Gleevec could be novel therapeutic agent for type 2 diabetes

The cancer treatment drug Imatinib, otherwise known as Gleevec is approved to treat various forms of cancer, mostly notably chronic myeloid leukemia (CML). However, researchers have stumbled onto another possible use for it, curing type 2 diabetes.

The team--made up of scientists from the Scripps Research Institute in United States, South Korea-based company Hyndai Pharm Co., Ltd., the Seoul National University, and Ulsan National Institute of Science and Technology (UNIST)--has identified for the first time that, through control of PPARγ, Gleevec lowers the level of insulin resistance, thereby reducing the risk of both hyperglycemia and obesity.

Acording to the team, led by Prof. Jang Hyun Choi (School of Life Sciences) of UNIST, "Although TZD-based medicines work effectively at improving glucose uptake by skeletal muscle and other peripheral tissues, due to increased risk of adverse effects they have been withdrawn from the market ." He continues, "In order to develop new type of medication that have fewer side effects, we have have discovered a new compound that can maintain stable blood sugar levels."

Among insulin-sensitizing drugs, TZDs are a therapeutic class that are selective agonists for PPARγ, which plays a central role in how the body metabolizes glucose, stores fat, and controls immune and inflammatory responses.

In the study, the team observed that the phosphorylation of PPARγ is closely related to developing diabetes. They also discovered that the removal of phosphoric acid from PPARγ shows anti-diabetic effects. To determine whether phosphoric acid is bound to PPARγ, the team developed a new chemical screening procedure. Using high throughput phosphorylation screening, the team discovered that Gleevec blocks CDK5-mediated PPARγ phosphorylation devoid of classical agonism as a PPARγ antagonist ligand.

Prof. Choi states, "Although studies have shown that Gleevec treatment may show improved insulin sensitivity and decrease blood glucose in patients with known diabetes, the exact cause hasn't been proven yet." He continues, "Through this research, we discovered Gleevec, which is used in leukemia medications, can inhibit the phosphorylation of PPARγ."

Gleevec could be novel therapeutic agent for type 2 diabetes

Low doses of imatinib drug can push immune system to combat bacterial infections

In contiuation of my update on Imatinib

Low doses of the anti-cancer drug imatinib can spur the bone marrow to produce more innate immune cells to fight against bacterial infections, Emory researchers have found.

The results were published March 30, 2015 in the journal PLOS Pathogens.

The findings suggest imatinib, known commercially as Gleevec , or related drugs could help doctors treat a wide variety of infections, including those that are resistant to antibiotics, or in patients who have weakened immune systems. The research was performed in mice and on human bone marrow cells in vitro, but provides information on how to dose imatinib for new clinical applications.

"We think that low doses of imatinib are mimicking 'emergency hematopoiesis,' a normal early response to infection," says senior author Daniel Kalman, PhD, professor of pathology and laboratory medicine at Emory University School of Medicine.

Ref : http://journals.plos.org/plospathogens/article?id=10.1371/journal.ppat.1004770

Low doses of imatinib drug can push immune system to combat bacterial infections

Biotechdaily - Nilotinib Enhances Toxic Protein Removal from Parkinson's Disease Neurons

In continuation of my update on Nilotinib

The anticancer drug nilotinib induces clearance of the toxic protein alpha-synuclein from   neurons in a mouse model of Parkinson's disease and ameliorates symptoms of the disease.

Investigators at Georgetown University Medical Center (Washington DC, USA) worked with a mouse model of Parkinson’s disease. They reported in the May 10, 2013, online edition of the journal Human Molecular Genetics that lentiviral transfection of the gene encoding alpha-synuclein into the mouse SN lead to activation (phosphorylation) of the tyrosine kinase Abl and that lentiviral transfection of the gene encoding Abl increased alpha-synuclein levels, which exacerbated the disease. Administration of the tyrosine-kinase inhibitor nilotinib decreased Abl activity and increased autophagic clearance of alpha-synuclein into lysosomes in transgenic and lentiviral gene-transfer models.

The drug nilotinib was approved as Tasigna in the USA and the EU for drug-resistant chronic myelogenous leukemia (CML). In 2006, a Phase I clinical trial found that nilotinib had a relatively favorable safety profile and showed activity in cases of CML resistant to treatment with imatinib (Gleevec [USA]/ Glivec [Europe, Australia, and Latin America]), another tyrosine kinase inhibitor currently used as a first-line treatment. In that study, 92% of patients (already resistant or unresponsive to imatinib) achieved a normal white blood cell counts after five months of treatment.

In the current study, nilotinib, which enters the brain within [US] Food and Drug Administration approved doses, led to autophagic degradation of alpha-synuclein, protection of SN neurons and improvement of motor performance in the Parkinson’s disease mice.

 
"No one has tried anything like this before," said senior author Dr. Charbel E-H Moussa, assistant professor of neuroscience at the Georgetown University Medical Center. "This drug, in very low doses, turns on the garbage disposal machinery inside neurons to clear toxic proteins from the cell. By clearing intracellular proteins, the drug prevents their accumulation in pathological inclusions called Lewy bodies and/or tangles, and also prevents amyloid secretion into the extracellular space between neurons, so proteins do not form toxic clumps or plaques in the brain."

