ObjectiveTo investigate the expression of epidermal growth factor receptor (EGFR) in triple-negative breast cancer (TNBC) and its relation with clinicopathologic features. MethodsA computer search of PubMed, Web of Science, CNKI, Wanfang Data, and VIP databases were conducted to select clinical studies on EGFR expression in the TNBC according to the inclusion and exclusion criteria, and the search period was from database establishment to January 2022. Two researchers independently screened the literature, extracted the data, and evaluated the quality of the literature before conducting meta-analysis using RevMan 5.4 software. ResultsA total of 28 studies including 7 956 patients were included. The results of meta-analysis showed that the positive rate of EGFR expression in the TNBC patients was higher than that in the non-TNBC patients [OR=5.16, 95%CI (4.04, 6.58), P<0.000 01], and the proportions of patients with axillary lymph node metastasis [OR=3.11, 95%CI (1.56, 6.19), P=0.001] and with tumor diameter >2 cm [OR=2.09, 95%CI (1.18, 3.72), P=0.01] in the patients with EGFR positive were higher than those the patients with EGFR negative, no correlation was found that the proportion of patients with histological WHO classification 3 between the patients with EGFR positive expression and EGFR negative expression (P=0.07). ConclusionFrom the results of this meta-analysis, EGFR expression might be associated with the occurrence, development, and metastasis of patients with TNBC.
In thiis study,we show thai carbachol stimulates the accumulation of inositol phosphates(InsPs)in human rellnal pigment epithelium (RPE)cells and atropine blocks the carbachol-induced effect ,suggesting the existence of musearinie acelyleholine receptors in human RPE cells. In contrast,noradrenaline,serotonin, cpidermal growth factor (EGF),isoproterenol,and NECA (5'-[N-ethyl]-carboxamido-adenosine)do not influence the basal levels of InsPs.Moreover,isoprmerenol and NECA do not affect the carhaehol elevated levels of InsPs.EGF,howcvcr,does potentiate the carhaehol stimulated elevation of InsPs in a dose-dependent manner ,suggesting an interaction between EGF and musearinie receptors in cultured human RPE cells. （Chin J Ocul Fundus Dis,1994,10:220-222）
Porpose To investigate the optimal concentration of epidermal growth factor (EGF) and basic fibroblast growth factor (bFGF) on DNA synthesis and their synergism indensity arrested human retinal pigment epithelial (RPE) cells. Methods Growth factor effects in cultured human RPE of the 6th generation were assessed by [3 H]-thymidine incorporation and radioautography. Results EGF and bFGF were potent stimulators when used alone,and their optimal concentrations were 10ng/ml in DMEM and 1ng/ml in 2% serum DMEM.When used in combination (10ng/ml EGF and 10ng/ml bFGF),they caused a significant enhancement of [3 H]-thymidine incorporation about 2.96 times. Conclusion EGF and bFGF were potent stimulators in RPE cells,and demonstrated synergism in their action. (Chin J Ocul Fundus Dis,1998,14:98-100)
OBJECTIVE: To investigate the efficiency of recombinant human epidermal growth factor (rhEGF) on burn wound healing and to explore the effective density of the ointments. METHODS: A total of 120 cases of burn in superficial II degree and profound II degree were randomly divided into 2 groups. In the first group of 15 cases of superficial II degree, the wounds were treated by rhEGF ointments of different density, 0.5 microgram/g, 10 micrograms/g and 50 micrograms/g, to screen out the effective density. And in the other 105 cases of the second group, optimal density of the ointments based on the result of the first group were employed to treat the burn wound in superficial II degree and profound II degree, with the self-corresponding wounds of the same degree as control, to study the efficiency of rhEGF on wound healing, according to the wound healing time, and adverse reaction of the ointment. RESULTS: In the first group, the average healing time of superficial II wound treated by ointments of 10 micrograms/g and 50 micrograms/g significantly shortened when compared with that treated by ointments of 0.5 microgram/g(P lt; 0.01), but there was no obvious difference between the cases treated by ointments of 10 micrograms/g and 50 micrograms/g. In the second group, the healing time of superficial II wound treated by ointments of 10 micrograms/g was (8.39 +/- 2.25) days, (9.52 +/- 2.56) days in the control (P lt; 0.01); and healing time of profound II burn treated by ointments of 10 micrograms/g was (16.80 +/- 2.99) days, (18.27 +/- 3.17) days in the control (P lt; 0.01). And healing rates of burn wound at different periods were higher than those of the control. CONCLUSION: The above results indicate that rhEGF ointments can enhance burn wound healing significantly, and the ointment of 10 micrograms/g is a good choice for clinical application.
