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M C

T TM

A C

B D

圖一、TNF-α 合併 MPP+ 處理可加重 MPP+ 的毒性。 PC-12 細胞培 養後分別予下列藥物處理:圖 A:對照組(C);圖 B:30 ng/ml TNF-α

(T);圖 C:150μM MPP+ (M);圖 D:150μM MPP+ 合併 30 ng/ml TNF-α(TM),經處理 24 小時後,在 400 倍視野下以相位差顯微鏡 觀察細胞形態上改變。圖 A 對照組中白色箭頭所指處為神經軸。當 單獨給予 TNF-α 時細胞在形態上與對照組比較沒有明顯差異,白色 箭號所指處為神經軸(圖 B)。而 MPP+ 處理後,細胞開始出現皺縮、

神經軸退化之現象(圖 C)。當 MPP+ 合併加入 30 ng/ml TNF-α 處理 時,細胞死亡的現象更是明顯 (圖 D 黑色箭號所指處)。白色箭號 所指處為神經軸、黑色箭號所指處為貼附性差、死亡、皺縮的細胞或 是漂浮的細胞碎片(scale bar=10μM)。

圖二、不同處理時間點引發細胞形態改變。 培養的 PC-12 細胞給予 各種不同藥物(300μM MPP+ ,30 ng/ml TNF-α 或 300μM MPP+ 合 併 30 ng/ml TNF-α)及不同時間點(1,2,6,12 及 24 小時)處理後 以 400 倍相位差顯微鏡觀察細胞形態上改變。右圖中圖 A:對照組處 理 1 小時(C1);圖 B:TNF-α 處理 1 小時(T1);圖 C:對照組處 理 24 小時(C24);圖 D:TNF-α 處理 24 小時(T24);圖 E:MPP+ 處 理 1 小時(M1);圖 F:TNF-α 合併 MPP+ 處理 1 小時(TM1);圖 G:

MPP+ 處理 2 小時(M2);圖 H:TNF-α 合併 MPP+ 處理 2 小時(TM2); 圖 I:MPP+ 處理 6 小時(M6);圖 J:TNF-α 合併 MPP+ 處理 6 小時

(TM6);圖 K:MPP+ 處理 12 小時(M12);圖 L:TNF-α 合併 MPP+ 處理 12 小時(TM12);圖 M:MPP+ 處理 24 小時(M24);圖 N:TNF-α 合併 MPP+ 處理 24 小時(TM24)。白色箭號所指處為神經軸、黑色 箭號所指處為貼附性差、死亡、皺縮的細胞或是漂浮的細胞碎片(scale bar=10μM)。

C1 T1

C24 T24

A B

C D

M1

M2

TM1

TM2

E F

G H

M6 TM6

M12 TM12

I J

K L

M24 TM24

M N

0

MPP 0 mM MPP0.075 mM MPP0.15 mM MPP0.3 mM MPP0.6 mM

groups

C M

T

A C

B D

TM

圖四、MPP+ 及 TNF-α 合併 MPP+ 處理引發細胞凋亡。 細胞分別給 予以下藥物處理:圖 A:對照組(C);圖 B:30 ng/ml TNF-α(T); 圖 C:150μM MPP+ (M);圖 D:150μM MPP+ 合併 30 ng/ml TNF-α(TM),經處理 24 小時後,以 DAPI 染色並在雷射掃描共軛 焦顯微鏡(laser scanning confocal microscopy)觀察細胞凋亡的結果。

在對照組(圖 A)及 TNF-α 處理(圖 B)的細胞,細胞核完整、沒 有核濃縮的情形。在 MPP+ 處理後(圖 C),細胞出現凋亡的特徵,

例如:細胞核斷裂及核濃縮。而在 MPP+ 及 TNF-α 合併 MPP+ 處理的 細胞 (圖 D),其細胞核斷裂或是濃縮的情況更是明顯。箭號所指處 為斷裂或是濃縮的細胞核。

4H 8H M300 M150 M300 M150 cytochrome-c

β-actin

圖五、MPP+ 處理可引發 cytochrome-

c

的釋放。 上圖係以西方墨點 法偵測 MPP+ 處理後 cytochrome-

c

的表現量。實驗結果顯示 150μM MPP+ 可引發 cytochrome-

c

的釋放,且 8 小時 cytochrome-

c

的表現量多 於 4 小時的表現量。在 300μM MPP+ 處理也看見同樣的趨勢。顯示 MPP+ 的處理可引發 cytochrome-

c

的釋放,此一現象與 Viswanath等人 的實驗結果一致(Viswanath et al., 2001)。M300=300μM MPP+ ;M150

=150μM MPP+ ;4H=藥物處理 4 小時;8H=藥物處理 8 小時。

β-actin

C T1 T2 T24 M2 M6 M12 M24 TM2 TM6 TM12 TM24

32 kD

17 kD

Caspase-3 (cleaved form) Caspase-3

圖六、MPP+ 及MPP+ 合併TNF-α處理可導致caspase-3活化。 PC-12 細胞分別給予藥物處理(30 ng/ml TNF-α、300μM MPP+ 或是給予 30 ng/ml TNF-α合併300μM MPP+ 或對照組)至特定時間點後,收取 細胞蛋白質,以西方墨點法偵測caspase-3的表現量。圖中cleaved caspase-3(17kD)代表活化的caspase-3。實驗顯示TNF-α單獨處理的 細胞並未引起caspase-3活化。而MPP+ 處理的細胞在6小時後,活化的 caspase-3表現量即增加(M6),但此一增加的現象與處理時間的增長 並無明顯關係(M12及M24)。而在TNF-α加MPP+(TM)處理組別,

