Recombinant Human LAMC2 Protein: Handling & Application Protocol

Recombinant Human LAMC2 Protein is a key extracellular matrix component used to study basement membrane assembly, cell adhesion, and tumor invasion in a wide range of in vitro research applications.

Product Name

Recombinant Human LAMC2 Protein

SKU

rp369966

Protein Function

Laminin gamma-2 chain; component of laminin-5 heterotrimer involved in basement membrane formation, cell adhesion, migration, and invasion

Primary Applications

Cell adhesion assays, cell migration/invasion assays, Western blot, ELISA, in vitro binding studies

Recommended Storage

Store lyophilized protein at -20°C or -80°C; avoid repeated freeze-thaw cycles

Reconstitution

Reconstitute in sterile deionized water or PBS (pH 7.4) to a concentration of 0.1–1.0 mg/mL

Background: LAMC2 and Its Role in the Extracellular Matrix

LAMC2 (Laminin Subunit Gamma 2) encodes the gamma-2 chain of laminin, a major structural glycoprotein of basement membranes found in virtually all tissues. Laminin gamma-2 is a defining component of laminin-332 (formerly laminin-5), a heterotrimer that also includes the alpha-3 and beta-3 chains. Laminin-332 mediates stable cell adhesion to the basement membrane through interactions with integrin receptors, particularly α6β4 and α3β1, and plays essential roles in epithelial cell attachment, migration, and tissue homeostasis.

Aberrant expression of LAMC2 has been documented in multiple cancers, where it correlates with increased tumor invasiveness, epithelial-to-mesenchymal transition (EMT), and poor prognosis. As a result, Recombinant Human LAMC2 Protein is widely used in cancer biology, wound healing, and developmental biology research to model basement membrane environments and dissect cell–matrix interactions.

Materials and Reagents Required

Before beginning, ensure the following materials are available:

• Recombinant Human LAMC2 Protein (Aladdin Scientific, SKU: rp369966)
• Sterile, nuclease-free deionized water or phosphate-buffered saline (PBS, pH 7.4)
• Protein LoBind microcentrifuge tubes (to minimize adsorption losses)
• BSA (bovine serum albumin) for carrier protein supplementation if required
• Appropriate cell culture medium (serum-free for functional assays)
• SDS-PAGE and Western blot reagents (for QC verification)
• ELISA kit targeting LAMC2 (for activity confirmation, if applicable)
• Micropipettes, sterile tips, and ice bucket
• -20°C and -80°C freezers for storage

Step-by-Step Protocol: Reconstitution, Storage, and Quality Control

1. Reconstitution

1. Remove the vial from the freezer and allow it to equilibrate to room temperature for 10–15 minutes before opening to prevent condensation-related contamination.
2. Briefly centrifuge the vial (1,000 × g, 30 seconds) to pellet any lyophilized material at the bottom.
3. Add sterile deionized water or PBS (pH 7.4) directly onto the lyophilized cake. The recommended reconstitution volume should yield a stock concentration of 0.1–1.0 mg/mL. Consult the Certificate of Analysis (CoA) for the exact mass per vial.
4. Gently swirl or pipette the solution slowly — do NOT vortex, as vigorous agitation may denature the protein.
5. Allow the solution to stand at room temperature for 5–10 minutes to ensure complete dissolution.

2. Aliquoting and Storage

1. Aliquot the reconstituted protein into single-use volumes using Protein LoBind tubes to avoid repeated freeze-thaw cycles.
2. Add carrier protein (0.1% BSA) to dilute working aliquots if long-term stability is a concern.
3. Store working aliquots at -20°C for up to 1 month, or at -80°C for longer-term storage. Lyophilized protein, if unopened, may be stored at -20°C per manufacturer guidance.
4. Avoid more than two freeze-thaw cycles, as this may compromise protein integrity and biological activity.

3. Quality Control Verification

1. SDS-PAGE / Western Blot: Run a reduced SDS-PAGE to confirm the apparent molecular weight of LAMC2 and verify purity. Probe by Western blot using an anti-LAMC2 antibody to confirm identity.
2. Protein Quantification: Determine protein concentration using a BCA or Bradford assay with BSA standards before each experiment to normalize dosing.
3. Sterility check: If protein is to be used in live-cell assays, filter the reconstituted solution through a 0.22 µm sterile syringe filter prior to use.

Functional Application: Cell Adhesion and Migration Assays

Cell Adhesion Assay

1. Coat tissue culture plates or transwell inserts with Recombinant Human LAMC2 Protein at 1–10 µg/mL in PBS; optimal coating concentration should be determined empirically for each cell line.
2. Incubate coated surfaces at 4°C overnight or at 37°C for 1–2 hours.
3. Block uncoated surfaces with 1% BSA in PBS for 30–60 minutes at room temperature.
4. Wash three times with PBS before seeding cells in serum-free medium.
5. Seed cells at the desired density, incubate for the appropriate adhesion period (typically 30–120 minutes), then gently wash away non-adherent cells.
6. Quantify adhered cells by crystal violet staining, MTS assay, or fluorescence-based cell counting.

