1-Methylnicotinamide stimulates cell growth and inhibits hemoglobin synthesis in differentiating murine erythroleukemia cells.

1-Methylnicotinamide stimulates cell growth and inhibits hemoglobin synthesis in differentiating murine erythroleukemia cells.
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1-Mmethylnicotinamide 在分化小鼠红白血病细胞中刺激细胞生长并抑制血红蛋白合成。

DOI:
10.1016/j.tiv.2007.05.017
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发表时间:
2007
期刊:
Toxicology in vitro : an international journal published in association with BIBRA
影响因子:
--
通讯作者:
Kinder,David
Kinder,David
中科院分区:
--
文献类型:
--
作者:
Kuykendall,JimR;Cox,Ray;Kinder,David

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将小鼠红白血病细胞(MELC)暴露于烟酰胺(NA)或其合成类似物N′-甲基烟酰胺(N′-MN)可降低细胞生长并诱导终末分化,其特征为血红素和珠蛋白积累增加。相反,1-甲基烟酰胺(1-MN),过量NA的主要代谢产物,被发现刺激细胞生长,减少培养的MELC的自发分化。当用2.5mM 1-MN培养长达96小时时,对数期MELC表现出比未处理细胞高50%的细胞密度。当在培养的MELC中与NA或几种化学上不相关的血红蛋白合成诱导剂组合时,1-MN使珠蛋白mRNA水平和血红素积累降低40- 80%。1-MN能够抑制血红素的产生,如果存在的话,仅在NA暴露后的前24- 48小时。用1-MN预处理不能赋予细胞对NA作用的抗性,表明抑制是可逆的。最有效的诱导剂5 mM N '-MN在半固体培养基中的分化被2.5 mM浓度的1-MN抑制高达95%。与暴露于NA或N′-MN的MELC培养物相比,1-MN似乎对生长和分化诱导具有相反的作用。
Exposure of murine erythroleukemia cells (MELCs) to nicotinamide (NA) or its synthetic analog N′-methylnicotinamide (N′-MN) reduces cell growth and induces terminal differentiation, marked by increased heme and globin accumulation. On the contrary, 1-methylnicotinamide (1-MN), the primary metabolite of excess NA, was found to stimulate cell growth and reduce spontaneous differentiation of cultured MELCs. Log phase MELCs exhibited up to 50% higher cell density above untreated cells when cultured for up to 96h with 2.5mM 1-MN. When combined with NA or several chemically-unrelated inducers of hemoglobin synthesis in cultured MELCs, 1-MN reduced the globin mRNA levels and heme accumulation by 40–80%. 1-MN was able to inhibit heme production if present during only the first 24–48h after NA exposure. Pre-treatment with 1-MN could not confer resistance of cells to effects of NA, suggesting the inhibition is reversible. Commitment to differentiate in semisolid medium by the most potent inducer, 5mM N′-MN, was inhibited up to 95% by 2.5mM concentrations of 1-MN. It appears that 1-MN has opposing effects on growth and induction of differentiation than those seen in MELC cultures exposed to NA or N′-MN.
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