Effect of substance P released from peripheral nerve ending on endogenous expression of epidermal growth factor and its receptor in wound healing

Objective: To explore the relationship between substance P (SP) released from peripheral nerve endings and the expression of epidermal growth factor (EGF) and epidermal growth factor receptor (EGFR) during wound bealing. Methods: Fifty Wistar rats were randomly divided into 2 groups, injury group and capsaicin group. In the injury group, a full-thickness skin wound on the back of the rat was taken. The wound edge and granulation tissues were taken on the 1st, 3rd, 6th, 9th, 12th days after injury, respectively. In the capsaicin group, capsaicin was injected subcutaneously on the back of the rats to destroy the sensory nerve to prevent the secretion of SP, then a wound and sample was made in the same way.Immunohistochemistry and in situ hybridization were employed to detect the expression of SP, EGF/EGFR, and EGF mRNA/EGFR mRNA in the granulation tissues.Results: In the injury group,immunohistochemical stain of SP and EGF/EGFR was located on the hair follicles and sebaceous glands at the 1st day. And the stain of SP was obvious at the 3rd day in the granulation tissues, then decreased gradually. EGF/EGFR was at low level at the 3rd day, then increased gradually and reached the peak at the 9th day, then declined. In the capsaicin group, the stain of SP and EGF/EGFR was faint and without obvious change during the wound healing process. The tendency of the EGF mRNA/EGFR mRNA expression was similar to that of EGF/EGFR. Conclusions: During wound healing, SP may promote the healing process by affecting the expression of EGF/EGFR in the erunuation tissues.     

The correlation between serum epidermal growth factor/testicular epidermal growth factor receptor and spermatogenesis in rat

<正>Objective: To investigate the correlation between epidermal growth factor (EGF)/testicular epidermal growth factor receptor (EGF-R) and spermatogenesis in rat. Methods: Forty mature male Spraque-Dauley (SD) rats were randomly assigned to four groups, ten rats in each: sham operation group (SOG), sialoadenectomy group(SG), sialoade-nectomy group with injection of EGF (0. 25 μg·kg-1·d-1, SG-EGF Ⅰ) and sialoadenectomy group with injection of EGF (0. 50 μg·kg-1·d-1 , SG-EGF Ⅱ). The rats were routinely feed, and blood and testes were obtained on the 48th day after the operation. Serum EGF concentrations were determined by radioimmunoassay (RIA) , expression of EGF-R in testes was examined by the immunohistochemical method, and the spermatogenesis was pathologically checked. Results: Serum EGF levels in SG-EGFIand SG decreased significantly when compared with those of SOG (P<0. 05 and P< 0. 01, respectively). The testicular function of spermatogenesis showed a moderate to severe impairment in SG. The expression of EGF-R in Leydig cells decreased in SG(P<0. 05). The two dosage groups of EGF replacement had different effects. There were no significant differences of EGF-R expression in testicular germ cells, Sertoli cells and Leydig cells in SOG, SG-EGFⅠand SG-EGFⅡ(P>0. 05). Conclusion: EGF may play an important role in the regulation of spermatogenesis. Serum EGF concentration and high expression of EGF-R in Leydig cells have a positive correlation with spermatogenic function of the testes.     

Clinical significance of EGF and EGFR expression changes in cryptorchid boys

Aim: To explore the changes of epidermal growth factor (EGF) and epidermal growth factor receptor (EGFR) expressions in cryptorchid children and their clinical significance. Methods: The level of serum EGF was measured by radioimmunoassay (RIA) and the expression of EGFR by immunohistochemistry. Results: (1) The level of serum EGF was significantly lower in cryptorchid children than in normal subjects at age group of 59 years (P<0.01) and 10-14 years (P<0.01), (2) The level of EGF was significantly lower in boys with impalpable testis than in those with extracanalicular and intracanalicular testes (P<0.01), (3) The serum EGF level increased significantly 6 months after orchiopexy (P<0.05), (4) The EGFR expression in testicular Leydig's cells was lower in 2-4 year-old boys than in those over 5 years (P<0.05) and (5) the EGFR expression was less positive in the impalpable group and the intracanalicular group than that of the extracanalicular group (P<0.01). Conclusion: The EGF and EGFR expr essions may co     

