OBJECTIVE: To explore the effect of dihydromyricetin on the expression of miR-98-5p and its mechanism in the development of Herceptin resistance in SKBR3 cells. METHODS: The expression of IGF2 and miR-98-5p and their interaction relationship were analyzed by bioinformatics analysis through TargetScan online databases. SKBR3 cells and drug-resistant SKBR3-R cells were cultured in cell experiments. Xenograft tumor mice were constructed by SKBR3 and SKBR3-R cells. Proteins were detected by western blotting and immunohistochemistry. Transfected cells were constructed by shRNA lentivirus vectors. RT-QPCR was used to detect RNA. Cell proliferation was detected by MTS method. Cell jnvasion was detected by Transwell assay. Luciferase reporting assays were used to verify RNA interactions. IGF-1R/HER2 heterodimer was determined by immunocoprecipitation. RESULTS: The expression of IGF2, p-IGF1R, p-Akt and p-S6K in SKBR3-R cells were significantly higher than those in SKBR3 cells, while the expression of PTEN protein was lower in SKBR3-R cells (P < 0.05). IGF1R/HER2 heterodimer in SKBR3-R cells was significantly increased (P < 0.01).The expression of IGF2 and invasion ability were significantly reduced while transfected with miR-98-5p in SKBR3-R cells (P < 0.05), but the IGF2 mRNA were no difference in both cells (P > 0.05). The expression of miR-98-5p was up-regulated and IGF2 was decreased in drug-resistant xenograft tumor mice after feeding with dihydromyricetin, and the tumor became more sensitivity to Herceptin (P < 0.05). CONCLUSION Dihydromyricetin could induce the expression of miR-98-5p, which binds to IGF2 mRNA to reduce IGF2 expression, inhibit the IGF-1R/HER2 formation, thereby reversing cell resistance to Herceptin in SKBR3-R cells.
Animals ; Cell Line, Tumor ; Flavonols/pharmacology* ; Humans ; Mice ; MicroRNAs/metabolism* ; Receptor, IGF Type 1 ; Trastuzumab

As a hormone with a number of biological effects, insulin not only displays the function of classic metabolic regulation, but also can regulate cell proliferation and differentiation, and ensure growth and development of embryos and young individuals. In vitro insulin can stimulate cell proliferation and differentiation. Insulin is also an important growth regulator in vivo, which has been proved in more and more studies. The role of insulin at the cellular level is triggered by the binding of insulin to its receptor located in the cell surface. However, insulin at the higher concentration can also been triggered by insulin-like growth factor-1 (IGF-1) receptor. Its role varies in different cell lines. Insulin receptor and insulin-like growth factor receptor-1 are widely expressed in human MDS and AML cell membranes. Recently, many studies related to the relationship between hyperinsulinemia and cancer have been reported. In this review the role and its possible mechanism in promoting human leukemia cell proliferation and inhibiting human leukemia cell proliferation are summarized. Furthermore, the potential application prospect of insulin analogues also will be described.
Cell Differentiation ; drug effects ; Cell Proliferation ; drug effects ; Humans ; Insulin ; pharmacology ; Leukemia ; metabolism ; pathology ; Receptor, IGF Type 1 ; metabolism ; Receptor, Insulin ; metabolism

This study was aimed to explore the effects of insulin on expression of insulin receptor (IR) and insulin-like growth factor-I receptor (IGF-IR) in Reh cells and promoting effect on proliferation of Reh cells. The proliferation of Reh cells were evaluated by CCK-8 assay. The expression levels of IR and IGF-IR mRNA in Reh cells at different times were detected by real-time quantitative polymerase chain reaction. The results showed that insulin promoted the proliferation of Reh cells in dose- and time-dependent manners. Compared with the control group, insulin promoted the proliferation of Reh cells obviously (P < 0.05). When Reh cells were treated with insulin 10(-9) mol/L for 24, 48 and 72 h, the relative quantity of IR expression (2(-ΔCt1)/2(-ΔCt2)) was 2.2520 ± 0.7431, 1.9956 ± 0.9692 and 3.9766 ± 1.3189, respectively, the relative quantity of IGF-IR expression was 1.0803 ± 0.2238, 1.6026 ± 0.6158 and 3.1013 ± 0.1008, respectively, compared with the control group. The expression levels of IR and IGF-IR mRNA in Reh cells treated with insulin were obviously increased compared with the control group. It is concluded that insulin promotes the proliferation of Reh cells. The high expression levels of IR and IGF-IR may closely related with the growth of leukemia cells.
Cell Line, Tumor ; Cell Proliferation ; drug effects ; Humans ; Insulin ; pharmacology ; Leukemia, Lymphoid ; metabolism ; pathology ; Receptor, IGF Type 1 ; metabolism ; Receptor, Insulin ; metabolism

