Clone TN319.12 is most commonly used in vivo in mice to neutralize endogenous TNFalpha (tumor necrosis factoralpha), allowing researchers to study the role of TNFalpha in immune responses, inflammation, and various disease models.

Key in vivo applications include:

• TNFalpha neutralization studies: TN319.12 is injected into mice to block TNFalpha activity, enabling the investigation of TNFmediated pathologies such as autoimmune diseases, infections, and models of sepsis or endotoxin shock. This has been shown to protect mice from lethal endotoxin shock and to block detectable TNF in circulation following LPS challenge.
• Cytokine neutralization in disease modeling: The antibody is utilized to assess TNFalpha’s contribution in models of arthritis, infection, neuroinflammation, and cancer, among others.
• Cytokine measurement facilitation: As a component in the in vivo cytokine capture assay (IVCCA), TN319.12 is administered to bind circulating TNFalpha, increasing its halflife in serum and enhancing assay sensitivity for cytokine quantification. This is particularly valuable when analyzing cytokine profiles during immune responses.
• ELISA and flow cytometry: The clone is used both as a capture antibody in ELISA for sensitive detection of TNFalpha in mouse serum, and for intracellular cytokine staining and analysis by flow cytometry.

Important features of TN319.12 include:

• Crossreactivity: It can also neutralize mouse TNFbeta (lymphotoxin) to some extent.
• Specificity: While primarily targeting TNFalpha, the antibody binds both recombinant and natural (endogenous) cytokine forms.
• Safety and dosing: Typical in vivo dosing is approximately 250 µg per mouse for neutralization studies, but optimal concentration should be empirically determined for each model.

In summary, TN319.12 is a standard tool for in vivo functional blockade of TNFalpha in mice, supporting disease pathogenesis studies, cytokine quantification, and mechanistic dissection of TNFdriven immune responses.

The antibody TN319.12 is most frequently used in combination with the following types of antibodies or proteins in the literature:

• Biotinylated or fluorochromeconjugated antiTNFα detection antibodies (such as Poly5160 or BioLegend Poly5160) are widely used as secondary detection reagents in ELISA, ELISPOT, and flow cytometry with TN319.12 as the capture antibody.
• Isotype controls corresponding to the Armenian Hamster IgG isotype are standard for controlling specificity in flow cytometry and functional assays.
• Recombinant mouse or rat TNFα proteins are commonly included as assay standards or positive controls in ELISAs or neutralization assays.
• Companion polyclonal detection antibodies (e.g., biotinylated rabbit polyclonal antiTNFα) are typical in sandwich ELISAs, paired with TN319.12 for capture.

Additional examples from published protocols include:

• Alternative ELISA/ELISPOT clones: Clone 1F3F3D4 is often recommended as an alternative for ELISPOT capture.
• Functional assay partner antibodies: TN319.12 can be paired with other cytokineneutralizing or phenotyping antibodies in multiplex experiments to define cell subsets or cytokine interactions, such as antiIFNγ or antiIL6, though specifics depend on the experimental context.
• Blocking and specificity controls: Unconjugated, neutralizing TN319.12 is sometimes used as a blocking antibody to confirm staining specificity with conjugated forms of the antibody.

The most common pairings are:

• For ELISA/ELISPOT: TN319.12 (capture) + biotinylated Poly5160 (detection) + recombinant TNFα standard.
• For flow cytometry: TN319.12 (intracellular stain, often fluorochromeconjugated) + isotype control or blocking with unconjugated TN319.12.
• In neutralization or in vivo experiments: TN319.12 paired with isotype control or appropriate detection antibody to assess functional blockade.

These combinations enable sensitive, specific detection and quantification of mouse or rat TNFα in a range of experimental settings.

Clone TN319.12 is a monoclonal antibody widely cited in scientific literature for its ability to effectively neutralize murine tumor necrosis factoralpha (TNFα) and show crossreactivity with TNFbeta (lymphotoxin).

Key findings from its scientific citations include:

• Complete Neutralization of TNFα: TN319.12 can inhibit 100% of the lytic activity of both recombinant and natural murine TNFα at specific concentrations. This neutralizing capacity extends to TNF present in various biological samples, including those produced by activated T cell clones and hybridomas.

