scholarly journals Biochemical characterization of a gamma interferon-inducible cytokine (IP-10).

1987 ◽  
Vol 166 (4) ◽  
pp. 1084-1097 ◽  
Author(s):  
A D Luster ◽  
J V Ravetch
Keyword(s):  
Biochemical Characterization ◽  
Delayed Type Hypersensitivity ◽  
Hypersensitivity Response ◽  
Ifn Gamma ◽  
Primary Cell Lines ◽  
Inducible Protein ◽  
Monospecific Antisera ◽  
Delayed Type Hypersensitivity Response

An IFN-gamma-inducible protein, IP-10, has previously been described to belong to a gene family of chemotactic and mitogenic proteins, associated with inflammation and proliferation. Biochemical characterization of this predicted protein has been pursued through the development of polyclonal monospecific antisera to recombinant protein and synthetic peptides. These reagents establish that the IP-10 protein is secreted from a variety of cells (endothelial, monocyte, fibroblast, and keratinocyte) in response to IFN-gamma. Posttranslational processing occurs in the biosynthesis of this protein, resulting in a 6-7-kD species, which may reflect COOH-terminal cleavage. Pulse-chase studies indicate that this processing is a rapid event in the primary cell lines studied, completed in the 30-min labeling period. A model is presented for the processing and secondary structure of this protein. In an accompanying study, Kaplan, et al. using these antisera, demonstrate that the IP-10 protein is associated, in vivo, with a delayed-type hypersensitivity response.

In vitro and In Vivo Immunomodulatory Activity of Physalis angulata Concentrated Ethanolic Extract

Planta Medica ◽  
2020 ◽  
Author(s):  
Sérgio Ricardo Teixeira Daltro ◽  
Ivanilson Pimenta Santos ◽  
Paula Ladeia Barros ◽  
Diogo Rodrigo Magalhães Moreira ◽  
Therezinha Coelho Barbosa Tomassini ◽  
...  
Keyword(s):  
Cytokine Production ◽  
Ethanolic Extract ◽  
Delayed Type Hypersensitivity ◽  
Immunomodulatory Activity ◽  
Hypersensitivity Response ◽  
Immunomodulatory Drugs ◽  
Activated Macrophages ◽  
Physalis Angulata ◽  
Delayed Type Hypersensitivity Response

AbstractThe need for new immunomodulatory drugs is due to the side effects associated with the prolonged use of the currently used immunomodulatory drugs. In this context, the present work aimed to investigate the immunomodulatory effect of an ethanolic concentrated extract from Physalis angulata. The cytotoxicity of samples was determined using peritoneal macrophages though the Alamar Blue assay. The immunomodulatory activity of the ethanolic extract from P. angulata on activated macrophages was determined by measurement of nitrite and cytokine production. The immunosuppressive effects of the ethanolic extract from P. angulata was evaluated on lymphocyte proliferation and cytokine production. The effects of the extract on cell cycle progression and cell death on lymphocytes were evaluated by flow cytometry. Lastly, the ethanolic extract from P. angulata was tested in vivo in toxicological tests and in models of peritonitis and delayed-type hypersensitivity response. The ethanolic extract from P. angulata decreased nitrite, interleukin-6, interleukin-12, and TNF-α production by activated macrophages without affecting the cell viability. In addition, the ethanolic extract from P. angulata inhibited lymphoproliferation and the secretion of interleukin-2, interleukin-6, and IFN-γ, and increased interleukin-4 secretion by activated splenocytes. Flow cytometry analysis in lymphocyte cultures showed that treatment with the ethanolic extract from P. angulata induces cell cycle arrest in the G1 phase followed by cell death by apoptosis. Moreover, mice treated with the extract from P. angulata at 100 or 200 mg/kg did not show signs of toxicity or alterations in serum components. Finally, the ethanolic extract from P. angulata significantly reduced neutrophil migration and reduced paw edema in bovine serum albumin-induced the delayed-type hypersensitivity response model. Our results demonstrate the potential of the ethanolic extract of P. angulata as an alternative for the treatment of immune-inflammatory diseases.

UJI IMUNOMODULATOR DARI EKSTRAK ETANOL DAUN WARU (HIBISCUS TILIACEUS) DENGAN METODE HIPERSENSITIVITAS TIPE LAMBAT

2019 ◽  
Vol 1 (2) ◽  
pp. 11-16
Author(s):  
Yanna Rotua Sihombing ◽  
Debi Dinha Sitepu
Keyword(s):  
Treatment Group ◽  
Leaf Extract ◽  
Positive Control ◽  
Negative Control ◽  
Delayed Type Hypersensitivity ◽  
Hypersensitivity Response ◽  
Delayed Type Hypersensitivity Response

Immunomodulator is a compound that can increaase the imuno system. One of the plants that have immunomodulator’s activity is Waru Leaf (Hibiscus tiliaceus). the purpose of this research was to test the effect of immunomodulator by extract of Waru Leaf ethanol on rat male. The activity of immunomodulator was determined by using digital pletysmometer by measuring the differences between the last leg swelling’s volume and the first leg swelling’s volume. The treatment group were divided into 5 groups. Each group consistof 5 rats CMC-Na 0,5% (negative control), Stimuno®  32,5 mg/kgBW (positive control), dose of EEDW 50, 100 and 200 mg/kgBW, and bacteria E.coli as antigen. The results slowed that distribution of EEDW dose 200 mg/kgBW can give the effect of immunostimulant by swelling enthancement compared by CMC-Na 0,5 %. EEDW 200 mg/kgBW that have activity comparable with Stimuno®  32,5 mg/kgBW. Thus, it is concluded that of Waru Leaf extract has immunomodulator effects on delayed-type hypersensitivity response of rat male.

Biochemical characterization of Yin Yang 1 – RNA complexes

2008 ◽  
Vol 86 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Zachery R. Belak ◽  
Andrew Ficzycz ◽  
Nick Ovsenek
Keyword(s):  
Rna Binding ◽  
Biochemical Characterization ◽  
Ribonucleoprotein Complexes ◽  
Yin Yang 1 ◽  
Significant Difference ◽  
Yin Yang ◽  
Rna Interaction ◽  
Rna Complexes

YY1 (Yin Yang 1) is present in the Xenopus oocyte cytoplasm as a constituent of messenger ribonucleoprotein complexes (mRNPs). Association of YY1 with mRNPs requires direct RNA-binding activity. Previously, we have shown YY1 has a high affinity for U-rich RNA; however, potential interactions with plausible in vivo targets have not been investigated. Here we report a biochemical characterization of the YY1–RNA interaction including an investigation of the stability, potential 5′-methylguanosine affinity, and specificity for target RNAs. The formation of YY1–RNA complexes in vitro was highly resistant to thermal, ionic, and detergent disruption. The endogenous oocyte YY1–mRNA interactions were also found to be highly stable. Specific YY1–RNA interactions were observed with selected mRNA and 5S RNA probes. The affinity of YY1 for these substrates was within an order of magnitude of that for its cognate DNA element. Experiments aimed at determining the potential role of the 7-methylguanosine cap on RNA-binding reveal no significant difference in the affinity of YY1 for capped or uncapped mRNA. Taken together, the results show that the YY1–RNA interaction is highly stable, and that YY1 possesses the ability to interact with structurally divergent RNA substrates. These data are the first to specifically document the interaction between YY1 and potential in vivo targets.

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