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Lumican

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All listed services and products are For Research Use Only. Do Not use in any diagnostic or therapeutic applications.

Background

Lumican is a secreted small leucine-rich proteoglycan (SLRP) encoded by the LUM gene, mainly produced by fibroblasts and other stromal cells and widely distributed in the extracellular matrix of the cornea, skin, liver, and other tissues. Lumican interacts with collagen fibrils through its leucine-rich repeat core and contributes to the regulation of collagen fibril organization and extracellular matrix structure. Keratan sulfate modification is particularly prominent in corneal lumican, whereas lumican in other tissues may occur predominantly as less-sulfated proteoglycan or glycoprotein forms. In physiological tissue remodeling, lumican supports collagen organization, corneal transparency, and connective tissue integrity. Altered lumican expression has also been associated with fibrotic remodeling and tumor-associated extracellular matrix changes. Therefore, lumican is an important research target for SLRP biology, extracellular matrix organization, fibrosis, and tumor stroma studies.

Lumican, as a secreted matrix proteoglycan, is released into the interstitial microenvironment to play a regulatory role. It relies on leucine-rich core motifs and keratin sulfate sugar chains arranged in series to bind collagen fibrils of type I and type II with high affinity, and mediates matrix structural remodeling. Its unique glycosylation characteristics of keratin sulfate form a clear functional differentiation with other SLRP members who lack this kind of sugar chain modification, giving it exclusive ability to maintain tissue homeostasis and regulate fibrosis. Lumican-mediated collagen remodeling pathway can link tissue injury signal, fibroblast activation and tumor cell invasion and migration process, and dynamically balance physiological wound repair, pathological scar hyperplasia and malignant tumor progress according to microenvironment oxygen content and inflammation level. This molecule is widely involved in corneal structural homeostasis maintenance, hepatic stellate cell activation and CAF-mediated tumor metastasis. Lumican dysfunction will destroy the orderly assembly of collagen fibers, significantly weaken fibrosis and the activation of tumor-promoting signal pathway. To sum up, Lumican is the key target of SLRP proteoglycan mechanism research, anti-fibrosis therapy and tumor matrix targeted drug development.

Fig. 1 Lumican-mediated ARDS early pulmonary fibrosis ERK/Slug EMT and myofibroblast differentiation pathway schematic. (OA Literature)Fig. 1 Full signaling schematic for studying Lumican ERK/Slug dual-pathway regulatory function driving early fibrotic responses in acute respiratory distress syndrome lung injury.1

Lumican Protein Function: Core Roles in Collagen Fibrillogenesis and Fibro-Tumor Tuning

The biological functions of keratan sulfate-modified secreted Lumican proteoglycan are fully focused on collagen fibril crosslinking and TLR4 fibrotic signal amplification:

  • Collagen Scaffold Assembly: Leucine-rich core binds collagen to control fibril spacing and tissue architecture.
  • Keratan Sulfate Glycan Modulation: Sulfated side chains fine-tune matrix mechanical stiffness properties.
  • Fibrosis Signal Triggering: Interacts with TLR4 to activate SMAD fibroblast proliferative cascades.
  • Tumor Stromal Modulation: CAF-secreted Lumican boosts integrin-FAK cancer cell migration capacity.
  • Disease Relevance: High stromal Lumican correlates with progressive organ fibrosis and advanced solid tumors.

Lumican Protein Product

Creative Biolabs offers high-quality Lumican proteins through optimized mammalian fibroblast expression systems, including full keratan sulfate glycosylated mature protein and core leucine-rich domain variants. These products retain native collagen and TLR4 dual binding activity, suitable for fibrosis and tumor stromal inhibitor screening assays. All Lumican proteins undergo strict quality control to ensure consistent performance and reliable application across matrix research platforms.

Lumican Protein Product

Not finding the membrane protein product you need? Contact us to start your one-stop custom service!

Lumican Stable Cell Line Product

Creative Biolabs provides custom-engineered Lumican stable cell lines, including CAF-mimic overexpression and blank empty vector control models. These cell lines are optimized for SLRP proteoglycan profiling and fibrotic migratory signal functional analysis. Each cell line undergoes stringent validation to ensure stable expression profiles during long-term hypoxic co-culture, and can be widely deployed for large-scale anti-fibrosis tumor compound screening experiments.

