小肠干细胞的吸收性和分泌性子代对营养物质的感知
Nutrient sensing by absorptive and secretory progenies of small intestinal stem cells.
作者信息
Kishida Kunihiro, Pearce Sarah C, Yu Shiyan, Gao Nan, Ferraris Ronaldo P
机构信息
Department of Pharmacology, Physiology and Neurosciences, New Jersey Medical School, Rutgers University, Newark, New Jersey; and.
Department of Biological Sciences, Life Science Center, Rutgers University, Newark, New Jersey.
出版信息
Am J Physiol Gastrointest Liver Physiol. 2017 Jun 1;312(6):G592-G605. doi: 10.1152/ajpgi.00416.2016. Epub 2017 Mar 23.
Nutrient sensing triggers responses by the gut-brain axis modulating hormone release, feeding behavior and metabolism that become dysregulated in metabolic syndrome and some cancers. Except for absorptive enterocytes and secretory enteroendocrine cells, the ability of many intestinal cell types to sense nutrients is still unknown; hence we hypothesized that progenitor stem cells (intestinal stem cells, ISC) possess nutrient sensing ability inherited by progenies during differentiation. We directed via modulators of Wnt and Notch signaling differentiation of precursor mouse intestinal crypts into specialized organoids each containing ISC, enterocyte, goblet, or Paneth cells at relative proportions much higher than in situ as determined by mRNA expression and immunocytochemistry of cell type biomarkers. We identified nutrient sensing cell type(s) by increased expression of fructolytic genes in response to a fructose challenge. Organoids comprised primarily of enterocytes, Paneth, or goblet, but not ISC, cells responded specifically to fructose without affecting nonfructolytic genes. Sensing was independent of Wnt and Notch modulators and of glucose concentrations in the medium but required fructose absorption and metabolism. More mature enterocyte- and goblet-enriched organoids exhibited stronger fructose responses. Remarkably, enterocyte organoids, upon forced dedifferentiation to reacquire ISC characteristics, exhibited a markedly extended lifespan and retained fructose sensing ability, mimicking responses of some dedifferentiated cancer cells. Using an innovative approach, we discovered that nutrient sensing is likely repressed in progenitor ISCs then irreversibly derepressed during specification into sensing-competent absorptive or secretory lineages, the surprising capacity of Paneth and goblet cells to detect fructose, and the important role of differentiation in modulating nutrient sensing. Small intestinal stem cells differentiate into several cell types transiently populating the villi. We used specialized organoid cultures each comprised of a single cell type to demonstrate that ) differentiation seems required for nutrient sensing, ) secretory goblet and Paneth cells along with enterocytes sense fructose, suggesting that sensing is acquired after differentiation is triggered but before divergence between absorptive and secretory lineages, and ) forcibly dedifferentiated enterocytes exhibit fructose sensing and lifespan extension.
营养感知通过肠-脑轴触发反应,调节激素释放、摄食行为和新陈代谢,而这些在代谢综合征和某些癌症中会失调。除了吸收性肠上皮细胞和分泌性肠内分泌细胞外,许多肠道细胞类型感知营养的能力仍不为人知;因此,我们推测祖细胞干细胞(肠道干细胞,ISC)具有在分化过程中传递给后代的营养感知能力。我们通过Wnt和Notch信号通路的调节剂,将小鼠肠道隐窝前体细胞定向分化为特殊的类器官,每个类器官都含有ISC、肠上皮细胞、杯状细胞或潘氏细胞,其相对比例远高于原位,这是通过细胞类型生物标志物的mRNA表达和免疫细胞化学确定的。我们通过果糖刺激后糖酵解基因表达的增加来鉴定营养感知细胞类型。主要由肠上皮细胞、潘氏细胞或杯状细胞而非ISC细胞组成的类器官对果糖有特异性反应,而不影响非糖酵解基因。这种感知独立于Wnt和Notch调节剂以及培养基中的葡萄糖浓度,但需要果糖吸收和代谢。更成熟的富含肠上皮细胞和杯状细胞的类器官对果糖的反应更强。值得注意的是,肠上皮细胞类器官在被迫去分化以重新获得ISC特征后,表现出明显延长的寿命并保留果糖感知能力,类似于一些去分化癌细胞的反应。通过一种创新方法,我们发现营养感知在祖细胞ISC中可能受到抑制,然后在分化为有感知能力的吸收性或分泌性谱系的过程中不可逆地去抑制,潘氏细胞和杯状细胞检测果糖的惊人能力,以及分化在调节营养感知中的重要作用。小肠干细胞分化为几种短暂填充绒毛的细胞类型。我们使用每种由单一细胞类型组成的特殊类器官培养物来证明:(1)营养感知似乎需要分化;(2)分泌性杯状细胞、潘氏细胞以及肠上皮细胞能感知果糖,这表明感知是在分化触发后但在吸收性和分泌性谱系分化之前获得的;(3)被迫去分化的肠上皮细胞表现出果糖感知和寿命延长。
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