FOLR1 Antibody, HRP conjugated

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Description

FOLR1 Antibody Overview

FOLR1 antibodies are primarily used to detect protein expression in research and clinical settings. These include polyclonal and monoclonal variants, often paired with HRP-conjugated secondary antibodies for signal amplification in assays like Western blotting (WB) and immunohistochemistry (IHC).

Key Antibody Types and Applications

Antibody CatalogHostApplicationsDetection MethodKey FindingsSource
AF5646GoatWB, FC, IHCHRP-conjugated secondaryDetects FOLR1 in HeLa and MCF7 cells; validated via knockout cell lines
MAB5646MouseWB, ICCHRP-conjugated secondaryIdentifies FOLR1 in human cortex and HeLa lysates (~40 kDa band)
23355-1-APRabbitWB, IHC, IFHRP-conjugated secondaryDemonstrates FOLR1 expression in breast cancer and HeLa cells
FOLR1-2.1 (VENTANA)MouseIHCHRP-conjugated detection systemUsed in diagnostic assays; detects glycosylated FOLR1 (~40 kDa)

HRP-Conjugated Detection in FOLR1 Research

HRP is commonly employed in secondary antibodies to enhance signal detection. While primary FOLR1 antibodies are typically unconjugated, their compatibility with HRP-based systems is critical for assay sensitivity.

Mechanism of Action

  • Western Blotting: Primary FOLR1 antibodies (e.g., AF5646, MAB5646) bind to target protein, followed by HRP-conjugated secondary antibodies (e.g., anti-goat or anti-mouse IgG) to catalyze chromogenic or chemiluminescent reactions .

  • Immunohistochemistry: HRP-conjugated detection systems (e.g., VENTANA FOLR1-2.1) enable visualization of FOLR1 in tumor tissues, aiding in prognostic assessments .

Performance Data

AntibodySensitivitySpecificityCross-Reactivity
AF5646Detects FOLR1 in MCF7 and HeLa cellsNo cross-reactivity with FOLR3 or mouse FOLR1<15% cross-reactivity with recombinant mouse FOLR1
MAB5646Identifies FOLR1 in human cortex lysatesSpecific to human FOLR1No reported cross-reactivity
23355-1-APDetects FOLR1 in breast cancer tissuesValidated in WB and IHCReacts with human, mouse, and rat FOLR1

Research Findings and Clinical Relevance

FOLR1 antibodies have advanced understanding of cancer biology and therapeutic targeting:

FOLR1 Expression in Cancers

  • Breast Cancer: Triple-negative breast cancers (TNBC) exhibit higher FOLR1 mRNA and protein levels, correlating with poor prognosis .

  • Ovarian Cancer: FOLR1 overexpression is linked to tumor aggression and resistance to chemotherapy .

Therapeutic Implications

  • MORAb-202: An anti-FOLR1 antibody–drug conjugate (ADC) with eribulin as the payload, showing efficacy in FOLR1-positive breast and lung cancer models .

  • CAR T-Cell Therapy: Fully human FOLR1-targeting CAR constructs demonstrate cytotoxicity against ovarian cancer cells, with minimal off-target effects .

Diagnostic Utility

The VENTANA FOLR1 (FOLR1-2.1) RxDx Assay uses a mouse monoclonal antibody to detect FOLR1 in epithelial ovarian cancer (EOC) tissues, with high interprecision accuracy (12 FOLR1-positive vs. 12 FOLR1-negative specimens) .

Challenges and Future Directions

  • Specificity: Cross-reactivity with FOLR2 or other folate receptors remains a concern, necessitating stringent validation .

  • Therapeutic ADCs: While MORAb-202 shows promise, clinical trials are ongoing to assess safety and efficacy .

Product Specs

Buffer
Preservative: 0.03% Proclin 300
Constituents: 50% Glycerol, 0.01M PBS, pH 7.4
Form
Liquid
Lead Time
Typically, we can ship your order within 1-3 business days of receipt. Delivery times may vary depending on the purchasing method and location. For specific delivery details, please consult your local distributor.
Synonyms
adult antibody; Adult folate binding protein antibody; Adult folate-binding protein antibody; FBP antibody; Folate Binding Protein antibody; Folate Receptor 1 Adult antibody; Folate receptor 1 antibody; Folate Receptor 1 Precursor antibody; Folate receptor adult antibody; Folate receptor alpha antibody; Folate receptor antibody; FOLR antibody; FOLR1 antibody; FOLR1_HUMAN antibody; FR alpha antibody; FR-alpha antibody; FRalpha antibody; KB cells FBP antibody; MOV18 antibody; Ovarian cancer associated antigen antibody; Ovarian tumor associated antigen antibody; Ovarian tumor associated antigen MOv18 antibody; Ovarian tumor-associated antigen MOv18 antibody
Target Names
Uniprot No.