OBJECTIVE: To investigate the expression of IGF-IR and PKC and their clinical significance in laryngeal squamous cell carcinoma(LSCC). METHOD: The expression of IGF-IR and PKC protein were detected by immunohistochemistry and Western blot in 60 cases of LSCC, 25 cases of adjacent non-tumorous laryngeal epithelium and 10 cases of normal laryngeal epithelium. RESULT: The positive rate of IGF-IR and PKC expression in LSCC were significantly higher than that in normal laryngeal epithelium and adjacent non-tumorous laryngeal epithelium (P < 0.05). IGF-IR positive expression were increased more in cases with stage III-IV, cervical lymph node metastasis and well differentiation than that in cases with stage I-II, non-lymph node metastasis and poor/mediate differentiation, respectively (P < 0.05). The positive rate of PKC in LSCC were correlated with clinical stage and cervical lymph node metastasis. There was a correlation between the expression of IGF-IR and PKC in LSCC. CONCLUSION The overexpression of IGF-IR and PKC in the laryngeal carcinoma may play an important role in the carcinogenesis and development of LSCC. It is suggested that detecting the expression of IGF-IR and PKC can be used for early diagnosis and treatment of LSCC.
Adult ; Aged ; Carcinoma, Squamous Cell ; metabolism ; pathology ; Female ; Humans ; Laryngeal Neoplasms ; metabolism ; pathology ; Male ; Middle Aged ; Protein Kinase C ; metabolism ; Receptor, IGF Type 1 ; metabolism

OBJECTIVETo investigate the therapeutic value of inhibiting the expression of insulin-like growth factor-I receptor (IGF-IR) using picropodophyllin (PPP) by studying the effects on proliferative and metastatic potentials of human hepatocellular carcinoma (HCC) using an in vitro cultured cell system.

METHODSIGF-IR expression in human HCC cell lines (Bel-7404, Bel-7402, HepG2, and Huh-7) and human hepatocytes (L02) was assessed at baseline (pre-treatment) and after PPP treatment by western blotting. Changes in cell cycle were analyzed by flow cytometry and in cell viability by sulforhodamine B staining. Early apoptosis was detected by annexin-V/FITC and propidium iodide double-staining assay. Caspase-3/7 activity was suppressed by z-VAD-FMK and analyzed by homogeneous luminescence assay. Effects on cell motility were tested by wound-scratch test. Between-group differences were assessed by t-test or one-way analysis of variance.

RESULTSIGF-IR was markedly up-regulated in all HCC cell lines (vs. non-hepatoma hepatocytes). HCC cells with PPP-inhibited IGF-IR showed time-dependent decreases in cell motility and viability. After treatment with PPP for 24 hours, the proportion of HCC cells in G1 phase was 2.1% +/- 0.4%, in S phase was 11.0% +/- 0.7%, and in G2/M phase was 87.1% +/- 0.6%, and no healing was observed in the wound-scratch assay. The PPP treatment induced cell apoptosis, as evidenced by enhanced caspase-3/7 activity; the proportion of annexin-V+/PI- cells was significantly higher in the HepG2 cells than in the non-hepatoma hepatocytes (16.4% +/- 0.4% vs. 5.8% +/- 0.2%, t = 14.05, P less than 0.01). After z-VAD-FMK treatment, the apoptosis rate was significantly higher in the HepG2 cells than in the non-hepatoma hepatocytes (11.3% +/- 0.7% vs. 5.8% +/- 0.2%, t = 11.83, P less than 0.01).

CONCLUSIONIGF-IR is associated with proliferation, cell motility, and apoptosis of HCC cells, and may be a promising molecular target for HCC.

