LCP1 / Plastin-2 · IHC design guide

Design Immunohistochemistry for LCP1

Plan LCP1 IHC on paraffin sections around selective cytoplasmic staining in immune cells (HPA tissue IHC). Tonsil germinal center cells provide a high-staining reference (HPA tissue IHC) for assessing chromogenic staining.

Evidence assembled Oct 2026 · For research use; verify linked source records and product datasheet before use

Immunohistochemistry protocol sheet for LCP1 (IHC for LCP1): expected localisation Cytoplasmic staining in immune cells (HPA tissue IHC), antibody A03361, validated IHC image, and IHC protocol steps — Printable **LCP1** IHC protocol sheet — expected localisation Cytoplasmic staining in immune cells (HPA tissue IHC), antibody A03361, controls and protocol steps. Open the full LCP1 IHC guide →

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LCP1 Immunohistochemistry Experimental Design Guide

Expected localisation, validated protocols, controls and antibodies — the at-a-glance facts below, then the full design guide.

Must know before staining

	Expected localisation	Cytoplasmic staining in immune cells (HPA tissue IHC)
	Staining pattern	Selective cytoplasmic staining in immune cells (HPA tissue IHC)
	Antigen retrieval	Citrate pH 6 HIER, heat-mediated (datasheet A03361)
	Positive control ⓘ	Appendix+4 more · see all
	Negative control ⓘ	Adipose tissue+4 more · see all

Important caveats

Reasons your staining may differ from the expected pattern.

	Fixation	Keep fixation consistent across sections (standard IHC practice; not target-specific); Matched tissue-IHC evidence does not establish the fixation claim. Validate the specimen-specific method before use. (selected-SKU IHC image A03361)
	Caveat	Epididymal glandular cells also stain strongly (HPA tissue IHC)
	Regulation	T-cell costimulation shifts localisation (UniProt)
	Isoform / epitope	2 isoforms; cytoplasmic epitope coverage is unknown (UniProt)

Section 1

Recommended LCP1 IHC & IF Protocols

The catalog antibody protocol and three published LCP1 IHC protocols cover formalin-fixed, paraffin-embedded breast tissue and FFPE tumor samples (PMC11229261; PMC11974013; PMC13266032).

Recommended immunohistochemistry (IHC-P) protocol parameters
Sample	Paraffin-embedded human B lymphocytic tumor tissue; fixative not specified (datasheet A03361)
Fixation	Image fixative and duration unreported (datasheet A03361); verify before use.
Sectioning	4–5 µm sections on charged slides (standard)
Deparaffinisation	Xylene, graded ethanol series to water (standard)
Antigen retrieval	Heat retrieval: Citrate pH 6, 20 min (datasheet A03361)
Peroxidase block	3% H2O2, 10 min, room temperature (standard)
Blocking	10% goat serum (datasheet A03361)
Primary antibody	Rabbit anti-LCP1, 0.5-1μg/ml (datasheet A03361)
Primary incubation	Overnight at 4 °C (datasheet A03361)
Detection	Streptavidin-biotin complex (SABC), DAB chromogen (datasheet A03361)
Counterstain	Hematoxylin, blue, dehydrate and mount (standard)
Expected result	LCP1-positive staining in germinal center cells of appendix (HPA tissue IHC: High). HPA tissue profile: Selective cytoplasmic expression in immune cells. No signal in the no-primary control.

💡Decision noteStart with heat-mediated citrate pH 6 retrieval for the catalog antibody (datasheet A03361). The cited studies do not specify retrieval conditions.

Section 2

What Is the Expected LCP1 Staining Pattern?

In paraffin-section IHC, expect predominantly cytoplasmic LCP1 staining in immune cells (HPA: Enhanced tissue IHC; selective cytoplasmic immune-cell expression). Germinal center cells, bone marrow hematopoietic cells, lung macrophages and splenic red-pulp cells are reported at High levels (HPA: tissue IHC). LCP1 is an actin-associated protein with no transmembrane segment (UniProt P13796: localization and topology).

