--- title: "Tight-junction proteins" description: "Assess tight-junction proteins and integrity in epidermal models." image: "https://cosmetic-labs.com/wp-content/uploads/tight-junction-service-1200x1200-1.webp" --- # Tight-junction proteins > Assess tight-junction proteins and integrity in epidermal models. Source: https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/tight-junction Created: 2025-01-27T03:31:02+00:00 Modified: 2026-10-25T10:20:50+00:00 Author: Emilie SCHOL Tight-junction proteins | Cosmetic Labs ## What is Tight-junction proteins? Tight-junction protein testing examines how an ingredient affects the abundance and localization of proteins such as claudin-1, occludin, and ZO-1 in epidermal models. Protein analysis and functional permeability measurements provide complementary evidence of junction integrity. ### Why do you need this service? Tight-junction studies investigate protein abundance and localisation in epidermal models. Functional permeability measurements can help determine whether a marker change corresponds to altered junction integrity. ## Be the first company on this service page No published company profiles are linked to Tight-junction proteins or its more specific services yet. Explore the service categories or add an explicitly supported capability to your company profile. [List your company](https://cosmetic-labs.com/account/companies/new) Definition ## Tight-junction proteins and epidermal barrier function Tight junctions regulate passage between cells in the viable epidermis. Testing investigates whether treatment changes the proteins and organization of these junctions, rather than assuming that higher expression alone establishes a stronger barrier. ### Expression and localization Immunofluorescence imaging can show junctional distribution, and Western blotting or other protein assays can measure abundance. qPCR assesses corresponding transcripts, not protein concentrations. Claudin-1 or claudin-4 expression and localization - Occludin-associated junction organization - ZO-1 distribution within junctional complexes - Cell viability and monolayer or tissue integrity E-cadherin may provide related cell-adhesion information, but belongs to adherens junctions rather than tight junctions. ### Functional interpretation Transepithelial electrical resistance or suitable tracer-permeability assays can test whether molecular changes accompany altered barrier properties. Results depend on the model and should be compared with vehicle and reference controls across justified concentrations and exposure times. These findings inform mechanistic evaluation of barrier-support products. They do not automatically prove barrier repair or satisfy regulatory requirements for every market or claim. Applications ## Relating junction markers to function Claudin-1, occludin and ZO-1 can provide information about junction components. The location of a protein matters as well as its abundance, so choose analytical and imaging endpoints according to the question. Expression data alone cannot establish a fully functioning junction. Functional measurements in an appropriate model can strengthen interpretation of a proposed barrier effect. Consider viability and the state of the tissue when comparing treatments, particularly after a controlled challenge. Use the findings for ingredient comparisons or to investigate a barrier mechanism. Human TEWL, perceived comfort and hydration remain different endpoints. Avoid assigning an expected protein increase or describing these laboratory measurements as clinical proof. ExplorationLearn more about Barrier & Hydration MechanismsInvestigate barrier and hydration mechanisms through epidermal lipids, junction proteins, differentiation and water-handling responses in skin models. Explore another Barrier & Hydration Mechanisms page on cosmetic-labs.com. #### [Skin barrier function efficacy testing](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/barrier-function) Preclinical skin barrier testing can use Raman microspectroscopy to assess lipid packing in reconstructed human epidermis models. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/barrier-function) #### [Keratinocyte differentiation](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/epidermal-diff) Assess epidermal cell maturation and barrier formation using histology, differentiation markers and functional measurements in suitable skin models. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/epidermal-diff) #### [Calcium gradient maintenance](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/calcium-gradient) Investigate epidermal calcium distribution using layer-resolved tissue measurements, with cellular imaging addressing related calcium-signalling responses. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/calcium-gradient) #### [Filaggrin production](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/filaggrin) Investigate ingredient effects on filaggrin through gene, protein and breakdown-product analysis in epidermal models relevant to skin hydration. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/filaggrin) #### [Ceramide Synthesis Mechanisms](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/ceramide-synthesis) Assess ceramide production in epidermal models using lipid profiling and biosynthesis measurements, distinguishing lipid abundance from synthesis rate. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/ceramide-synthesis) #### [Ceramide Synthesis in Epidermal Models](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/ceramide) Investigate ceramide production in epidermal cells or tissue models using lipid profiling and pathway measurements, separately from surface deposition. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/ceramide) #### [Intercellular lipid order](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/lipid-organization) Assess stratum corneum lipid packing and lamellar organisation with structural methods, complementing lipid composition and permeability measurements. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/lipid-organization) #### [Lamellar lipid reinforcement](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/lipid-barrier) Assess intercellular lipid-layer organisation in the stratum corneum using structural and functional measurements relevant to hydration mechanisms. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/lipid-barrier) #### [Corneodesmosome regulation](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/corneodesmosome) Investigate corneodesmosome regulation through junction proteins, protease activity and cohesion measurements relevant to barrier integrity and shedding. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/corneodesmosome) #### [Proteases inhibition](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/proteases) Measure ingredient effects on epidermal proteases, including kallikreins, and follow up in skin models to investigate balanced desquamation mechanisms. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/proteases) #### [Epidermal cohesion](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/epidermal-cohesion) Investigate epidermal adhesion and integrity through cohesion, shedding and barrier measurements in tissue models relevant to skin hydration research. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/epidermal-cohesion) #### [Hydration efficacy testing](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/hydration) Investigate hydration mechanisms through water-channel expression, humectant production, lipid synthesis and epidermal integrity in suitable models. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/hydration) #### [Hyaluronic acid synthesis](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/hyaluronic) Investigate endogenous hyaluronic acid production in skin cells using quantification and synthase-related measurements, accounting for added material. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/hyaluronic) #### [Aquaporin expression](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/aquaporin) Measure aquaporin expression, including AQP3 in keratinocytes, to investigate water-channel responses rather than directly measuring skin hydration. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/aquaporin) #### [NMF production](https://cosmetic-labs.com/services/clinical/efficacy/hydration-barrier-testing/skin-barrier-hydration/nmf) Assess natural moisturising factor components in epidermal models, distinguishing endogenous formation from compounds deposited by a formulation. 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