Apoptosis ; drug effects ; Carcinoma, Hepatocellular ; metabolism ; pathology ; Cell Line, Tumor ; Cell Proliferation ; drug effects ; Humans ; Liver Neoplasms ; metabolism ; pathology ; Podophyllotoxin ; analogs & derivatives ; pharmacology ; Receptor, IGF Type 1 ; metabolism

OBJECTIVETo probe the expression level of insulin-like growth factor-I receptor (IGF-IR) in malignant clone cells of myelodysplastic syndromes (MDS).

METHODThe combination of fluorescence in situ hybridization (FISH) and immunochemistry (alkaline phosphatase anti-alkaline phosphatase, APAAP) was used to detect the expression of IGF-IR in the bone marrow cells of 40 MDS patients with abnormal karyotypes.

RESULTSThe average IGF-IR expression level on the clone cells \[(84.5 ± 14.2)%\] from the MDS cases was markedly elevated compared to the corresponding level on normal cells \[(11.4 ± 12.1)%\]. And the percentages of malignant clone cells in all 40 MDS cases were significantly correlated with the relevant percentages of IGF-IR positive nucleated cells (r = 0.929, P < 0.01).

CONCLUSIONSIGF-IR might be taken as a marker of clone cells in MDS for its trait to malignant proliferation.

Adolescent ; Adult ; Aged ; Aged, 80 and over ; Clone Cells ; metabolism ; pathology ; Female ; Humans ; Male ; Middle Aged ; Myelodysplastic Syndromes ; metabolism ; pathology ; Receptor, IGF Type 1 ; metabolism ; Young Adult

OBJECTIVE: To evaluate the expression of IGF-1R protein and its clinical signification in nasopharyngeal carcinoma. METHOD: SP immunohistochemical staining was performed to detect the expression of IGF-1R in 63 cases of NPC and 21 inflammatory nasopharyngeal mucosa; and the expression of IGF-1R in three NPC cell lines and chronic nasopharyngitis tissues was examined by western blots. RESULT: The positive rates of IGF-1R were 82.5% and 14.3% respectively in 63 cases of NPC and 21 inflammatory nasopharyngeal mucosa; it also showed stronger positive expression in Stage III-IV of NPC than that in stage I-II (P < 0 01); IGF-1R positive expression in cases of NPC with cervical lymph node metastasis was significantly higher than that of NPC without lymph node metastasis (P < 0.05); it more often appears in recurrent cases than in primary cases (P < 0.05); IGF-1R positive expression had a significantly stronger in patients whose survival time less than 5 years than that in patients whose survival time over 5 years (P < 0.01). CONCLUSION Over-expression of IGF-1R is related to poor differentiation of NPC, also may be linked with oncogenesis and development of NPC. The over-expression of IGF-1R may be one of a prognostic factors in NPC. The IGF-1R might be a potential therapeutic target in nasopharyngeal cancer.
Adult ; Aged ; Apoptosis ; Carcinoma, Squamous Cell ; metabolism ; pathology ; Cell Line, Tumor ; Female ; Humans ; Lymphatic Metastasis ; Male ; Middle Aged ; Nasopharyngeal Neoplasms ; metabolism ; pathology ; Receptor, IGF Type 1 ; metabolism

OBJECTIVETo investigate the impact and mechanism of microRNA (miR)-378 on hepatocellular carcinoma (HCC) cell growth.

METHODSThe human hepatoma cell line HepG2 and its derivative HepG2.2.15 (stably expressing hepatitis B virus (HBV)) were transduced with lentiviruses expressing miR-378 or non-expressing controls (nc-Lv). Effects on cell proliferation were assessed by the MTT assay and on colony-formation efficiency by clonogenic assay. Targets of miR-378 were predicted by bioinformatic analysis and validated by luciferase reporter assay in the human embryonic kidney cell line HEK293. Real-time polymerase chain reaction and western blotting were used to monitor expression of the endogenous targets in miR-378- overexpressing HepG2 and HepG2.2.15 cells.

RESULTSThe HepG2 and HepG2.2.15 cells transduced with lentivirus expressing miR-378 showed significantly lower cell proliferation and colony formation than the control cells transduced with nc-Lv (P less than 0.01 and P less than 0.05, respectively). The insulin-like growth factor 1 receptor (IGF1R) was predicted as a potential target of miR-378, and luciferase reporter activity of IGF1R was significantly decreased in the HEK293 cells co-transfected with miR-378 (by 41.8% vs. the control cells, P less than 0.01). Moreover, the miRNA-378-mediated effect was narrowed down to the 3'-untranslated region (UTR) of IGF1R. The miRNA-378-mediated reduction of IGF1R specifically involved its protein expression (P less than 0.01) and not its mRNA expression (P more than 0.05).