What am I looking at on my slide?
Distinct cytoplasmic staining in germinal center cells, with nearby cell types less conspicuous.	This fits the reported selective pattern: appendix, lymph node and tonsil germinal center cells stain High (HPA: tissue IHC). Score the identified cells rather than assigning one intensity to the whole section (standard IHC practice).
Immune cells stain, but the apparent signal is exclusively nuclear.	An exclusively nuclear result conflicts with the expected cytoplasmic tissue pattern (HPA: tissue IHC) and cytoskeletal localization (UniProt P13796). Check whether counterstain, pigment or detection background is being mistaken for specific chromogen (standard IHC practice).
Broad staining appears in a cell population reported as negative, such as bronchial respiratory epithelium.	HPA reports bronchial respiratory epithelial cells as Not detected, while epididymal glandular cells are High (HPA: tissue IHC). Identify the stained cells first; persistent signal in the reported negative population may reflect cross-reactivity or endogenous detection activity (standard IHC practice).
A uniform haze covers tissue, empty spaces or many unrelated cell types.	That distribution does not match selective cytoplasmic immune-cell staining (HPA: tissue IHC). Inspect a no-primary control for detection background, then assess blocking, washes and primary-antibody concentration (standard IHC practice).
No convincing staining appears in a known-positive cell population.	Absence in, for example, lung macrophages or lymph node germinal center cells conflicts with their reported High staining (HPA: tissue IHC). Confirm that those cells are present before investigating retrieval, antibody performance and detection (standard IHC practice).

💡Expected LCP1 appearanceCall the result positive when identifiable immune cells show clear cytoplasmic chromogen, with High staining in the listed positive populations (HPA: tissue IHC); isolated nuclear color or broad signal in a reported negative cell population calls for control-based review (HPA: tissue IHC; standard IHC practice).

How each factor affects the staining
Cell identity and tissue context	LCP1 staining is selective, and epididymal glandular cells are a documented High exception to an immune-cell-only reading (HPA: tissue IHC). Compare like cell populations when choosing positive and negative reference areas (standard IHC practice).
Antibody validation	HPA rates tissue IHC reliability as Enhanced and lists 2 antibodies with Enhanced IHC validation: HPA019493 and CAB020673 (HPA: tissue IHC; antibody validation). This supports the reported pattern, but it does not validate every antibody or staining run.
Protein compartment	LCP1 has no transmembrane segment and associates with the cytoskeleton, junctions and cell projections (UniProt P13796: topology and localization). Interpret the paraffin-section result against HPA's cytoplasmic tissue pattern (HPA: tissue IHC).
Retrieval and specimen preparation	Antigen retrieval can be optimized against a known-positive and a no-primary control (standard IHC practice). No LCP1-specific retrieval condition or fixation-sensitivity finding is supplied by UniProt or HPA; avoid assigning an absent signal to a particular fixation effect.

Why is my staining missing, weak or wrong?
Situation	Likely cause	Next action
Known-positive immune cells have no signal.	The expected population may be absent, or the IHC workflow may have failed (HPA: High in lung macrophages and lymph node germinal center cells; standard IHC practice).	Verify cell identity, then check the positive control, retrieval, primary-antibody preparation and detection steps (standard IHC practice). No LCP1-specific retrieval setting is established here.
Most of the section looks diffusely brown.	Uniform color is inconsistent with selective cytoplasmic expression (HPA: tissue IHC). Background from blocking, washes or detection is possible (standard IHC practice).	Compare a no-primary control; review blocking and wash steps, and adjust antibody concentration only against a positive control (standard IHC practice).
A reported negative cell population stains strongly.	Misidentified immune cells, cross-reactivity or endogenous detection activity may explain the result (standard IHC practice); bronchial respiratory epithelium is reported Not detected (HPA: tissue IHC).	Confirm cell morphology and location, inspect the no-primary control, and compare a documented positive population on the same run (standard IHC practice; HPA: tissue IHC).
Color appears confined to nuclei.	Nuclear-only staining does not fit HPA's cytoplasmic tissue profile or UniProt's cytoskeletal localization (HPA: tissue IHC; UniProt P13796: localization).	Recheck the counterstain and chromogen visually; compare no-primary and positive controls before scoring the nuclei as LCP1-positive (standard IHC practice).
Signal seems weak despite visible immune cells.	Cell identity, detection performance or scoring threshold may be uncertain (standard IHC practice). HPA's High calls apply to specified populations, not every immune cell (HPA: tissue IHC).	Compare the same named cell population in a documented positive tissue and review the run controls before changing conditions (HPA: tissue IHC; standard IHC practice).
Q: Should IF/ICC show the same compartment as paraffin IHC?	HPA reports mainly plasma-membrane localization in ICC-IF, with supported actin-filament staining and uncertain cytosolic staining (HPA: subcellular ICC-IF); tissue IHC is described as cytoplasmic (HPA: tissue IHC).	A: Interpret each assay against its own HPA localization evidence. Use the dedicated IF/ICC guide for that assay's workflow (HPA: tissue IHC and subcellular ICC-IF).

