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第44卷第10期 彭明玉,刘倩颖,沈丹丹,等. 瘦素激活PI3K/AKT信号促进小鼠心肌细胞衰老的初步研究[J].
2024年10月 南京医科大学学报(自然科学版),2024,44(10):1337-1343 ·1341 ·
A 4 20 ** **
** ** 15
mRNA level 2 p21 mRNA level 10
3
p16 1 5
0 0
DMSO Leptin Leptin+ DMSO Leptin Leptin+
LY294002 LY294002
B
DMSO + - + 2.0 ** ** 1.0 ** * 0.8 * **
p16/β⁃actin 1.0 p21/β⁃actin γ⁃H2AX/β⁃actin 0.4
Leptin - + + 1.5 0.8 0.6
0.6
LY294002 - - + 0.4
p16 16 kDa 0.5 0.2 0.2
0 0 0
p21 21 kDa
DMSO Leptin DMSO Leptin DMSO Leptin
γ⁃H2AX 17 kDa Leptin+LY294002 Leptin+LY294002 Leptin+LY294002
β⁃actin 42 kDa
C
β⁃Gal positive cells count 100
DMSO Leptin Leptin+LY294002 150 ** **
50
100 μm 100 μm 100 μm 0 DMSO Leptin Leptin+
LY294002
A:After LY294002 treatment of MCM cells,mRNA levels of p16 and p21 were examined by qPCR. B:The protein expression of p16,p21,and
γ⁃H2AX was examined after LY294002 pretreated MCM. C:The effect of LY294002 on MCM senescence was observed by β⁃Gal staining. P < 0.05,
*
**
P < 0.01(n=3).
图3 瘦素通过PI3K/AKT信号通路调控小鼠心肌细胞衰老
Figure 3 Leptin regulated the process of MCM cells senescence via PI3K/AKT signaling pathway
A B C D
** ** 2.5 ** * 4 ** *
2.5
1.5
mRNA level 2.0 mRNA level 1.0 mRNA level 2.0 mRNA level 3 2
**
**
1.5
1.5
1.0
1.0
IL⁃1β 0.5 0 TNF⁃α 0.5 0 MCP⁃1 0.5 0 IL⁃6 1 0
DMSO Leptin DMSO Leptin DMSO Leptin DMSO Leptin
Leptin+LY294002 Leptin+LY294002 Leptin+LY294002 Leptin+LY294002
The mRNA levels of senescence related SASP(A:IL⁃1β;B:TNF⁃α;C:MCP⁃1;D:IL⁃6)in MCM treated with leptin and LY294002 were
*
**
examined by qPCR. P < 0.05,P < 0.01(n=3).
图4 瘦素促进小鼠心肌细胞细胞分泌SASP
Figure 4 Leptin promoted MCM cells to secrete SASP
细胞可塑性和重编程 。 分布广泛,主要分布在下丘脑、胰岛细胞、肝、肾、
[22]
瘦素是一种含 167 个氨基酸的肽激素,主要由 肺、骨骼肌和骨髓中,与其受体结合可诱导不同信
脂肪细胞产生,亦可由胃、骨骼组织和胎盘少量产 号通路的激活,包括Janus 激酶(Janus kinase,JAK)/
生,其主要作用是通过中枢神经系统刺激能量消 信号转导及转录激活因子(signal transduction and
耗,降低食欲。瘦素分泌量及其循环水平主要受胰 activator of transcription,STAT)通路、丝裂原活化蛋
岛素、糖皮质激素和儿茶酚胺的调节 [23] 。瘦素受体 白激酶(mitogen⁃activated protein kinase,MAPK)和