SPCC18.17c Antibody

What is IL-17C and how does it differ from other IL-17 family members?

IL-17C is a member of the Interleukin-17 family, which comprises six proteins (IL-17A through IL-17F). While sharing 15-30% amino acid sequence identity with other family members, IL-17C has distinct structural and functional characteristics. Unlike IL-17B (which exists as a non-covalently linked dimer), IL-17C forms disulfide-linked dimers, sharing the conserved cysteine-knot fold near the C-terminus that is characteristic of this family . IL-17C has a much more restricted expression pattern than other family members, being detected primarily in adult prostate and fetal kidney tissues .

What are the key applications for IL-17C antibodies in immunological research?

IL-17C antibodies can be utilized in multiple experimental approaches:

• Immunohistochemistry on paraffin-embedded tissues

• Flow cytometry (particularly for intracellular staining)

• Sandwich immunoassays

• Detection of IL-17C in inflammatory conditions such as Crohn's disease

Each application requires specific optimization and controls for reliable results, with protocols typically available from antibody manufacturers.

What cellular sources produce IL-17C and what is its role in normal physiology?

IL-17C has a highly restricted expression pattern compared to other IL-17 family cytokines. It has been detected as a rare expressed sequence tag in adult prostate and fetal kidney libraries . The limited expression profile suggests specialized functional roles, though research into its physiological significance in non-inflammatory conditions remains ongoing. Researchers should be aware that expression may be significantly upregulated in pathological conditions.

What are the optimal conditions for detecting IL-17C in tissue samples via immunohistochemistry?

Successful IL-17C detection in tissue samples requires careful optimization:

• Sample preparation: Immersion fixed paraffin-embedded sections yield good results

• Epitope retrieval: Heat-induced epitope retrieval using basic pH reagents (e.g., VisUCyte Antigen Retrieval Reagent-Basic) is critical

• Antibody concentration: 10 μg/ml has been effective for human tissue samples

• Incubation conditions: 1 hour at room temperature

• Detection system: Anti-Mouse IgG HRP Polymer Antibody systems work well

• Visualization: DAB (brown) with hematoxylin counterstain (blue)

When properly optimized, specific IL-17C staining typically localizes to the cytoplasm of lymphocytes in samples like Crohn's intestinal tissue.

How can researchers optimize flow cytometry protocols for IL-17C detection?

Intracellular detection of IL-17C via flow cytometry requires specific technical considerations:

• Cell preparation: Paraformaldehyde fixation followed by saponin permeabilization is essential for intracellular access

• Antibody selection: Monoclonal antibodies (e.g., MAB1234) have demonstrated specificity

• Controls: Include appropriate isotype controls (e.g., MAB003) to establish baseline

• Secondary detection: Fluorophore-conjugated secondary antibodies such as Allophycocyanin-conjugated Anti-Mouse IgG provide good signal

• Validation: Compare results between positive cell lines (e.g., PC-3 human prostate cancer cells) and known negative populations

Researchers should verify antibody specificity through knockout/knockdown validation when possible.

How is IL-17C expression altered in inflammatory bowel disease, and what methodologies best detect these changes?

IL-17C shows distinct expression patterns in inflammatory bowel conditions such as Crohn's disease. Immunohistochemical analysis reveals specific staining localized to lymphocyte cytoplasm in inflamed intestinal tissue . When investigating IL-17C in IBD:

• Use properly fixed and processed intestinal biopsies

• Include both inflamed and non-inflamed tissue regions as controls

• Co-stain with lymphocyte markers to confirm cellular source

• Quantify expression levels using digital image analysis

• Correlate findings with clinical parameters and other inflammatory markers

Understanding IL-17C expression in IBD may provide insights into disease pathogenesis and potential therapeutic targets.

What is the relationship between IL-17C signaling and macrophage-mediated immune responses?

While direct evidence linking IL-17C to macrophage function is limited in the provided data, research on related immune pathways offers relevant insights. CD169+ macrophages represent a first line of defense against various viruses . These macrophages express immunomodulatory factors like Usp18 that regulate interferon signaling, which may intersect with IL-17 family cytokine pathways . When investigating such relationships:

• Use cell-specific knockout models to isolate effects

• Employ co-culture systems to assess cell-cell interactions

• Analyze cytokine production profiles following stimulation

• Measure downstream signaling activation

Understanding these relationships may elucidate how IL-17 family members contribute to innate immunity.

How can researchers validate IL-17C antibody specificity to ensure reliable experimental results?

Antibody validation is critical for meaningful IL-17C research:

• Isotype controls: Use appropriate isotype controls (e.g., MAB003) to determine non-specific binding

• Blocking peptides: Pre-incubation with recombinant IL-17C should abolish specific staining

• Cross-reactivity testing: Evaluate antibody performance with related IL-17 family proteins

• Multiple antibody approach: Use antibodies targeting different epitopes to confirm findings

• Genetic controls: When available, utilize IL-17C knockout tissues/cells as negative controls

Reporting detailed validation steps strengthens research credibility and reproducibility.

What are the most common technical pitfalls when working with IL-17C antibodies, and how can they be overcome?

Researchers should be aware of several technical challenges:

• Low endogenous expression: IL-17C has restricted expression patterns, requiring sensitive detection methods

• Fixation sensitivity: Overfixation may mask epitopes; optimize fixation times for each application

• Background issues: Use appropriate blocking reagents to minimize non-specific binding

• Antibody concentration: Titrate antibodies carefully for each experimental system

• Cross-reactivity: Validate specificity against other IL-17 family members

Addressing these challenges through methodical optimization improves experimental reliability.

How might single-cell analysis techniques enhance our understanding of IL-17C biology?

Emerging single-cell technologies offer new opportunities for IL-17C research:

• Single-cell RNA sequencing can identify previously unknown cellular sources of IL-17C

• Mass cytometry can simultaneously measure IL-17C expression alongside dozens of other markers

• Spatial transcriptomics can reveal the tissue microenvironment context of IL-17C expression

• CRISPR screens can identify novel regulators of IL-17C expression and signaling

These approaches may help resolve conflicting findings in the literature regarding IL-17C function.

What evidence supports the potential therapeutic targeting of IL-17C in inflammatory conditions?

While direct therapeutic applications remain exploratory, several lines of evidence suggest potential:

• IL-17C stimulates pro-inflammatory cytokine release (TNF-alpha, IL-1 beta) from monocytes

• IL-17C expression is elevated in inflammatory conditions like Crohn's disease

• IL-17 family cytokines contribute to various immune-mediated conditions

• Targeted antibody therapies against related cytokines have shown clinical success

Researchers exploring therapeutic applications should design experiments that address both efficacy and potential compensatory mechanisms within the IL-17 family.