1発現は,アルファMSH信号の減少を模倣して,過食症と肥満を誘発した.
- ヒポタラミのシンデカン-3濃度は,野生型のマウスの食物欠乏時に有意に増加した.
- シンデカン-3の無値マウスは,食物欠乏に対する鈍化したハイパーファギック反応を示した.
結論:
- 視床下部シンデカン-1とシンデカン-3は,食事行動とエネルギーホメオスタシスの主要な調節体です.
- シンデカン-3のレベルは生理学的に振動し,特に断食中に,食事反応を調節します.
- これらの発見は,肥満介入の潜在的なターゲットとしてシンデカンを示唆しています.
関連する概念動画
Transgenic Organisms
Overview
Transgenic Organisms
Overview
Reporter Genes
Reporter genes are a type of protein-coding gene that are often tagged to a gene of interest. Once inside a target cell, reporter genes usually produce visually identifiable characteristics like fluorescence and luminescence when expressed along with the gene of interest. Thus, reporter genes “report” the presence or absence of genes of interest in an organism, determine the gene expression pattern, or track the physical location of a DNA segment or protein in the cell.
Commonly used reporter...
Commonly used reporter...
Transgenic Plants
Recombinant DNA technology called transgenesis is often used to add a foreign gene or remove a detrimental gene from an organism. Such genetically modified organisms are called transgenic organisms.
The first-ever transgenic plant was a tobacco plant developed in 1983 that showed resistance against the tobacco mosaic virus. Since then, many transgenic plants have been developed and commercialized for improving the agricultural, ornamental, and horticultural value of a crop plant. Transgenic...
The first-ever transgenic plant was a tobacco plant developed in 1983 that showed resistance against the tobacco mosaic virus. Since then, many transgenic plants have been developed and commercialized for improving the agricultural, ornamental, and horticultural value of a crop plant. Transgenic...
GPCRs Regulate Adenylyl Cylase Activity
Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
Two...
Two...
Constitutive and Regulated Gene Expression
Gene expression in prokaryotes is governed by constitutive and regulated systems, allowing cells to balance the production of essential proteins with adaptive responses to environmental changes.Constitutive Gene ExpressionConstitutive, or housekeeping, genes are continuously expressed as they encode proteins vital for fundamental cellular processes. These include enzymes for glycolysis, ribosomal components for protein synthesis, and proteins involved in DNA replication. Their constant...