大豆异黄酮在不同的雌激素环境下对MMTV-erbB-2转基因小鼠的作用

Objective To investigate the effect of the soybean isoflavones at different estrogen environments on the pathogenesis of breast cancer in MMTV-erbB-2 transgenic mice. Methods 150 fiveweek-old MMTV-erbB-2 transgenic female mice were phosen and divided into five groups; control group,low estrogen group 1, low estrogen group 2, high estrogen group 1 and high estrogen group 2. The incidence and latent period of breast cancer were observed, and the expression of estrogen receptor (ER) ,progesterone receptor (PR), and proliferating cell nuclear antigen (PCNA) proteins was detected by using immunohistochemistry SP method. Results The incidence of breast cancer in control group, low estrogen group 1, low estrogen group 2, high estrogen group 1 and high estrogen group 2 was 73. 3% , 96. 7% ,30. 3% , 40. 0% and 83. 3% , respectively, with the difference being not significant between control group and high estrogen group 2, and between low estrogen group 1 and high estrogen group 2 (P ＞ 0. 05 ) , but with the difference being significant among the other groups (P ＜ 0. 05 ). There was significant difference in the average latent period of breast cancer among all groups (P ＞ 0. 05 ). There was significant difference in the number of TEB between low-estrogen group 1 and other groups (P ＜ 0.05). There was significant difference in the erbB-2 expression among the groups ( P ＞ 0. 05 ). There was no significant difference in the expression of breast ER and PR between control group and other groups ( P ＞ 0. 05 ). The PCNA expression in breast tumor tissue in low-estrogen group 1 was significantly higher than other groups (P ＜0. 05) , and there was significant difference in the PCNA expression between control group and high estrogen group 2, between low estrogen group 1 and high estrogen group 2 (P ＜ 0. 05). Conclusion The soybean isoflavones at different estrogen environments play different roles in the occurrence and development of MMTV-erbb-2 transgenic mouse mammary tumor. In the context of low estrogen, soybean isoflavones could even promote breast cancer formation and development. In the context of high estrogen, soybean isoflavones could inhibit breast cancer and development.     

大豆异黄酮在不同的雌激素环境下对MMTV-erbB-2转基因小鼠的作用

Objective To investigate the effect of the soybean isoflavones at different estrogen environments on the pathogenesis of breast cancer in MMTV-erbB-2 transgenic mice. Methods 150 fiveweek-old MMTV-erbB-2 transgenic female mice were phosen and divided into five groups; control group,low estrogen group 1, low estrogen group 2, high estrogen group 1 and high estrogen group 2. The incidence and latent period of breast cancer were observed, and the expression of estrogen receptor (ER) ,progesterone receptor (PR), and proliferating cell nuclear antigen (PCNA) proteins was detected by using immunohistochemistry SP method. Results The incidence of breast cancer in control group, low estrogen group 1, low estrogen group 2, high estrogen group 1 and high estrogen group 2 was 73. 3% , 96. 7% ,30. 3% , 40. 0% and 83. 3% , respectively, with the difference being not significant between control group and high estrogen group 2, and between low estrogen group 1 and high estrogen group 2 (P ＞ 0. 05 ) , but with the difference being significant among the other groups (P ＜ 0. 05 ). There was significant difference in the average latent period of breast cancer among all groups (P ＞ 0. 05 ). There was significant difference in the number of TEB between low-estrogen group 1 and other groups (P ＜ 0.05). There was significant difference in the erbB-2 expression among the groups ( P ＞ 0. 05 ). There was no significant difference in the expression of breast ER and PR between control group and other groups ( P ＞ 0. 05 ). The PCNA expression in breast tumor tissue in low-estrogen group 1 was significantly higher than other groups (P ＜0. 05) , and there was significant difference in the PCNA expression between control group and high estrogen group 2, between low estrogen group 1 and high estrogen group 2 (P ＜ 0. 05). Conclusion The soybean isoflavones at different estrogen environments play different roles in the occurrence and development of MMTV-erbb-2 transgenic mouse mammary tumor. In the context of low estrogen, soybean isoflavones could even promote breast cancer formation and development. In the context of high estrogen, soybean isoflavones could inhibit breast cancer and development.     

