Monoclonal Antibody Against Sortilin Induces Apoptosis in Human Breast Cancer Cells.

Background: Sortilin has an important role in various malignances and can be used as a promising target to eradicate cancer cells. Methods: In this study, the expression of sortilin in 4T1 and MDA-MB231 cell lines was evaluated by flow cytometry and immunocytochemistry. Apoptosis assay was also applied to evaluate apoptosis induction in 4T1 and MDA-MB231 cell lines. Results: Based on cell surface flow cytometry results, anti-sortilin (2D8-E3) mAb could recognize sortilin molecules in 79.2% and 90.3% of 4T1 and MDA-MB231 cell-lines, respectively. The immunocytochemistry staining results confirmed sortilin surface expression. Apoptosis assay indicated that anti-sortilin mAb could induce apoptosis in 4T1 and MDA-MB231 cell lines. Conclusion: Our study revealed the important role of surface sortilin in breast carcinoma cell survival and its possible application as a therapeutic agent in cancer targeted therapies.

A novel ADC targeting cell surface fibromodulin in a mouse model of triple-negative breast cancer.

BACKGROUND: Triple-negative breast cancers (TNBCs) are highly aggressive and metastatic. To date, finding efficacious targeted therapy molecules might be the only window of hope to cure cancer. Fibromodulin (FMOD), is ectopically highly expressed on the surface of Chronic Lymphocytic Leukemia (CLL) and bladder carcinoma cells; thus, it could be a promising molecule for targeted therapy of cancer. The objective of this study was to evaluate cell surface expression of FMOD in two TNBC cell lines and develop an antibody-drug conjugate (ADC) to target FMOD positive TNBC in vitro and in vivo. MATERIALS AND METHODS: Two TNBC-derived cell lines 4T1 and MDA-MB-231 were used in this study. The specific binding of anti-FMOD monoclonal antibody (mAb) was evaluated by flow cytometry and its internalization was verified using phAb amine reactive dye. A microtubulin inhibitor Mertansine (DM1) was used for conjugation to anti-FMOD mAb. The binding efficacy of FMOD-ADC was assessed by immunocytochemistry technique. The anti-FMOD mAb and FMOD-ADC apoptosis induction were measured using Annexin V-FITC and flow cytometry. Tumor growth inhibition of anti-FMOD mAb and FMOD-ADC was evaluated using BALB/c mice injected with 4T1 cells. RESULTS: Our results indicate that both anti-FMOD mAb and FMOD-ADC recognize cell surface FMOD molecules. FMOD-ADC could induce apoptosis in 4T1 and MDA-MB-231 cells in vitro. In vivo tumor growth inhibition was observed using FMOD-ADC in 4T1 inoculated BALB/c mice. CONCLUSION: Our results suggests high cell surface FMOD expression could be a novel bio-marker TNBCs. Furthermore, FMOD-ADC could be a promising candidate for targeting TNBCs.

Monoclonal Antibody Against ROR1 Induces Apoptosis in Human Bladder Carcinoma Cells.

BACKGROUND: Receptor tyrosine kinase-like Orphan Receptor 1 (ROR1) is one of the promising cell surface antigens for targeting cancer cells. The aim of this study was to evaluate ROR1 cell surface expression in bladder cancer cells using a murine anti-ROR1 monoclonal antibody (mAb) called 5F1-B10 as well as investigate its potential in apoptosis induction. METHODS: Expression of ROR1 in two human bladder cell lines, 5637 and EJ138, as well as a non-cancerous human cell line, Human Fetal Foreskin Fibroblast (HFFF), was examined by flow cytometry and immunocytochemistry. Immunohistochemical staining of cancer and normal bladder tissues was also performed. RESULTS: The flow cytometry results showed that 5F1-B10 mAb could recognize ROR1 molecules in 86.1% and 45.6% of 5637 and EJ138 cells, respectively. The expression level of ROR1 was 5.49% in HFFF cells. The immunocytochemistry and immunohistochemistry staining results also confirmed the presence of ROR1 on the surface of both bladder cancer cells and tissues, respectively. The obtained data from apoptosis assay demonstrated that 5F1-B10 mAb could induce apoptosis in both 5637 and EJ138 cell lines. CONCLUSION: Taken together, our finding indicates the role of ROR1 in bladder cancer cell survival and suggests this receptor might be a promising target for developing novel therapeutic agents against bladder carcinoma.