Cell Migration / Invasion Assay

1. For scratch (wound healing) assays, pre-coat culture dishes with LAMC2 protein, allow cell monolayers to form, create a scratch wound, and monitor closure by time-lapse microscopy.
2. For transwell migration assays, coat the lower surface of the transwell membrane with LAMC2 protein to serve as a chemoattractant matrix substrate. Add cells to the upper chamber in serum-free medium with chemoattractant in the lower chamber.
3. After the appropriate incubation period (typically 6–24 hours), remove non-migrated cells from the upper surface, fix, stain, and quantify migrated cells on the lower surface.

Note: Recombinant Human LAMC2 Protein is also suitable for use in ELISA-based binding assays, pull-down experiments to study integrin or receptor interactions, and as a coating matrix in 3D culture systems.

Troubleshooting and Best Practices

• Low protein solubility: If the protein does not dissolve readily, warm the reconstitution buffer to 37°C and gently pipette. Do not heat the protein above 37°C.
• Loss of biological activity: Confirm that storage conditions have been maintained. Protein activity may be compromised after multiple freeze-thaw cycles or prolonged storage at -20°C in the absence of carrier protein. When in doubt, use fresh aliquots from -80°C storage.
• Non-specific binding in adhesion assays: Ensure thorough BSA blocking steps and include a BSA-only coated control well to distinguish specific LAMC2-mediated adhesion from background.
• Variable coating efficiency: Coating efficiency can depend on the surface type (tissue culture treated vs. non-treated), protein concentration, and incubation conditions. Optimize empirically using fluorescently labeled LAMC2 or anti-LAMC2 immunostaining post-coating.
• Protein aggregation: If aggregates are visible, centrifuge the solution at 10,000 × g for 5 minutes at 4°C and use only the supernatant.
• Always include positive and negative controls in functional assays to validate experimental conditions and normalize inter-assay variability.

Frequently asked questions

What is the recommended reconstitution buffer and concentration for Recombinant Human LAMC2 Protein?

Recombinant Human LAMC2 Protein should be reconstituted in sterile deionized water or PBS (pH 7.4) to a stock concentration of 0.1–1.0 mg/mL. Consult the product Certificate of Analysis (CoA) for the exact mass per vial and adjust the reconstitution volume accordingly. Gentle mixing by swirling or slow pipetting is advised; do not vortex.

How should Recombinant Human LAMC2 Protein be stored to maintain stability?

Lyophilized protein should be stored at -20°C or -80°C prior to reconstitution. After reconstitution, aliquot immediately into single-use volumes and store at -80°C for long-term use or -20°C for up to one month. Adding 0.1% BSA as a carrier protein can improve stability of dilute working solutions. Avoid repeated freeze-thaw cycles, which can reduce biological activity.

What functional assays are Recombinant Human LAMC2 Protein suitable for?

Recombinant Human LAMC2 Protein is suitable for a broad range of functional assays including cell adhesion assays, cell migration and invasion assays (scratch/wound healing and transwell formats), ELISA-based binding studies, pull-down experiments to characterize integrin or receptor interactions, and as an extracellular matrix coating in 2D and 3D culture systems. It may also be used in Western blot and immunostaining experiments for validation purposes.

How can I verify the quality and identity of the reconstituted LAMC2 protein before my experiment?

Quality and identity can be confirmed by running a reduced SDS-PAGE to check the apparent molecular weight and purity profile, followed by Western blot using a validated anti-LAMC2 antibody to confirm protein identity. Protein concentration should be independently determined by BCA or Bradford assay. If the protein is intended for live-cell assays, sterile filter through a 0.22 µm membrane and perform a sterility check if required.

Why is LAMC2 relevant to cancer research?

LAMC2, as the gamma-2 chain of laminin-332, is frequently overexpressed in various epithelial cancers and correlates with increased invasiveness, epithelial-to-mesenchymal transition (EMT), and poor clinical outcomes. Recombinant Human LAMC2 Protein enables researchers to create physiologically relevant basement membrane substrates in vitro, making it a valuable tool for studying tumor cell migration, invasion mechanisms, and potential therapeutic targets.

References

1. Aumailley M, et al. A simplified laminin nomenclature. Matrix Biol. 2005;24(5):326-332. doi:10.1016/j.matbio.2005.05.006
2. Rousselle P, Scofield C, Lundstrom GP. An epithelial function of laminin-332 in wound healing. Adv Wound Care (New Rochelle). 2015;4(8):479-489.
3. Kariya Y, et al. Autocrine regulation of cancer cell invasiveness via laminin-332 processing. Sci Rep. 2018;8(1):13461.
4. Aladdin Scientific. Recombinant Human LAMC2 Protein (SKU: rp369966). Product datasheet. Aladdin Scientific.

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.