人绒毛膜促性腺激素对青春期前低促性腺激素性腺发育不良型小阴茎皮肤组织表皮生长因子及其受体的影响

目的 观察人绒毛膜促性腺激素(HCG)对青春期前低促性腺激素性腺发育不良型小阴茎皮肤组织表皮生长因子(EGF)及其受体(EGFR)的影响.方法 10例经临床确诊的青春期前低促性腺激素性腺发育不良型小阴茎患儿予以HCG治疗;10例正常儿童为正常组.分别于治疗前、治疗后3个月进行阴茎长度测量;用酶联免疫吸附试验(ELISA)定量检测阴茎皮肤组织EGF的含量;用免疫组织化学染色(SP法)检测阴茎皮肤组织EGFR的表达.结果所有患儿治疗前阴茎长度(2.44±0.24)cm较正常组(4.29±0.26)cm短(P<0.01);其阴茎皮肤组织EGF含量(43.788±15.375)ng/L较正常组(87.106±14.483)ng/L低(P<0.01);其阴茎皮肤组织EGFR的吸光度(AD)为0.224±0.047,较正常组0.264±0.046差异无统计学意义(P>0.05).经HCG治疗后其阴茎长度(3.97±0.27)cm较治疗前(2.44±0.24)cm明显增长(P<0.01);同时其阴茎皮肤组织EGF的含量(75.694±16.014)ng/L较治疗前(43.788±15.375)ng/L升高(P<0.01);其阴茎皮肤组织EGFR的AD为(0.242±0.054),较治疗前(0.224±0.047)差异无统计学意义(P>0.05).结论 青春期前低促性腺激素性腺发育不良型小阴茎组织内EGF的含量低于正常同龄期儿童;HCG治疗可促进青春期前低促性腺激素性腺发育不良型小阴茎组织EGF的含量升高,从而促进阴茎生长发育.     

Comparative study on estrogen receptor, epidermal growth factor and epidermal growth factor receptor using immunocytochemical and biochemical assays in breast cancer

Estrogen receptor (ER), epidermal growth factor (EGF) and epidermal growth factor receptor (EGFR) were examined by immunocytochemical and biochemical assays in 86 breast carcinomas. The following results were obtained. 1. ER was stained in cellular nuclei by immunocytochemical assay using anti-ER monoclonal antibody. ER positive stained tumor cells were distributed in the various patterns. 2. Immunocytochemical analysis of ER was evaluated with the percentage of ER positive cells and the staining intensity. ER values between immunocytochemical and biochemical assays accorded in 79 out of 86 cases (91.9%). Significant correlation was obtained in both assays (p less than 0.01). A high tendency of the percentage of ER positive cells was demonstrated in PgR positive cases. 3. EGFR was evaluated as positive in 12 out of 38 cases (31.6%) by immunocytochemical assay and in 13 out of 38 (34.4%) by biochemical competitive binding assay using 125I labeled EGF, respectively. A significant inverse relationship was obtained between ER and EGFR values (p less than 0.05). 4. EGF was evaluated as positive in 22 out of 38 cases by immunocytochemical assay. EGF expression was observed in all EGFR positive tumors. Compared with ER and EGF staining, the percentage of ER positive cells was higher in EGF negative tumors than in EGF positive ones (p less than 0.05).     