Low 17ß-estradiol Levels Are Better Inducers of Regulatory Conditioned T Cells In-Vitro.

BACKGROUND: 17ß-estradiol (E2) has been known to modulate immune response. Recent studies indicate that E2 at pregnancy level plays a role in regulating T cell response. OBJECTIVE: To investigate the optimum dose of E2 (from 10-9 to 10-7 M) in mediating the generation of regulatory T cells (Tregs), using naive human CD4+ T cells from healthy women. METHODS: Naive peripheral T cells were purified and conditioned with soluble anti-CD28 in anti-CD3-coated plates in the presence or absence of E2. Flow cytometry was employed to assess the expression pattern of forkhead boxP3 (FOXP3) and programmed death-1 (PD-1). Proliferation and cytokine secretions were analyzed, using XTT and ELISA assays. RESULTS: In the presence of different doses of E2, the expression levels of anti-CD3/CD28 antibody-stimulated CD25/ FOXP3 and FOXP3/PD-1 in conditioned T cells (cT) were peaked at 1 ng/ml (early pregnancy level, E2(1)) (47.14% (37.3-74.9) and 32% (27.7-52.5), respectively) and a slight, but not significant, increase after declining at 36 ng/ml (late pregnancy/pharmaceutical, E2(36)) (19.4% (15.2-24.5) and 15.8% (10.6-26.8), respectively). E2(1) cT showed a significantly reduced proliferation capacity (p<0.05) and secretion of IL-10 was enhanced in supernatants of E2(1 and 36) cT (p<0.05). In contrast to decreased TNF-α and IFN-γ secretions in E2(1) cT supernatants, E2(36) stimulated TNF-α and IFN-γ secretions (p<0.05 and p<0.01, respectively). CONCLUSION: Our results indicate that the differential effect of E2 on generation of Tregs is consistent with the possibility that lower levels of pregnancy E2 are most efficient in induction of Tregs.

Polymorphisms in the Estrogen Receptor Beta Gene and the Risk of Unexplained Recurrent Spontaneous Abortion.

BACKGROUND: Recurrent Spontaneous Abortion (RSA) is caused by multiple genetic and non-genetic factors. Around 50% of the RSA cases have no known etiology and are considered as Unexplained RSA (URSA). Estrogens, via binding to their receptors, play an important role in female reproduction. This study aimed to investigate whether single nucleotide polymorphisms (SNPs; +1082G/A, +1730G/A and rs1256030 C/T) in the estrogen receptor beta (ESR2) gene are associated with susceptibility to URSA in a population of Iranian women. METHODS: In this case-control study, the study groups consisted of 240 subjects with a history of URSA and 102 fertile women as controls. Serum levels of follicle stimulating hormone (FSH), luteinizing hormone (LH), and estradiol (E2) were measured on day 2-3 of menstrual cycle. Two functional SNPs, +1082G/A (a silent mutation in exon 5) and +1730G/A (3' untranslated region of the exon 8), and one intron, rs1256030C/T, in the ESR2 gene were genotyped, using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis. RESULTS: Serum levels of LH were significantly increased in URSA women. No significant differences in distribution of +1082G/A, +1730G/A and rs1256030C/T between URSA and control groups were observed. CONCLUSION: Our findings suggest that the studied SNPs on ESR2 gene may not be associated with URSA.

Effects of Combined Soy Isoflavone Extract and Docetaxel Treatment on Murine 4T1 Breast Tumor Model.