Target Background

Function
FOLR1 Antibody, HRP conjugated, binds to folate and reduced folic acid derivatives, facilitating the delivery of 5-methyltetrahydrofolate and folate analogs into the interior of cells. It exhibits high affinity for folate and folic acid analogs at neutral pH. Upon receptor endocytosis and exposure to slightly acidic pH, a conformational change occurs, significantly reducing its affinity for folates and promoting their release. FOLR1 is essential for normal embryonic development and cell proliferation.
Gene References Into Functions
  1. This research highlights a novel approach employing a combination of EpCAM and FRalpha as CTC-capture targets to enhance the sensitivity, specificity, and speed of CTC detection in NSCLC. PMID: 29352248
  2. Multiple experimental studies in mice and human epidemiological and genetic investigations suggest that FOLR1 abnormalities contribute to a subset of human neural tube defects (NTD), although FOLR1 defects alone do not cause NTD. (Review) PMID: 28244241
  3. FOLR1 is highly expressed in ovarian cancer but is reduced following multidrug resistance. It may serve as a valuable biomarker for ovarian cancer and could be leveraged to enhance sensitivity to cisplatin treatment. PMID: 29433550
  4. Silencing of mTORC1 or mTORC2 significantly decreases the plasma membrane expression of FR-alpha and RFC transporter isoforms without affecting global protein expression. PMID: 27562465
  5. High Folate Receptor Alpha Expression Is Associated With Increased Risk of Recurrence in Triple-negative Breast Cancer. PMID: 28410844
  6. The expression of folate receptor 1 (FOLR1) was significantly higher and more frequent in metastatic lymph node samples from patients with advanced lung cancer. PMID: 29110850
  7. This study identified eight novel variants in SLC19A1 and twelve novel variants in FOLR1, FOLR2, and FOLR3. Pathogenic variants include c.1265delG in SLC19A1 resulting in a premature stop codon, four large insertion-deletion variants in FOLR3, and a stop-gain variant in FOLR3. PMID: 28948692
  8. This study investigated the design of folate receptor alpha (FRa)-targeted nano-liposomes (FLP) to enhance the anti-tumor effect by targeting delivery of exogenous PEDF gene to cervical cancer cells. These results demonstrate the potential of FLP as carriers for PEDF gene and FLP/PEDF as a promising novel strategy for gene therapy of cervical cancer. PMID: 27576898
  9. Data indicate that higher folate receptor alpha (FRalpha) expression is predictive of a favorable prognosis in pancreatic ductal adenocarcinoma (PDAC), suggesting FRalpha as a promising target for therapeutic interventions. PMID: 28430580
  10. These findings highlight the substantial therapeutic potential of novel 6-substituted pyrrolo[2,3-d]pyrimidine antifolates with dual targeting of PCFT and FRalpha for the treatment of Epithelial ovarian cancer, particularly those expressing a range of FRalpha, along with PCFT, and exhibiting cisplatin resistance. PMID: 28138029
  11. Low expression levels of FOLR1 are associated with neuroendocrine lung tumors. PMID: 27064343
  12. Folr1 emerges as a potential predictive candidate and therapeutic target for medulloblastoma. PMID: 28416738
  13. Folr1 is a favorable target for fluorescence-guided surgery, as the tumor-specific agent EC17 produces a clear fluorescent signal in ovarian and breast cancer tissue. PMID: 27014973
  14. The Folate receptor alpha is associated with the progression of cervical cancer and regulates cervical cancer cells' growth through phosphorylating ERK1/2, c-Fos, and c-Jun, key factors in the ERK signaling pathway. PMID: 28782518
  15. Folate receptor alpha protein was expressed in the majority of lung adenocarcinomas and a minority of lung squamous cell carcinomas. Folate receptor alpha protein expression correlated with histologic grade for lung adenocarcinomas, with the most notable difference observed between grade 1 and grade 3. PMID: 26599808
  16. This study demonstrates the efficacy of silencing HuR in lung cancer cells using a folate-conjugated nanoparticle system that targets folate receptor-alpha overexpressing cancer cells. PMID: 27328938
  17. This novel protocol provides an effective means to synthesize and design novel fluorescent nano-conjugates for FR expression investigation in tumor cells via targeted imaging, showing great potential in drug delivery mechanism studies and cancer therapy. PMID: 26606305
  18. RNA interference-mediated suppression of FOLR1 altered the gene expression profile of taxol-resistant nasopharyngeal carcinoma cells. Apoptosis-related genes and gene alterations in viral carcinogenesis/MAPK pathways might be crucial for reversing taxol resistance. PMID: 26617855
  19. This study confirmed similarities between epithelial ovarian cancer and fallopian tube, both normal and adenocarcinoma, using FOLR1, FOLR2, CD68, and CD11b markers. PMID: 25971554
  20. This study suggests RNA CAR T cell therapy as a potential treatment for common epithelial cancers expressing folate receptor-alpha. PMID: 26359629
  21. This study investigated the expression of folate receptors on murine and human adipose tissue macrophages. PMID: 26149693
