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Adipose tissue macrophages in non-rodent mammals: a comparative study

机译:非啮齿类哺乳动物的脂肪组织巨噬细胞:一项比较研究

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The stromal vascular fraction (SVF) of adipose tissue in rodents and primates contains mesenchymal stem cells and immune cells. SVF cells have complex metabolic, immune and endocrine functions with biomedical impact. However, in other mammals, the amount of data on SVF stem cells is negligible and whether the SVF hosts immune cells is unknown. In this study, we show that the SVF is rich in immune cells, with a dominance of adipose tissue macrophages (ATMs) in cattle (Bos primigenius taurus), domestic goat (Capra aegagrus hircus), domestic sheep (Ovis aries), domestic cat (Felis catus) and domestic dog (Canis familiaris). ATMs of these species are granulated lysosome-rich cells with lamellipodial protrusions and express the lysosome markers acid phosphatase 5 (ACP-5) and Mac-3/Lamp-2. Using ACP-5 and Mac-3/Lamp-2 as markers, we additionally detected ATMs in other species, such as the domestic horse (Equus ferus caballus), wild boar (Sus scrofa) and red fox (Vulpes vulpes). Feline and canine ATMs also express the murine macrophage marker F4/80 antigen. In the lean condition, the alternative macrophage activation marker CD206 is expressed by feline and canine ATMs and arginase-1 by feline ATMs. Obesity is associated with interleukin-6 and interferon gamma expression and with overt tyrosine nitration in both feline and canine ATMs. This resembles the obesity-induced phenotype switch of murine and human ATMs. Thus, we show, for the first time, that the presence of ATMs is a general trait of mammals. The interaction between the adipose cells and SVF immune cells might be evolutionarily conserved among mammals.
机译:啮齿动物和灵长类动物脂肪组织的基质血管部分(SVF)包含间充质干细胞和免疫细胞。 SVF细胞具有复杂的代谢,免疫和内分泌功能,并具有生物医学影响。然而,在其他哺乳动物中,SVF干细胞的数据量可以忽略不计,并且SVF是否宿主免疫细胞尚不清楚。在这项研究中,我们显示SVF富含免疫细胞,在牛(Bos primigenius taurus),家山羊(Capra aegagrus hircus),家绵羊(Ovis aries),家猫的脂肪组织巨噬细胞(ATM)中占优势(Felis catus)和家养犬(Canis熟悉)。这些物种的ATM是粒状富含溶酶体的细胞,具有片状脂质体突起,并表达溶酶体标记酸性磷酸酶5(ACP-5)和Mac-3 / Lamp-2。使用ACP-5和Mac-3 / Lamp-2作为标记,我们还检测了其他物种的ATM,例如家养马(Equus ferus caballus),野猪(Sus scrofa)和赤狐(Vulpes vulpes)。猫和犬ATM也表达鼠巨噬细胞标记F4 / 80抗原。在稀薄条件下,备选的巨噬细胞激活标记CD206由猫和犬ATM表达,而精氨酸酶-1由猫ATM表达。肥胖与猫和犬ATM中的白细胞介素6和干扰素γ表达以及酪氨酸硝化作用有关。这类似于肥胖引起的鼠类和人类ATM的表型转换。因此,我们首次证明了ATM的存在是哺乳动物的普遍特征。脂肪细胞和SVF免疫细胞之间的相互作用在哺乳动物之间可能是进化保守的。

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