BACKGROUND: Emergence of drug resistance has brought major problems in chemotherapy. Using nutrients in combination with chemotherapy could be beneficial for improvement of sensitivity of tumors to drug resistance. Soybean-derived isoflavones have been suggested as chemopreventive agents for certain types of cancer, particularly breast cancer. In this study, the synergistic effects of soy isoflavone extract in combination with docetaxel in murine 4T1 breast tumor model were investigated. METHODS: In this study, mice were divided into 4 groups (15 mice per group) of control, the dietary Soy Isoflavone Extract (SIE, 100 mg/kg diet), the Docetaxel (DOCE, 10 mg/kg) injection and the combination of dietary soy isoflavone extract and intravenous docetaxel injection (DOCE+SIE). After 3 injections of docetaxel (once a week), 7 mice were sacrificed to analyze MKI67 gene and protein expressions and the rest were monitored for diet consumption, tumor growth and survival rates. RESULTS: In DOCE+SIE group, diet consumption was significantly higher than DOCE group. While lifespan showed a trend towards improvement in DOCE+SIE group, no significant difference was observed among the 4 studied groups. Tumor volume was not significantly affected in treated groups. A lower but not significant MKI67 protein expression was detected in western blot in DOCE+SIE group. The mRNA expression was not significantly different among groups. CONCLUSION: The results suggest that the combination of soy isoflavone as an adjunct to docetaxel chemotherapy can be effective in improving diet consumption in breast cancer.

Association study of forkhead box P3 gene polymorphisms with unexplained recurrent spontaneous abortion.

Unexplained recurrent spontaneous abortion (URSA) has been suggested to be associated with the failure of fetal-maternal immunological tolerance in which the regulatory T lymphocytes (Tregs) play a crucial role. This study evaluated the association between single-nucleotide polymorphisms (SNPs) in the forkhead/winged helix transcription factor (FOXP3) gene, a key factor for the development and function of Tregs, and URSA, in an Iranian population. In this case-control study, 195 patients with a history of URSA and101 healthy women were included as case and control groups respectively. Four SNPs in the FOXP3 gene, two in the promoter region: -924A/G and -3279C/A, and two intronic, -20G/A and +459T/C, were genotyped using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis. The -924A/G (p<0.0001) and -20G/A (p=0.008) polymorphisms were found to be associated with URSA. The respective odds ratios (OR) for bearing -924A/G and -20G/A gene polymorphisms were 4.1 [95% CI 2.3-7.5] and 2.1 [95% CI 1.2-3.6] fold higher in URSA women than those in controls. Thus, there were significant differences in the distribution of A and G alleles of -924A/G and -20G/A between URSA and controls (p=0.001, OR; 3.6 [95% CI 2.1-6.1] and p=0.006, OR; 1.6 [95% CI 1-2.6] respectively). No associations were found for -3279C/A and +459T/C polymorphisms between URSA and controls. These results suggest that polymorphisms of the FOXP3 gene might confer susceptibility to URSA, probably by altering FOXP3 function and/or its expression.

Investigation on estrogen receptor alpha gene polymorphisms in Iranian women with recurrent pregnancy loss.

BACKGROUND: Recurrent pregnancy loss (RPL) is a multifactorial disorder. Environmental factors and genetics can affect pregnancy outcomes. OBJECTIVE: Conflicting data suggest an association between estrogen receptor alpha (ESR1) gene polymorphisms and RPL. In this study, such association was investigated in Iranian women with RPL. MATERIALS AND METHODS: In this case control study, blood samples were collected from 244 women with a history of three or more consecutive pregnancy losses and 104 healthy women with at least two live births. Using polymerase chain reaction- restriction fragment length polymorphism (PCR-RFLP), we studied -397C/T and -351A/G polymorphisms on ESR1 gene in case and control subjects. RESULTS: The genotypic frequencies of -397C/T and -351A/G polymorphisms on ESR1were not significantly different between RPL and control groups (p=0.20 and p=0.09, respectively). A significantly negative correlation was observed between -397C/T and -351A/G (r=-0.852, p<0.001) in RPL women and complete linkage disequilibrium between the investigated polymorphisms was found (D': 0.959; r-square= 0.758, p<0.001). CONCLUSION: This investigation suggests that the analyzed polymorphisms on ESR1gene are not associated with an increased risk of RPL in the studied population.