Source: UniProt P13796 Human Protein Atlas tissue Human Protein Atlas subcellular

Experiment evidence

IHC & IF images showing LCP1 staining

IHC analysis of LCP1 using anti-LCP1 antibody (A03361). LCP1 was detected in paraffin-embedded section of human B lymphocytic tumor tissue. Heat mediated antigen retrieval was performed in citrate buffer (pH6, epitope retrieval solution) for 20 mins. The tissue section was blocked with 10% goat serum. The tissue section was then incubated with 1μg/ml rabbit anti-LCP1 Antibody (A03361) overnight at 4°C. Biotinylated goat anti-rabbit IgG was used as secondary antibody and incubated for 30 minutes at 37°C. The tissue section was developed using Strepavidin-Biotin-Complex (SABC)(Catalog # SA1022) with DAB as the chromogen.

A03361 · IHCIHC analysis of LCP1 using anti-LCP1 antibody (A03361). LCP1 was detected in paraffin-embedded section of human B lymphocytic tumor tissue.

IHC analysis of LCP1 using anti-LCP1 antibody (A03361). LCP1 was detected in paraffin-embedded section of human tonsil tissue. Heat mediated antigen retrieval was performed in citrate buffer (pH6, epitope retrieval solution) for 20 mins. The tissue section was blocked with 10% goat serum. The tissue section was then incubated with 1μg/ml rabbit anti-LCP1 Antibody (A03361) overnight at 4°C. Biotinylated goat anti-rabbit IgG was used as secondary antibody and incubated for 30 minutes at 37°C. The tissue section was developed using Strepavidin-Biotin-Complex (SABC)(Catalog # SA1022) with DAB as the chromogen.

A03361 · IHCIHC analysis of LCP1 using anti-LCP1 antibody (A03361). LCP1 was detected in paraffin-embedded section of human tonsil tissue. Heat mediated

IF analysis of LCP1 using anti-LCP1 antibody (A03361). LCP1 was detected in immunocytochemical section of A431 cells. Enzyme antigen retrieval was performed using IHC enzyme antigen retrieval reagent (AR0022) for 15 mins. The cells were blocked with 10% goat serum. And then incubated with 2μg/mL rabbit anti-LCP1 Antibody (A03361) overnight at 4°C. DyLight®488 Conjugated Goat Anti-Rabbit IgG (BA1127) was used as secondary antibody at 1:100 dilution and incubated for 30 minutes at 37°C. The section was counterstained with DAPI. Visualize using a fluorescence microscope and filter sets appropriate for the label used.

A03361 · IFIF analysis of LCP1 using anti-LCP1 antibody (A03361). LCP1 was detected in immunocytochemical section of A431 cells. Enzyme antigen retriev

HPA · Cerebral cortexHuman Protein Atlas IHC, Cerebral cortex. Source: https://www.proteinatlas.org/ENSG00000136167-LCP1/tissue/cerebral+cortex#imid_5433860

HPA · ColonHuman Protein Atlas IHC, Colon. Source: https://www.proteinatlas.org/ENSG00000136167-LCP1/tissue/colon#imid_5433786

HPA · LiverHuman Protein Atlas IHC, Liver. Source: https://www.proteinatlas.org/ENSG00000136167-LCP1/tissue/liver#imid_5433779

HPA · KidneyHuman Protein Atlas IHC, Kidney. Source: https://www.proteinatlas.org/ENSG00000136167-LCP1/tissue/kidney#imid_5433788

HPA · ICC-IF A-431Human Protein Atlas immunofluorescence, A-431, antibody HPA019493; green = LCP1, blue = nucleus, red = microtubules.