• CrossReactivity with TNFβ (Lymphotoxin): The antibody recognizes both TNFα and a higher molecular weight glycosylated form consistent with TNFβ. This was established through Western blot analysis, indicating broad specificity for TNF cytokines.

• In Vivo Protection: Administration of TN319.12 in mice challenged with endotoxin (LPS) blocked the detection of TNF in serum and protected the animals from lethal endotoxin shock, demonstrating its therapeutic potential in models of inflammation and septic shock.

• Utility in Cytokine Detection Assays: TN319.12 is used in ELISA and in vivo cytokine capture assays (IVCCA), significantly increasing the sensitivity of cytokine detection by extending their in vivo halflife, allowing for precise measurement of TNF levels in serum.

• Applications in Flow Cytometry and Staining: Conjugated forms of TN319.12 are recommended for intracellular staining and flow cytometric analysis of TNFα production in immune cells.

• Species Reactivity: While primarily reactive with mouse TNFα, the antibody also reacts with rat and rabbit TNFα as noted in numerous product citations, broadening its utility in preclinical research across species.

• Research on Disease Models: TN319.12 has been instrumental in dissecting the role of TNFα in various disease contexts, including inflammatory and autoimmune diseases, by enabling functional neutralization experiments.

• Antigen Distribution: TNFα detected by TN319.12 is expressed on a range of immune cells such as activated monocytes, neutrophils, macrophages, T cells, B cells, NK cells, and LAK cells, reflecting its central role in immune regulation.

• Cited in Numerous Studies: The antibody appears in foundational studies of TNF biology, disease mechanisms, and immunological assays, including work by Sheehan et al. (J. Immunol. 1989), Finkelman et al. (Curr. Prot. Immunol. 2003), and others.

In summary, clone TN319.12 is a crucial reagent for neutralizing murine TNFα/β, investigating TNF's role in immunity and inflammation, and enabling sensitive detection of TNF in laboratory animals, with broad validation across multiple studies.

Dosing regimens of clone TN319.12, an Armenian hamster monoclonal antibody targeting mouse TNFα, vary significantly depending on the mouse disease model, route of administration, experimental purpose, and expected duration of TNF blockade.

Key dosing regimens across different mouse models:

• General dosing range:
  • Typical single doses range from 250 µg/mouse (intraperitoneal) to 20–30 mg/kg (intravenous or intraperitoneal) for acute interventions in inflammatory or infectious models.
• TRUC colitis model:
  • 15 mg/kg i.p., once weekly for 4 weeks.
• NOD diabetes model:
  • 20 μg/g (i.e., 20 mg/kg) or 100 µg/injection, administered i.p. every other day for 21–24 days.
• Acute endotoxemia or sepsis (LPS challenge):
  • Single dose prior to LPS administration; specific mass not consistently cited, but protection from endotoxin shock confirmed.
• DSS colitis/other chronic models:
  • Comparable regimens to above, usually 10–15 mg/kg i.p. every 2–7 days, depending on study duration.

Supporting context and details:

• Route and frequency:
  • Most published regimens use intraperitoneal injection (i.p.), but intravenous (i.v.) dose is sometimes preferred for faster systemic distribution.
  • Frequency ranges from single doses for acute studies (e.g., LPS/endotoxin challenge) to multiple weekly or everyotherday injections for chronic or autoimmune models.
• Neutralization efficacy:
  • TN319.12 effectively neutralizes both murine TNFα and TNFβ (lymphotoxin, LT) in vivo and provides protection in inflammatory models such as LPSinduced endotoxemia.
• Formulation and preparation:
  • Endotoxinfree preparations are crucial for in vivo work (e.g., UltraLEAF™ or similar preparations).

Variability factors:

• Modelspecific disease severity, TNF dynamics, and experimental duration require titration of optimal antibody dose.
• Sponsors and antibody suppliers recommend pilot titrations for each new study or mutant mouse line due to variability in TNF production and sensitivity.

Summary:
Typical dosing of TN319.12 in mice ranges between 250 µg/mouse i.p. to 30 mg/kg i.v./i.p., given acutely or repeated at set intervals, with specific regimen tailored to disease model and study design. Individual protocols must be optimized according to experimental needs.