活化的caspase-3表現量高於MPP+ 單獨處理組別。但是,TM組的cleaved caspase-3的表現量也並未隨著處理時間增加而增加(n=3)。C:對照 組處理24小時;T1:TNF-α處理1小時;T2:TNF-α處理2小時;T24:

TNF-α處理24小時;M2:MPP+ 處理2小時;M6:MPP+ 處理6小時;

M12:MPP+ 處理12小時;M24:MPP+ 處理24小時;TM2:TNF-α合 併MPP+ 處理2小時;TM6:TNF-α合併MPP+ 處理6小時;TM12:TNF-α

C T1 T24 M1 M2 M6 M12 M24 TM1 TM2 TM6 TM12 TM24

JNK

p-JNK

β-actin

圖七、MPP+ 及MPP+ 合併TNF-α處理可導致JNK磷酸化。 PC-12細胞 分別給予不同藥物處理(30 ng/ml TNF-α、300μM MPP+ 或是給予 30 ng/ml TNF-α 合併 300μM MPP+ 或對照組)至不同時間點(1、2、

6、12、24 小時) 後收取細胞蛋白質,並且以西方墨點法偵測 JNK 及磷酸化 JNK(p-JNK)的表現量。圖中顯示 4 次實驗中的一次結果,

JNK、p-JNK 與β-actin 的表現量。由實驗結果顯示,JNK 磷酸化的表 現量,在 TNF-α合併 MPP+ 處理組別(TM1、TM2、TM6、TM12 及 TM24)有增加傾向(n=4)。C:對照組處理 24 小時;T1:TNF-α 處 理 1 小時;T24:TNF-α 處理 24 小時;M1:MPP+ 處理 1 小時;M2:

MPP+ 處理 2 小時;M6:MPP+ 處理 6 小時;M12:MPP+ 處理 12 小時;

M24:MPP+ 處理 24 小時;TM1:TNF-α 合併 MPP+ 處理 1 小時;TM2:

TNF-α 合併 MPP+ 處理 2 小時;TM6:TNF-α 合併 MPP+ 處理 6 小時;

TM12:TNF-α 合併 MPP+ 處理 12 小時;TM24:TNF-α 合併 MPP+ 處 理 24 小時。箭號所指處為 JNK 或 p-JNK 所在之分子量(54kD 及

P-C-Jun

β-actin

C T24 M1 M2 M6 M12 M24 TM1 TM2 TM6 TM12 TM24

圖八、MPP+ 及MPP+ 合併TNF-α處理並不導致c-Jun 磷酸化 (p-c-Jun)

的增加。 培養的PC-12細胞分別給予不同藥物處理(30 ng/ml

TNF-α、300μM MPP+ 或是給予30 ng/ml TNF-α合併300μM MPP+ 或 對照組)至不同時間點(1、2、6、12、24小時)後收取細胞蛋白質,

並且以西方墨點法偵測p-c-Jun的表現量。上圖為四次實驗的結果之 一,結果顯示p-c-Jun表現量並不因為各組藥物處理而增加(n=4)。C:

對照組處理24小時;T24:TNF-α處理24小時;M1:MPP+ 處理1小時;

M2:MPP+ 處理2小時;M6:MPP+ 處理6小時;M12:MPP+ 處理12小 時;M24:MPP+ 處理24小時;TM1:TNF-α合併MPP+ 處理1小時;TM2:

TNF-α合併MPP+ 處理2小時;TM6:TNF-α合併MPP+ 處理6小時;

TM12:TNF-α合併MPP+ 處理12小時;TM24:TNF-α合併MPP+ 處理 24小時。

C T M TM

p-c-Jun

圖九、MPP+ 合併 TNF-α 處理可增加 JNK 活性。 培養的 PC-12 細胞 分別給予不同藥物處理 (30 ng/ml TNF-α、300μM MPP+ 或是給予 30 ng/ml TNF-α 合併 300μM MPP+ 或對照組)至 24 小時後收取細胞 蛋白質,並以自 Cell Signal 購得之 Kinase Assay Kit 分析 p-c-Jun 表現 量用以評估 JNK 的活性。此圖為四次實驗的結果之一。結果顯示 p-c-Jun 表現量在 MPP+ 合併 TNF-α 處理的細胞有增加的趨勢(n=4)。 顯示 JNK 活性因藥物合併處理而上升。C:對照組處理 24 小時;T:

TNF-α 處理 24 小時;M:MPP+ 處理 24 小時;TM:TNF-α 合併 MPP+ 處理 24 小時。

圖十、抑制 caspase 活化可阻止 MPP+ 及 MPP+ 合併 TNF-α 導致的 PC-12

圖十、抑制 caspase 活化可阻止 MPP+ 及 MPP+ 合併 TNF-α 導致的 PC-12

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