← swipe / scroll for more images →

Real IHC / IF data behind the staining-pattern expectations in this section.

Sample controls for LCP1 IHC & IF

🧪Run lung first: macrophages should stain strongly (HPA: High in lung macrophages). Use adipose tissue adipocytes as the negative tissue (HPA: Not detected in adipocytes); on the lung slide, use nonmacrophage cells with no signal above background as internal comparators, but confirm their identity because other leukocytes can express LCP1 (UniProt P13796 tissue specificity).

Positive control tissue: Appendix (Germinal center cells, HPA High)

Negative control tissue: Adipose tissue (HPA Not detected)

ICC-IF cell lines (HPA subcellular resource): HPA ICC-IF images show LCP1 in A-431, U-251MG, U2OS, JURKAT, SiHa, with annotated localisation: Plasma membrane (supported) (HPA subcellular).

Technical controls: Include a no-primary, secondary-only control; a concentration-matched rabbit IgG isotype control; and a matched LCP1 knockout specimen or immunizing-peptide competition if available (A03361 IHC caption: rabbit primary; standard IHC practice). Block endogenous peroxidase and assess endogenous biotin in lung sections before interpreting DAB staining (A03361 IHC caption: biotin–streptavidin detection with DAB; standard IHC practice).

⚠️Feasibility: No target-specific fixation window or fixation effect is reported, and the selected A03361 tissue-IHC caption does not state the fixative (A03361 IHC caption). That caption demonstrates citrate retrieval at pH 6 for 20 minutes in a paraffin section, but does not establish that retrieval is required; the supplied evidence does not establish whether frozen sections or IF are easier (A03361 IHC caption). Lung macrophage pigment and endogenous peroxidase can complicate DAB interpretation (standard IHC practice).

HPA tissue IHC evidence for LCP1

Comprehensive Human Protein Atlas IHC scoring per tissue (reliability: Enhanced — High consistency between antibody staining and RNA expression data. Antibody staining in cells/structures not annotated, view images.). Rows are taken directly from the HPA tissue chart — click any row's HPA link to view the source.

Positive expression · recommended positive controls

Tissue	Cell type	Level	Evidence	Source
Appendix	Germinal center cells	High	Protein (IHC)	HPA →
Bone marrow	Hematopoietic cells	High	Protein (IHC)	HPA →
Epididymis	Glandular cells	High	Protein (IHC)	HPA →
Lung	Macrophages	High	Protein (IHC)	HPA →
Lymph node	Germinal center cells	High	Protein (IHC)	HPA →

Undetected expression · recommended negative controls

Tissue	Cell type	Level	Evidence	Source
Adipose tissue	Adipocytes	Not detected	Protein (IHC)	HPA →
Adrenal gland	Glandular cells	Not detected	Protein (IHC)	HPA →
Breast	Adipocytes	Not detected	Protein (IHC)	HPA →
Bronchus	Respiratory epithelial cells	Not detected	Protein (IHC)	HPA →
Caudate	Glial cells	Not detected	Protein (IHC)	HPA →

Section 3

Advanced LCP1 IHC Tips

Troubleshoot LCP1 staining in paraffin sections by checking retrieval, cell identity, subcellular pattern, and detection controls (datasheet A03361; HPA tissue IHC; UniProt P13796).

What retrieval should I try when LCP1 staining is weak?

Use heat-mediated antigen retrieval in citrate buffer at pH 6 for 20 minutes before chromogenic IHC (datasheet A03361; caption A03361). The selected paraffin-section example used those conditions before primary antibody incubation (caption A03361). Check that sections remain covered by buffer and that heating and cooling are consistent across the staining run (standard IHC practice). If staining remains weak, compare a small set of retrieval conditions on adjacent sections while keeping antibody and detection steps constant (standard IHC practice). Judge any improvement in expected immune-cell staining alongside background in the same sections (HPA tissue IHC; standard IHC practice).