人绒毛膜促性腺激素对小鼠睾丸、附睾表皮生长因子和睾酮的影响

为了探讨人绒毛膜促性腺激素 (h CG)与颌下腺、睾丸和附睾表皮生长因子(EGF)的相互调节机制 ,本研究对 ICR雄性小鼠在切除颌下腺和给予 h CG前后应用放射免疫方法测定睾丸和附睾 EGF变化以及睾丸和血清睾酮 (T)变化。结果 :去颌下腺后 ,睾丸 EGF和血清 T不降低 (P>0 .0 5 ) ,附睾 EGF明显增加 (P<0 .0 5 ) ,睾丸 T显著降低(P<0 .0 5 ) ;去颌下腺给药组与去颌下腺组相比 ,睾丸和附睾 EGF明显增加 (P<0 .0 5 ) ,睾丸 T明显增加 (P<0 .0 5 ) ,血清 T显著降低 (P<0 .0 5 )。假手术给药组与假手术组相比 ,睾丸和附睾 EGF明显增加 (P<0 .0 5 ) ,睾丸 T明显增高 (P<0 .0 5 ) ,血清 T不增加 (P<0 .0 5 )。假手术给药组与去颌下腺给药组相比 ,睾丸 EGF明显增加 (P<0 .0 5 ) ,附睾EGF明显降低 (P<0 .0 5 ) ,睾丸 T和血清 T均明显增加 (P<0 .0 5 )。结论 :(1 )睾丸与附睾均能产生 EGF。 (2 ) h CG可通过调节睾丸 T生物合成影响睾丸、附睾 EGF含量。 (3)颌下腺促进睾丸 T的生物合成。 (4 )颌下腺和 h CG调节睾丸、附睾 EGF合成的机制不同。     

己烯雌酚对小鼠睾丸引带中LGR8表达的影响

目的:通过体内实验研究己烯雌酚(DES)对小鼠睾丸引带中胰岛素样因子3受体LGR8的影响,从而探讨外源性雌激素对小鼠睾丸下降的影响。方法:8～10周龄KM孕鼠随机分为正常组、空白对照组和实验组(0.1、1.0、10、100μg/kg DES 4个剂量组),共6组,每组20只。于孕9～17 d每天分别给予实验组妊娠小鼠不同剂量的DES(0.1、1、10、100μg/kg),空白对照组给予等体积DMSO+生理盐水,正常组不给药。应用免疫组化和RT-PCR分别检测胎鼠和幼鼠睾丸引带中LGR8蛋白和mRNA的表达。结果:HE染色可见胎鼠正常组、对照组睾丸引带发育良好,中间的间叶组织和外周的肌源细胞之间分界清楚;实验组可见睾丸引带发育不良,间叶组织和肌源细胞之间无明显分界,组织结构紊乱。幼鼠正常组和实验组睾丸引带发育未见明显不同。LGR8表达于睾丸引带肌源细胞和间叶组织细胞,以肌源细胞表达为主。实验组LGR8阳性表达较正常组弱,胎鼠各实验组和幼鼠DES 1、10、100μg组与同发育阶段的正常组相比均有统计学意义(P<0.05)。DES高剂量(10、100μg)组与同发育阶段的正常组相比LGR8 mRNA表达增加(P<0.05)。各实验组PCR产物测序均未见明显突变。结论:DES可影响小鼠睾丸引带LGR8 mRNA和蛋白的表达,DES可能通过影响INSL3-LGR8信号系统干扰睾丸引带的发育,进而影响睾丸正常下降。     