  22. These findings suggest the clinical development of IMGN853 as a novel targeted therapy for patients with folate receptor alpha (FRalpha)-expressing tumors. PMID: 25904506
  23. This study suggests that FRalpha overexpression may play a role in the development of endometrioid endometrium carcinoma and its progression from endometrial hyperplasia. PMID: 26191275
  24. Triple negative/basal tumors demonstrated a significant association with increased expression of FOLR1 mRNA compared to ER+ and HER2+ tumors. PMID: 25816016
  25. This study conducted a molecular dynamic simulation of the binding process of folic acid to folate receptor alpha. PMID: 25323390
  26. Studies indicate folate receptor (FR) as a prognostic biomarker for ovarian cancer. PMID: 25564455
  27. The overexpression of folate receptor alpha mRNA was associated with the growth of pituitary adenomas. PMID: 26014017
  28. This study is the first to simultaneously evaluate both DNA methylation and protein expression of all three folate transporter genes, FOLR1, PCFT, and RFC1, in colorectal cancer. PMID: 25697897
  29. FRalpha down-regulation may suppress cervical cancer cell proliferation and promote apoptosis. PMID: 25081683
  30. Survival times are improved in non-small-cell lung cancer patients whose tumors show strong membranous folate receptor alpha expression. PMID: 24993594
  31. This study investigated the conditions associated with circulating FOLR1 protein in healthy individuals. PMID: 24810481
  32. This research suggests that quantitation of CTCs through FRalpha ligand-PCR could be a promising noninvasive method for diagnosing bladder TCC. PMID: 24771263
  33. 74% of ER/PR-negative and 80% of triple-negative breast cancers expressed folate receptor alpha (FRA). FRA expression was significantly associated with worse disease-free survival. PMID: 24028341
  34. Expression of FOLR1 was significantly elevated in the serum of ovarian cancer patients compared to the serum of both healthy controls and patients with benign gynecological conditions. PMID: 23528302
  35. FOLR1 expression was significantly higher in pituitary adenomas of patients older than 50 years. PMID: 23023342
  36. The FRalpha gene was expressed in all parathyroid cells analyzed, and the FRbeta gene was expressed by most. PMID: 24206618
  37. This study determined the crystal structure of human FRalpha in complex with folic acid at 2.8 A resolution. PMID: 23851396
  38. These findings further support the hypothesis that folate receptor-alpha expression in gynecologic tumors is due to the cell of origin normally expressing this receptor. PMID: 23518909
  39. EpCAM, FR-alpha, and VEGF-A are the most promising molecules for use in targeted intraoperative fluorescence imaging of endometriotic lesions due to their favorable expression patterns and biomarker characteristics. PMID: 23332132
  40. Studies indicate that folate receptor alpha (FOLR1), a folate transporter, is an attractive target for cancer therapy due to its high affinity for folate, restricted expression in normal tissue, and differential overexpression in malignant tissue. PMID: 23357463
  41. Overexpression of folate receptor alpha was associated with ovarian tumor progression. PMID: 23144806
  42. The folate receptor alpha translocates to the nucleus, where it binds to cis-regulatory elements at promoter regions of Fgfr4 and Hes1, and regulates their expression. PMID: 23243496
  43. A significant percentage of lung cancers, including squamous cell carcinomas in addition to adenocarcinomas, strongly express folate receptor alpha. PMID: 22984810
  44. PCR analysis confirmed the existence of FR-alpha, SMVT, and B ((0, +)) in Y-79 and ARPE-19 cells. PMID: 22304562
  45. High folate receptor alpha is associated with adenocarcinoma in non-small-cell lung carcinoma and EGFR mutation. PMID: 22729036
  46. alpha-FR may serve as a potential biomarker for predicting chemotherapeutic responses and clinical prognosis. PMID: 22265591
  47. Studies suggest that different clinical severities do not necessarily correlate with residual function of folate receptor alpha mutants. PMID: 22586289
  48. FR-alpha was expressed in the majority of serous ovarian tumors, although over 50% of cases showed only weak expression. PMID: 21647742
  49. FRalpha may play a crucial role in the development and progression of NFAs. PMID: 22089756
  50. This study demonstrates an ancient double-mutated haplotype 1816delC-1841A in the FOLR1 gene. PMID: 21938430

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Database Links

HGNC: 3791

OMIM: 136430

KEGG: hsa:2348

STRING: 9606.ENSP00000308137

UniGene: Hs.73769

Involvement In Disease
Neurodegeneration due to cerebral folate transport deficiency (NCFTD)
Protein Families
Folate receptor family
Subcellular Location
Cell membrane; Lipid-anchor, GPI-anchor. Secreted. Cytoplasmic vesicle. Cytoplasmic vesicle, clathrin-coated vesicle. Endosome. Apical cell membrane. Note=Endocytosed into cytoplasmic vesicles and then recycled to the cell membrane.
Tissue Specificity
Primarily expressed in tissues of epithelial origin. Expression is increased in malignant tissues. Expressed in kidney, lung and cerebellum. Detected in placenta and thymus epithelium.

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