Could fixation explain inconsistent LCP1 staining between blocks?

The selected image shows a paraffin-embedded section, but its fixative and fixation duration are unreported (caption A03361). Target-specific sensitivity to fixation is therefore unknown; neither the tissue staining pattern nor protein features establish it (HPA tissue IHC; UniProt P13796). Record each block’s fixative, processing history, and section age when investigating variable staining (standard IHC practice). Compare blocks using the same citrate pH 6 retrieval and detection run, with an expected positive cell population present (datasheet A03361; HPA tissue IHC). If results still differ, report the block-level discrepancy without assigning it to a particular fixation effect (standard IHC practice).

Should LCP1 appear at the membrane or in the cytoplasm?

In tissue IHC, expect selective cytoplasmic staining in immune cells as the principal interpretive pattern (HPA tissue IHC). LCP1 also associates with the actin cytoskeleton at membrane ruffles and can move into actin-rich projections (UniProt P13796 localisation). Cell imaging supports a plasma-membrane location with additional actin-filament staining, while cytosol support is uncertain in that dataset (HPA subcellular). LCP1 has no transmembrane segment, so a peripheral membrane accent can reflect cytoskeletal association without implying a membrane-spanning protein (UniProt P13796 topology; UniProt P13796 localisation). Evaluate that accent against cell shape and adjacent cytoplasmic signal before scoring a chromogenic section (standard IHC practice).

Can this stain distinguish LCP1 isoforms or phosphorylation states?

LCP1 has 2 annotated isoforms and several modified residues, including phosphoserines near its amino terminus (UniProt P13796 isoforms; UniProt P13796 modified residues). Its EF-hand and calponin-homology domains occupy different parts of the protein, but the supplied antibody caption does not identify the recognized epitope (UniProt P13796 domains; caption A03361). Do not interpret staining intensity as isoform-specific or phosphorylation-specific without antibody evidence establishing that selectivity (standard IHC interpretation). Compare staining with an independent readout if that distinction is central to the experiment (standard IHC practice). For routine scoring, describe the result as LCP1 immunoreactivity and document the antibody identifier A03361 (caption A03361).

How should I assess LCP1 in multiplex immunofluorescence?

Treat IF as a separate application when following up a chromogenic LCP1 result; the selected product example documents paraffin-section IHC with DAB (caption A03361). Multiplex LCP1 with a marker of the expected cell population, such as a leukocyte marker for immune-cell-rich regions, and inspect overlap at the single-cell level (HPA tissue IHC; standard IF practice). Choose fluorophores after examining unstained tissue autofluorescence, placing the weaker signal in a cleaner spectral channel where possible (standard IF practice). Because LCP1 is cytoskeletal and has no transmembrane segment, permeabilisation must permit antibody access to intracellular epitopes (UniProt P13796 localisation; UniProt P13796 topology). Include single-stain and secondary-only controls when separating genuine colocalisation from bleed-through or background (standard IF practice).

How can I reduce diffuse brown background without losing immune-cell signal?

The selected chromogenic example blocked sections with 10% goat serum and used a biotinylated secondary, streptavidin–biotin detection, and DAB (caption A03361). Check reagent-specific background with a no-primary control and assess endogenous peroxidase activity using the detection system’s recommended block (standard chromogenic IHC practice). Because biotin-based detection can produce endogenous-biotin background, compare an appropriate biotin control if staining follows tissue structures unexpectedly (standard IHC practice). Titrate primary antibody and detection exposure against the documented 1 μg/ml starting condition while preserving expected immune-cell signal (caption A03361; standard IHC practice). Interpret diffuse color cautiously when it also appears outside the selective immune-cell pattern (HPA tissue IHC; standard IHC practice).

