甲基马龙酸血症的脂质变化与FGF21升高和异常的甲基马龙化相关
Irini Manoli1, Justin R Sysol1, PamelaSara E Head1
1Metabolic Medicine Branch, National Human Genome Research Institute.
JCI insight
|January 25, 2024
概括
甲基马龙酸性血 (MMA) 导致独特的脂肪分布,类似于脂质营养不良. 小分子治疗在小鼠中诱导了有益的脂肪"beiging",这表明MMA患者的潜在治疗策略.
科学领域:
- 生物化学 生物化学
- 代谢障碍 代谢障碍 代谢障碍
- 脂肪组织生物学 脂肪组织生物学
背景情况:
- 甲基马洛尼尔-CoA突变酶 (MCM) 缺乏,或甲基马洛尼尔酸血症 (MMA),是分支链氨基酸 (BCAA) 代谢的先天性错误.
- 患有MMA的患者表现出不寻常的脂肪组织分布:心向型肥胖,四肢脂肪积累和最小的内脏脂肪,模仿家族多重脂质瘤.
研究的目的:
- 在甲基马龙酸血症 (MMA) 中研究棕色和白色脂肪组织的生理学.
- 探索纤维细胞生长因子21 (FGF21),乙-CoA积累和MMA中的炎症之间的关系.
- 在MMA小鼠模型中评估贝扎菲布拉特的治疗潜力.
主要方法:
- 分析了46名MMA患者和99名对照者的身体组成,脂蛋白和炎症标志物.
- 在肝脏特异性转基因MMA小鼠模型 (Mmut-/- TgINS-Alb-Mmut) 中研究了脂肪组织和发热.
- 用贝扎菲布拉特治疗MMA小鼠,以评估临床和代谢变化.
主要成果:
- 在MMA患者中,表现出明显的脂质变现象型.
- FGF21水平与乙-CoA积累,脂肪组织甲基化和减少炎症相关.
- MMA小鼠显示热生成受损,白色的棕色脂肪和对寒冷的反应不佳,这与贝扎菲布拉特治疗有所改善,包括皮下脂肪.
结论:
- 在BCAA氧化中的缺陷导致MMA的新型脂质变现象.
- 在MMA中,皮下脂肪组织的加热可以通过小分子诱导,从而呈现出潜在的治疗途径.
更多相关视频
09:40Phosphorus-31 Magnetic Resonance Spectroscopy: A Tool for Measuring In Vivo Mitochondrial Oxidative Phosphorylation Capacity in Human Skeletal Muscle
Published on: January 19, 2017
11.7K
06:52Behavioral and Locomotor Measurements Using an Open Field Activity Monitoring System for Skeletal Muscle Diseases
Published on: September 29, 2014
53.7K
相关概念视频
Inborn Errors of Metabolism
160
Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
160
Overview of Lipid Metabolism
1.6K
Lipid metabolism is a crucial process in the human body that involves the synthesis and degradation of lipids. This process is essential for energy production, cell membrane formation, and hormone production, among other functions.
Lipolysis: The Breakdown of Lipids:
Lipolysis is the process of breaking down lipids, particularly triglycerides, into glycerol and fatty acids. This process typically occurs in the adipose tissue and is triggered by various hormones, including glucagon and...
Lipolysis: The Breakdown of Lipids:
Lipolysis is the process of breaking down lipids, particularly triglycerides, into glycerol and fatty acids. This process typically occurs in the adipose tissue and is triggered by various hormones, including glucagon and...
1.6K
Lysosomal Hydrolases
3.8K
Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
3.8K
Abnormal Proliferation
4.5K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.5K
Satellite Stem Cells and Muscular Dystrophy
2.0K
Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
2.0K
