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Mesothelioma therapeutic agent

a mesothelioma and therapeutic agent technology, applied in the field of new mesothelioma therapeutic agents and mesothelioma cell inhibitors, can solve the problems of poor prognosis, resistance to treatment of malignant pleural mesothelioma, and difficulty in previous therapeutic reports on mesothelioma

Inactive Publication Date: 2007-06-14
CHUGAI PHARMA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a novel mesothelioma therapeutic agent that contains an IL-6 antagonist as its active ingredient. The IL-6 antagonist can inhibit the growth of mesothelioma cells by interrupting signal transmission related to IL-6. The therapeutic agent can be in the form of an IL-6 antagonist, such as an antibody to IL-6 or an antibody to IL-6 receptor. The use of an IL-6 antagonist can provide a more effective treatment for mesothelioma and a growth inhibitor for mesothelioma cells.

Problems solved by technology

Numerous different classifications of the clinical disease stages have been used for mesothelioma, and since the methods for classifying the disease stage used differ, previous therapeutic reports on mesothelioma have encountered difficulties when comparing the results of treatment (Nakano, Respiration, Vol. 18, No. 9, pp.
Malignant pleural mesothelioma is resistant to treatment, is associated with an extremely poor prognosis, and requires that countermeasures be taken immediately (Nakano, Respiration, Vol. 18, No. 9, pp.
For example, although the folic acid antagonist, methotrexate (MTX), has a satisfactory efficacy rate of 37% in large-dose single treatment in combination with leucovin, its use has not proliferated due to the technical difficulty associated with application to mesothelioma that causes retention of a large amount of pleural fluid (Nakano, Journal of Clinical and Experimental Medicine (March Supplement), “Respiratory Diseases”, pp.

Method used

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Examples

Experimental program
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Effect test

example 1

Production of IL-6 by Malignant Mesothelioma Cell Lines

[0142] Culturing of malignant mesothelioma cell lines MSTO, H2052, H28, H226 and H2452 was started at a cell concentration of 5×104 / well in a 24-well plate containing culture liquid (RPMI containing 10% fetal calf serum (FCS)), the cell culture liquid was replaced on the following day, after which the cells were cultured for additional 3 days followed by measuring the concentrations of IL-6 in the culture supernatant using a fully automated chemiluminescent enzyme immunoassay system (Fujirebio, Lumipulse) and correcting for the amount of cellular protein. Those results are shown in FIG. 1. The experiment was repeated three times. Although cell line H28 did not produce IL-6, the other four lines produced IL-6. Cell lines H2052 and H226 produced particularly high levels of IL-6.

example 2

Expression of IL-6R in Malignant Mesothelioma Cell Lines

[0143] The expression levels of IL-6 receptor were measured for five malignant mesothelioma cell lines at the mRNA level. KT-3 cells were used for the positive control, and synoviocytes were used for the negative control. These cells were cultured for 48 hours in RPMI containing 10% FCS, and mRNA that encodes IL-6 receptor IL-6R) in the cells was measured by reverse-transcribed PCR (RTPCR) using the GeneAmp PCR System (Applied Biosystems) for the detection device. Those results are shown in FIG. 2. FIG. 2 (bottom) indicates the amount of mRNA of the GAPDH (glyceraldehyde-3-phosphate dehydrogenase) used for the internal control.

[0144] According to these results, malignant mesothelioma cells are believed to express hardly any IL-6 receptor. Since the pleural fluid in cases of malignant pleural mesothelioma consists of bloody pleural fluid, soluble IL-6 receptor is surmised to be present in large amounts, and this is believed to...

example 3

Induction of VEGF Production by IL-6 Stimulation (1)

[0145] Tumor cells of malignant mesothelioma cell lines H2052 and H2452 were cultured in three series in 24-well plates at an initial cell concentration of 5×104 / well in RPMI1640 medium. On the following day, the cell culture liquid was replaced followed by commencement of stimulation by (1) recombinant IL-6 (10 ng / ml), (2) recombinant IL-6 (10 ng / ml)+recombinant soluble IL-6R (100 ng / ml), and (3) inhibition by the anti-IL-6 receptor antibody, humanized PM-1 antibody (refer to WO 92 / 19759) (25 μg / ml) (RPMI was used for the medium control). After culturing for an additional 3 days, the concentrations of vascular endothelial growth factor (VEGF) in the culture supernatants were measured using the Quantikine Human VEGF Immunoassay Kit (R & D Systems) and corrected for the amount of cellular protein.

[0146] Those results are shown in FIG. 3. As is clear from these graphs, production of VEGF was inducted by IL-6 stimulation in both cel...

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Abstract

The present invention provides a mesothelioma therapeutic agent containing an interleukin-6 (IL-6) antagonist such as antibody to IL-6 receptor (IL-6R), and a mesothelioma cell growth inhibitor containing an IL-6 antagonist such as antibody to IL-6R.

Description

TECHNICAL FIELD [0001] The present invention relates to a novel mesothelioma therapeutic agent and mesothelioma cell inhibitor. BACKGROUND ART [0002] Mesothelioma is a tumor that occurs in the mesothelium that covers the surface of the pleura, peritoneum and pericardium that respectively envelop the organs of the chest cavity such as the lungs and heart, and abdominal organs such as the digestive tract and liver. In the case of diffuse pleural mesothelioma, chest pain is caused by invasion of the intercostals nerves on the side of the chest wall pleura, and respiratory and circulatory disorders may occur due to tumor growth and accumulation of pleural fluid in the pleura on the organ side (Takagi, Journal of Clinical and Experimental Medicine, (March Supplement), “Respiratory Diseases”, pp. 469-472, 1999). There is eventually proliferation into the adjacent mediastinal organs, progressing to direct invasion of the heart or development into the abdominal cavity by means of the diaphr...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K39/395A61K45/06C07K16/24C07K16/28
CPCA61K45/06C07K16/248C07K16/2866C07K2316/96C07K2317/24C07K2317/73C07K2317/76A61P35/00A61P43/00A61K39/395
Inventor NISHIMOTO, NORIHIROKISHIMOTO, TADAMITSUADACHI, YASUOTAKAYAMA, KOICHI
Owner CHUGAI PHARMA CO LTD
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