血管内皮生长因子对关节软骨细胞诱导型一氧化氮合酶的影响

目的 观察血管内皮生长因子(VEGF)对体外培养的关节软骨细胞诱导型一氧化氮合酶(iNOS)表达的影响。方法 体外培养SD乳鼠关节软骨细胞,用白细胞介素(IL)-1β诱导的方法建立骨关节炎(OA)体外模型,实验分为4组,每组加入不同处理因素进行干预,A组:(正常对照组)不加任何处理因素;B组:10 μg/L VEGF;C组:10 μg/L IL-1β;D组:10 μg/L VEGF+ 10 μg/LIL-1β。采用实时荧光定量PCR( Real Time PCR)检测iNOS mRNA的表达,采用蛋白免疫印迹法( Western blot)检测iNOS蛋白的表达。结果 iNOS mRNA的表达:A组iNOS mRNA无表达,B组(9.64±1.64)、C组(17.27±2.01)及D组(28.93±6.63),3组的iNOS mRNA表达量显著升高,进一步组间比较,D组软骨细胞iNOS的mRNA表达水平明显高于B组(P＜0.01)及C组(P＜0.05),C组软骨细胞iNOS的mRNA表达水平高于B组(P＜0.05)。iNOS蛋白的表达:A组iNOS蛋白无表达,B组(0.44±0.12)、C组(0.74±0.07)及D组(1.38±0.38),3组的iNOS蛋白表达量显著升高,进一步组间比较,D组软骨细胞iNOS的蛋白表达水平明显高于B组(P＜0.01)及C组(P＜0.05),C组软骨细胞iNOS的mRNA表达水平高于B组(P＜0.01)。结论 在OA的发病过程中,VEGF可能通过上调软骨细胞iNOS的表达发挥重要作用。     

表皮生长因子受体和蛋白激酶B在胃癌组织中的表达及临床意义

目的探讨胃癌组织表皮生长因子受体（EGFR）和蛋白激酶B（AKT）在胃癌组织中的表达与胃癌临床病理特征及预后的关系。方法采用免疫组织化学方法检测84例胃癌组织和15例非癌胃组织中EGFR和AKT的表达情况,并分析其表达与胃癌患者临床病理特征及预后的关系。结果EGFR和AKT在胃癌组织的阳性表达率分别为55．9％（47／84）和64．3％（54／84）,明显高于非癌胃组织的20．0％（3／15）和6．7％（1／15）,差异均有统计学意义（P〈0．05,P〈0．01）。EGFR表达与胃癌分期有关,AKT表达则与胃癌淋巴结转移有关（均P〈0．01）。EGFR阴性表达和阳性表达患者5年总体生存率分别为49％和22％（P〈0．05）;AKT阴性表达和阳性表达患者5年总体生存率分别为45．7和30．2％（P〈0．05）。结论检测胃癌组织中的EGFR和AKT的表达,有助于判断胃癌恶性程度及评估预后。     

靶向巨噬细胞移动抑制因子的siRNA对小鼠大肠癌肝转移的影响

目的 探讨靶向巨噬细胞移动抑制因子(MIF)的小干扰RNA (siRNA)对BALB/C小鼠大肠癌肝转移的影响及其可能的机制。方法 盲肠造疝原位接种瘤块法建立BALB/C小鼠大肠癌肝转移模型。将成功建模的小鼠随机分为3组。分别每周2次肿瘤原位注射相同体积的靶向MIF的siRNA( MIF siRNA,0.15 ng/kg)、非特异性siRNA( NS-siRNA,0.15 ng/kg)及生理盐水(NS,0.15 ng/kg),治疗4周。治疗结束3d后,处死小鼠。肝脏连续切片,苏木素-伊红(HE)染色观察各组大肠癌肝转移;酶联免疫吸附试验(ELISA)检测血清MIF及血管内皮生长因子(VEGF)浓度;免疫组织化学染色检测肝转移灶微血管密度(MVD)。结果 MIF siRNA组、NS-siRNAR组及NS组的大肠癌肝转移率分别为10％、60％与70％(x2=8.30,P＜0.05),小鼠血清MIF分别为(20±4)、(72±8)与(78 ±7) ng/L(P ＜0.05);小鼠血清VEGF分别为(20±4)、(77±9)与(77±10) ng/L(P＜0.05);肝转移灶的MVD分别为19±3、29 ±6与35±7(P＜0.05)。结论 靶向MIF的siRNA降低了小鼠大肠癌肝转移的发生率,其机制可能是靶向MIF的siRNA抑制了MIF表达,下调VEGF的表达,减少了MVD。