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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
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