CONCLUSIONmiR-378 may suppress growth characteristics of HBV-related HCC by directly targeting the IGF1R 3'-UTR and inhibiting its protein expression.

Carcinoma, Hepatocellular ; metabolism ; pathology ; Cell Proliferation ; HEK293 Cells ; Hep G2 Cells ; Humans ; Liver Neoplasms ; metabolism ; pathology ; MicroRNAs ; genetics ; Receptor, IGF Type 1 ; genetics ; Transfection

OBJECTIVE: To investigate the effect of low-frequency pulsed electromagnetic fields (PEMF) on the maturation and mineralization of rat cranial osteoblasts and its relation to IGF-1R/NO signaling pathway. METHODS: The rat osteoblasts were isolated and cultured and randomly divided into blank control group, PEMF group, GSK group (IGF-1R blocker) and PEMF+GSK group. The cells were treated with 50 Hz 0.6 mT PEMF for 1.5 h/d. After 3 d of PEMF treatment, the expressions of protein kinase (AKT), inducible nitric oxide synthase (iNOS) and cGMP-dependent protein kinase (PKG) were detected by Western blotting; on 6 d of PEMF treatment alkaline phosphatase (ALP) activity was determined; on 12 d of PEMF treatment the calcification nodule formation was demonstrated by Alizarin red staining. RESULTS: NO level was significantly increased in rat osteoblasts treated with 50 Hz 0.6 mT PEMF for 1.5 h/d. Western blot analysis showed that the expressions of AKT, iNOS and PKG protein in PEMF group were higher than those in the control group (all <0.01); the ALP activity was increased(<0.05), and the PEMF group had the largest area of Alizarin red staining (<0.01). The expressions of AKT, iNOS and PKG protein in GSK group were lower than those in the control group; the ALP activity was decreased (<0.05), and the GSK group had the least area of Alizarin red staining (<0.01). The expressions of AKT, iNOS, PKG protein, the ALP activity and the area of Alizarin red staining in PEMF+GSK group were between PEMF group and GSK group. CONCLUSIONS PEMF may enhance the maturation and mineralization of rat cranial osteoblasts through IGF-1R/NO signaling pathway.
Animals ; Cell Differentiation ; Cell Proliferation ; Cells, Cultured ; Electromagnetic Fields ; Nitric Oxide ; metabolism ; Osteoblasts ; radiation effects ; Rats ; Receptor, IGF Type 1 ; metabolism ; Signal Transduction ; radiation effects

OBJECTIVE: To study the expression of insulin-like growth factor-1 receptor(IGF-1R) in nasal polyps and its relationship with allergic rhinitis. METHOD: The mRNA and protein expression of IGF-1R in 40 cases (20 cases with allergic rhinitis and 20 cases without) nasal polyps tissue (the CRSWNP group) and 20 middle turbinate tissue samples (the control group) were examined by fluorescence quantitative polymerase chain reaction (FQ-PCR) and immunohistochemistry. RESULT: The positive staining rate of IGF-1R protein of nasal polyps tissue is 70.8% and that of control is 12.3%, the expression of IGF-1R mRNA of nasal polyp is 0.748 +/- 0.111,which is significant higher than that of the control group is 0.107 +/- 0.208 (P < 0.01). No significant difference of the expression of IGF-1R mRNA between with and without allergic rhinitis cases and between with and without endoscopy sinus surgery history cases in the CRSWNP group. CONCLUSION The overexpression of IGF-1R maybe play important roles in the formation of nasal polyp. Hypersensitivity reaction type I mediated by IgE has no contribution to the overexpression of the IGF-1R.
Adult ; Case-Control Studies ; Female ; Humans ; Hypersensitivity ; pathology ; Male ; Middle Aged ; Nasal Polyps ; immunology ; metabolism ; pathology ; RNA, Messenger ; genetics ; Receptor, IGF Type 1 ; metabolism ; Young Adult