What should I score when comparing LCP1 across sections? ⚠ ANSWER MARKED FOR VERIFICATION

Define the compartment and cell population before scoring: tissue IHC shows selective cytoplasmic expression in immune cells (HPA tissue IHC). For cell-based analysis, report the percentage of positive cells and, when intensity is reliable, an H-score from 0–300 using intensity grades 0–3 (standard IHC scoring practice). For infiltration questions, count positive cells per mm² of viable tissue and record the area analyzed (standard IHC scoring practice). Normalize cell-based scores to the number of evaluable cells in the specified population, and density to viable tissue area (standard IHC scoring practice). Keep thresholds, counterstain assessment, and exclusion of folds or necrosis consistent across sections (standard IHC practice).

How do I distinguish true LCP1 staining from artefact?

Prioritize staining in plausible cells: LCP1 tissue IHC is selectively cytoplasmic in immune cells, including high staining in lung macrophages and lymph-node germinal center cells (HPA tissue IHC). A membrane-adjacent accent can be plausible because LCP1 associates with actin-rich ruffles, despite lacking a transmembrane segment (UniProt P13796 localisation; UniProt P13796 topology). Isolated nuclear color or uniform staining across unrelated cell populations deserves review against the expected pattern (HPA tissue IHC; standard IHC interpretation). Check whether apparent positives cluster at section edges, folds, or necrotic areas, where staining artefacts can occur (standard IHC practice). Compare those regions with no-primary and endogenous-peroxidase controls before accepting brown signal as LCP1 (standard chromogenic IHC practice).

Boster reagents

Best LCP1 / Plastin-2 IHC Antibodies

A03361 has IHC images from human paraffin sections and an IF image from A431 cells (A03361 image captions). Its listed reactivity covers human, mouse, and rat (catalog reactivity).

Real IHC data

Anti-Plastin L/LCP1 Antibody ®

Cat # A03361

View product →

A03361 has pictured IHC staining in human B lymphocytic tumor and tonsil paraffin sections, plus IF staining in A431 cells (A03361 image captions). M03361-1 is listed for IHC and ICC/IF in human, mouse, and rat; M03361-2 is listed for those applications in human, with no sample images supplied for either (catalog applications, reactivity, and image captions).

Which to pick: For tissue IHC, choose A03361: its own caption documents a human paraffin section stained at 1 μg/mL after citrate retrieval; the fixative is unreported (A03361 IHC image caption). For IF/ICC, A03361 has a pictured A431 cell result; M03361-1 and M03361-2 are rabbit monoclonals listed for ICC/IF without supplied images (A03361 IF image caption; catalog titles, applications, and image captions). For cross-species work, A03361 and M03361-1 list human, mouse, and rat reactivity, while M03361-2 lists human only; A03361’s pictured IHC samples are human (catalog reactivity; A03361 IHC image captions).

Each figure is that product's own IHC / IF validation image from its datasheet.

References

UniProt Consortium. UniProt entry P13796 (PLSL_HUMAN, Plastin-2).
Human Protein Atlas. LCP1 tissue IHC expression (reliability: Enhanced).
Human Protein Atlas. LCP1 subcellular location (ICC-IF): Mainly localized to the plasma membrane. In addition localized to the cytosol and actin filaments..
Human Protein Atlas. LCP1 antibody validation summary (3 antibodies).
IL7R depletion mitigates neuroinflammation and ischemic stroke via AKT dephosphorylation dependent LCP1 suppression in mice. Neurotherapeutics : the journal of the American Society for Experimental NeuroTherapeutics 2026 — PMC13382582.
LCP1 correlates with immune infiltration: a prognostic marker for triple-negative breast cancer. BMC immunology 2024 — PMC11229261.
Evaluation of tumorous LCP1 and ADPGK as predictive biomarker for immune-related adverse events in bone and soft tissue sarcomas treated with anti-PD-1 and anti-PD-L1 antibodies. BMC cancer 2025 — PMC11974013.
Prediction of immune-related adverse events in urological cancer during checkpoint inhibitor immunotherapy through immunohistochemical analysis of tumorous LCP1/ADPGK. Translational oncology 2026 — PMC13266032.
PubMed PMID:2252891 — UniProt-cited evidence.
PubMed PMID:14702039 — UniProt-cited evidence.
PubMed PMID:15057823 — UniProt-cited evidence.