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2.5 小鼠胃癌模型探究 PTPN6 对肿瘤生长和 NK 建立皮下移植瘤模型。结果显示,在 NCG 小鼠中,
细胞浸润的调控作用 PTPN6过表达对肿瘤生长无显著影响(图5B);而在
本研究进一步在小鼠胃癌细胞系 YTN16 中构 C57BL/6 小鼠中,PTPN6 的过表达显著促进了肿瘤
建了 PTPN6 稳定过表达细胞株(图 5A),并在 NCG 生长(图5C),提示PTPN6可能通过免疫调节机制促
鼠(免疫缺陷鼠)和C57BL/6鼠(免疫正常鼠)中分别 进肿瘤进展。流式细胞术检测小鼠肿瘤组织中NK
A 100 * B BF HE CK7 staining C GTO1
(%) 80 1.00 27
NK cytotoxicity 60 GTO1 Proportions 0.75 39 False
True
40
0.50
20
0 50 μm 50 μm 50 μm 0.25 73 61
siPTPN6⁃1
siNC 0.00
GTO2 Organoid Tissue
50 μm 50 μm 50 μm
D E F
1.00 100 Tissue
4
20 20 3
0.75 32 (%) 75 2 1
Exposures 0.50 36 Mutations 50 -1 0
-2
25
33 29 4 Organoid
0.25
0 3
Ti Tv Organoid Tissue 2
14 16
0 C>T T>A 1
0
Organoid Tissue T>C C>G -1
SBS1(Age) SBS15(Mismatch repair) C>A T>G -2
SBS5(Age) SBS20(Mismatch repair) 1 2 3 4 5 6 7 8 9101112 14 161820 X
G H I
On matrigel Matrigel GTO1 60 *
NK⁃92⁃MI NC OE (%)
Organoids PTPN6 68 kDa 40
Pre Post β⁃actin 42 kDa NK cytotoxicity 20
GCOs 0 NC PTPN6⁃OE
0∶00 4∶00
GCOs+NK92MI
0∶00
4∶00
A:Cytotoxic activity of NK cells against MKN1 cells was analyzed by flow cytometry(n=3). B:Bright⁃field images,HE staining,and CK7 staining
of gastric cancer organoids,scale bar=50 μm. C-F:Whole⁃exome sequencing(WES)was performed to compare the genomic alterations between the gas⁃
tric cancer organoid GTO1 and its parental tumor tissue. The analysis included the following:the proportion of shared mutations(C),mutational signa⁃
tures(D),transition and transversion(E),and copy number alterations(F). G:Schematic diagram of the co⁃culture model of organoids and NK92MI
cells. Red arrows indicate successfully lysed organoids(scale bar=200 μm). H:The protein level of PTPN6 in GTO1 was detected by Western blot. I:
*
Cytotoxic activity of NK cells against gastric cancer organoid GTO1 was analyzed by flow cytometry(n=3). P < 0.05.
图4 过表达PTPN6抑制胃癌细胞和胃癌类器官对NK细胞杀伤的敏感性
Figure 4 Overexpression of PTPN6 inhibited the sensitivity of MKN1 cells and gastric cancer organoids to NK cell⁃mediated
killing