Lumican Stable Cell Line Product

Not finding the stable cell line product you need? Contact us to start your one-stop custom service!

Lumican Recombinant Antibody Product

High-specificity recombinant antibodies targeting Lumican are developed via advanced antibody engineering technologies, with no cross-reactivity with decorin/biglycan SLRP paralogs. These antibodies are validated for fibroblast stromal secretion detection and liver/tumor tissue expression profiling, and can be combined with collagen marker reagents to analyze complete Lumican-collagen matrix complexes in fibroblast models.

Lumican Recombinant Antibody Product

Not finding the recombinant antibody product you need? Contact us to start your one-stop custom service!

Product Features

  • Native Collagen & TLR4 Dual Binding Activity: Preserves intact matrix remodeling fibrotic capacity for stromal research.
  • Lumican Isoform Specificity: Eliminates non-specific cross-recognition of other SLRP proteoglycans.
  • Fibrosis Oncology Compatibility: Optimized reagent series for liver scarring and carcinoma stromal screening workflows.
  • Comprehensive Customization Support: Facilitates end-to-end development of customized proteins, antibodies and stable cell lines to address matrix proteoglycan research demands.

Custom Lumican Research Services

Beyond catalog products, Creative Biolabs offers specialized custom services for Lumican research:

  • Adjustment and control of collagen scaffold assembly: With the leucine-rich core structure directly combined with collagen fibrils, the arrangement spacing of collagen fibrils and the cross-linking mode of matrix are accurately adjusted, the spatial arrangement of fiber network is regulated, and the normal tissue structure and physiological matrix remodeling are maintained.
  • Regulation of Keratin Sulfate Glycosyl Modification: Based on the unique Keratin Sulfate Glycosyl Modification, fine-tune the mechanical stiffness and mechanical properties of extracellular matrix, forming a unique matrix modification feature different from other SLRP family proteins, and ensuring the mechanical stability of tissues.
  • Fibrosis signal activation function: activating downstream SMAD signal cascade through TLR4 receptor, continuously driving abnormal proliferation and activation of fibroblasts, inducing excessive deposition of collagen, and mediating pathological fibrosis and scar remodeling after chronic injury of liver, lung and other organs.
  • Regulation of tumor matrix microenvironment: Lumican secreted by tumor-related fibroblasts reshapes tumor extracellular matrix microenvironment, activates integrin-FAK pathway, significantly enhances the migration and invasion ability of tumor cells, maintains the dryness of tumor stem cells, and promotes the malignant progression of tumors.
  • Pathological characteristics of diseases: Abnormal high expression of matrix Lumican is highly correlated with the progress of multiple organ fibrosis, and it can also indicate the progress degree and poor prognosis of solid tumors, which is the specific core target of targeted research on fibrotic lesions and malignant tumors.

Frequently Asked Questions (FAQ)

  1. What is the primary function of Lumican?

    Lumican is a keratan sulfate SLRP that organizes collagen fibrils and activates TLR4-SMAD signaling to drive fibrosis and tumor stromal invasion.

  2. Why is Lumican a significant research target?

    Lumican acts as a shared biomarker for progressive organ fibrosis and metastatic epithelial malignancies.

  3. Are Creative Biolabs' Lumican products suitable for clinical use?

    No, all Lumican products and services are strictly for research use only, not intended for clinical diagnosis or human therapeutic trials.

  4. What types of Lumican products does Creative Biolabs offer?

    Offerings include full-length glycosylated Lumican proteoglycans, isoform-specific detection antibodies and custom stable cell lines for matrix research.

  5. How are Lumican proteins validated for activity?

    Lumican proteins are validated via collagen fibrillogenesis and TLR4 co-binding functional testing.

Reference
  1. Wang, Ke, et al. "Lumican is elevated in the lung in human and experimental acute respiratory distress syndrome and promotes early fibrotic responses to lung injury." Journal of translational medicine 20.1 (2022): 392. Under Open Access license CC BY 4.0, without modification. https://doi.org/10.1186/s12967-022-03597-z
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