【摘要】目的探讨生长抑素(somatostatin,SS)和表皮生长因子(epidermal growth factor,EGF)在银屑病治疗中的相互作用机制。方法选择2008年1月12月门诊和住院的寻常型银屑病患者68例,用放射免疫法检测正常组织和各期银屑病皮损中SS和EGF的表达。结果进行期银屑病皮损中EGF明显高于静止期、恢复期皮损和正常皮肤(P＜001);各期银屑病皮损与正常皮肤中SS差异无统计学意义(P＜005)。结论SS可能是通过抑制EGF而在银屑病的治疗中起关键作用。
Objective To observe the effect of epidermal growth factor (EGF) on the proliferation, adhesion, invasiveness and the activation of nuclear factor-κB (NF-κB), matrix metalloproteinases (MMPs) expression and explore related mechanisms in pancreatic cancer cells. Methods Cell invasion assay, proliferation assay and adhesion assay were used to examine the proliferation, adhesion and invasiveness of pancreatic cancer cells, respectively. NF-κB activity was detected by electrophoretic mobility shift assay (EMSA), and MMPs protein and mRNA expressions were investigated by gelatin zymography, Western blot and reverse transcriptase-polymerase chain reaction (RT-PCR). Results EGF increased the invasiveness of pancreatic cancer cell in a dose-dependent manner (P＜0.05), but did not affect cell proliferation or adhesion. The expressions of MMP-9 mRNA and protein significantly increased after induction by EGF and were highest when EGF concentration was 50 ng/ml, while there was no effect on the expressions of MMP-2 mRNA and protein. Furthermore, NF-κB activity increased with increased concentration of EGF in a concentration-dependent manner (P＜0.05). In addition, NF-κB activity and the expressions of MMP-9 mRNA and protein by pretreatment with both pyrrolidine dithiocarbamate (PDTC) and EGF decreased when compared that by pretreatment with EGF alone. The invasiveness of pancreatic cancer cell by pretreatment with both PDTC and EGF decreased when compared that by pretreatment with EGF alone and nothing (P＜0.05).Conclusion The findings indicate that the NF-κB-mediated MMP-9 induction is essential for EGF-induced invasiveness in pancreatic cancer cells, which can be inhibited by PDTC.
ObjectiveTo evaluate the effect of heparin binding epidermal growth factor-like growth factor (HB-EGF) on liver regeneration after partial orthotopic liver transplantation. MethodsFourty SD rats were used to establish the model of partial orthotopic liver transplantation with ameliorated two-cuff technique. Then all the rats were divided into 2 groups: experiment group and control group. Twenty rats of experiment group were administered 500 μg/kg HBEGF via vena caudalis immediately after operation twice a day, while the same volume of saline was administered to the rats in control group. Five rats in each group were selected randomly and killed at the 6th hour, day 2, 4 and 7 after operation, respectively. The serum levels of albumin (Alb) and alanine aminotransferase (ALT) in the blood sample were detected. Every liver was removed and weighed. The expression of Ki67 was detected by using immunohistochemistry assay. The regeneration activity of hepatocytes was evaluated by flow cytometry. ResultsThe wet weights of liver in experiment group were all significantly higher than that in control group at the 6th hour, day 2 and 4 after transplantation (P＜0.05). The serum levels of ALT were significantly lower in experiment group than those in control group at the 6th hour, day 2， 4, 7 after operation (P＜0.05), while the levels of Alb were significantly higher on day 4 and 7. The proliferating index and Ki-67 labeling index of graft in experiment group were higher than those in control group on day 2 and 4 after transplantation （2 d: P＜0.01; 4 d: P＜0.05）. ConclusionHBEGF could promote the regeneration of rat hepatocytes after partial liver transplantation.
Objective To investigate the feasibility of detection of epidermal growth factor receptor ( EGFR) exon 19 deletions and exon 21 L858R mutations in pleural effusion fromnon-small-cell lung cancer ( NSCLC) patients by mutant enriched PCR assay. Methods The mutations of exon 19 and 21 of EGFR gene in pleural samples fromthirty NSCLC patients were analyzed using both the mutant-enriched PCR assay and the non-enriched PCR assay. Results Ten ( 33. 3% , 10/ 30) exon 19 deletions and five ( 16. 7% , 5/30) exon 21 L858R mutation were detected by the mutant-enriched PCR assay, while only 6 cases ( 20. 0% ) and 1 case ( 3. 3% ) were detected by the non-enriched PCR assay respectively. The difference of mutation detection rate of EGFR gene between the two methods was statistically significant ( P = 0. 032) . Mutations were detected in all of partial responders ( 2 /4) among the four patients who received gefitinib therapy. Conclusions Mutant-enriched PCR assay can detect EGFR exon 19 deletions and exon 21 L858R mutation in pleural effusion from NSCLC patients effectively, economically and accurately. It may be a valuable biomarker for gefitinib therapy in advanced NSCLC.
ObjectiveTo observe the effects of different concentrations of trastuzumab alone or in combination with oxaliplatin on proliferation, apoptosis, and cell cycle of SW-620 human colon cancer cell, and to explore its mechanism. MethodsSW-620 human colon cancer cells were cultured in vitro. ① Cell proliferation experiment: the cells were divided into two large groups: trastuzumab group and trastuzumab combined with oxaliplatin group. There were eight concentration groups in each large group (five holes for each group). The concentration of the trastuzumab group was 0, 0.001, 0.01, 0.1, 1, 10, 100, and 1 000 μg/mL, corresponding to the trastuzumab combined with oxaliplatin group. The concentration of the antibiotic was the same as before, except that oxaliplatin (10 μmol/L) was added. The absorbance (A) value of each group was measured by CCK-8 method. ② Apoptosis experiment: the same proliferation experiment was performed in the group, except that the concentrations of trastuzumab only included 0, 0.1, 1 and 10 μg/mL. Flow cytometry was used to detect the proportion of apoptotic cells and cell cycle distribution in each group. ③ Determination of human epidermalgrowth factor receptor-2 (her-2). The SW-620 cells were divided into two large groups, the concentration of trastuzumab group concluded 0, 100, and 1 000 μg/mL, as well as the concentration of trastuzumab in the trastuzumab combined with oxaliplatin group concluded 0, 1, and 10 μg/mL. Expressions of her-2 protein in SW-620 cells were detected by Western blot method. Results① Cell proliferation assay: the A values at100 μg/mL and 1 000 μg/mL were significantly lower than that at 0 μg/mL (P<0.05). At the same concentration, the A value of the trastuzumab combined with oxaliplatin group was lower than that of the trastuzumab group (P<0.05 ), and the A value gradually decreased with the increase of the concentration of trastuzumab. ② Apoptosis experiment: the proportion of apoptotic cells in the trastuzumab combined with oxaliplatin group was higher than that in the trastuzumab group (P<0.05) at the same concentration of trastuzumab. Flow cytometry: after treatment with different concentrations of trastuzumab combined with oxaliplatin, cells in G1 phase showed a downward trend, and cells in S phase showed an upward trend in a dose-dependent manner. At 1 and 10 μg/mL concentration of trastuzumab, the trastuzumab combined with oxaliplatin group significantly reduced the proportion of cells in the G1 phase of SW-620 cell cycle compared with the trastuzumab group, but S phase ratio was higher (P<0.05). The proportion of G2 phase cells was significantly higher in the trastuzumab combined with oxaliplatin group than the trastuzumab group at 0.1, 1 and 10 μg/mL concentrations of trastuzumab (P<0.01). ③ Expressions of her-2 protein: the expression level of her-2 protein gradually decreased at 1, 100, and 1 000 μg/mL trastuzumab group (P<0.05). The expression levels of her-2 protein in 0, 1 and 10 μg/mL trastuzumab combined with oxaliplatin group also gradually decreased (P<0.01). ConclusionsHigh concentration of trastuzumab can inhibit the proliferation of SW-620 human colon cancer cells and induce apoptosis. Trastuzumab combined with oxaliplatin has synergistic effect on inhibiting cell proliferation and promoting apoptosis.