"The doses used to treat CML are high enough that the drug pushes cells to chew up their own internal organelles, causing self-cannibalization and cell death," said Dr. Moussa. "We reasoned that small doses—for these mice, an equivalent to 1% of the dose used in humans—would turn on just enough autophagy in neurons that the cells would clear malfunctioning proteins, and nothing else. We successfully tested this for several diseases models that have an accumulation of intracellular protein. It gets rid of alpha-synuclein and tau in a number of movement disorders, such as Parkinson's disease as well as Lewy body dementia."

Biotechdaily - Nilotinib Enhances Toxic Protein Removal from Parkinson's Disease Neurons

FDA Approves Gleevec for Children with Acute Lymphoblastic Leukemia

In continuation of my update on Gleevec

FDA Approves Gleevec for Children with Acute Lymphoblastic Leukemia

New drug, regorafenib overcomes resistance in patients with rare sarcoma, study suggests

In continuation of my update on regorafenib

A new targeted drug demonstrated its ability to control metastatic gastrointestinal stromal tumor, an uncommon and life-threatening form of sarcoma, after the disease had become resistant to all existing therapies, report investigators at Dana-Farber Cancer Institute who led the worldwide clinical trial.

The oral drug regorafenib (see structure), which inhibits several cancer-promoting kinase enzymes, was able to control GIST for nearly four months longer than placebo in patients for whom Gleevec and Sutent were no longer effective, a result that was highly significant statistically.

"When added to best supportive care, regorafenib significantly improves disease control, as measured by progression-free survival time in patients with GIST after progression which represents failure of all other therapies," said George Demetri, MD, of Dana-Farber, principal investigator of this clinical trial.

Demonstrating the aggressive nature of this resistant disease, the study found that tumors objectively grew in less than a month, on average, in GIST patients who were initially randomized to receive a placebo. The study's "cross-over" design made it possible to treat those patients whose tumors grew, and 85 percent of the patients initially on placebo were able to receive regorafenib, which then controlled the disease in these patients as well.

Because of the study's cross-over design, Demetri said, it was not expected to prove that the patients initially randomized to receive regorafenib survived longer -- the researchers would have had to withhold the drug from the placebo patients to demonstrate that difference. "But there is no question that people are living longer" with regorafenib treatment, he said, based on the results of this trial.

An application to have regorafenib approved for use in resistant GIST is under an accelerated review by the Food and Drug Administration, Demetri said.

New drug overcomes resistance in patients with rare sarcoma, study suggests

FDA Approves Gleevec for Expanded Use in Patients with Rare Gastrointestinal Cancer

In continuation of my update on imatinib...

FDA Approves Gleevec for Expanded Use in Patients with Rare Gastrointestinal Cancer: The U.S. Food and Drug Administration today granted Gleevec (imatinib) regular approval for use in adult patients following surgical removal of CD117-positive gastrointestinal stromal tumors (GIST). Today’s action also highlights an increase in...

Nilotinib more efficiant over Imatinib for (Ph+ CML)....

Nilotinib (see structure) :

Nilotinib, in the form of the hydrochloride monohydrate salt, is a tyrosine kinase inhibitor, approved as Tasigna in USA and the EU for drug - resistant chronic myelogenous leukemia (June 2006), resistant to treatment with imatinib (Gleevec), another tyrosine kinase inhibitor currently used as a first-line treatment.

In a recently held large clinical trial, nilotinib demonstrated greater efficacy over the current gold standard treatment, imatinib, in adult patients with newly diagnosed Philadelphia chromosome-positive chronic myeloid leukaemia (Ph+ CML) in the chronic phase.

As per the claim by the researchers, in the first head-to-head study of these two oral treatments as initial therapy for this life-threatening leukaemia, nilotinib demonstrated statistically significant improvement over imatinib in key measures of effectiveness used in the trial. The trial showed that at 12 months, significantly fewer patients on nilotinib 300mg twice-daily progressed from the initial chronic phase of the disease to the later accelerated or blast crisis phases than those on imatinib 400mg once-daily. This demonstrates that nilotinib provided significantly better control of the disease compared to imatinib.

95% of patients with CML have an abnormality known as the Philadelphia chromosome. This chromosome produces a type of protein called Bcr-Abl, which is responsible for the overproduction of the cancerous white blood cells that are the main feature in Ph+ CML. Nilotinib is a potent and selective inhibitor of the Bcr-Abl protein, thereby inhibiting the production of these cancerous cells.

Ref : http://www.novartis.com/newsroom/media-releases/en/2009/1359764.shtml

Imatinib for the treatment of Scleroderma ?

We know that Imatinib (its mesylate salt, Novartis) is a drug used to treat certain types of cancer. It is used in treating chronic myelogenous leukemia (CML), gastrointestinal stromal tumors (GISTs) and a number of other cancers. It is the first member of a new class of agents that act by inhibiting particular tyrosine kinase enzymes, instead of non-specifically inhibiting rapidly dividing cells.

More over the discovery of this compound itself is interesting & its one drug obtained via, High Throughput Screening (HTS). Chemists used a HTS of chemical libraries to identify the molecule 2-phenylaminopyrimidine. This lead compound was then tested and modified by the introduction of methyl and benzamide groups to give it enhanced binding properties, resulting in imatinib. More interesting part of this drug is a recent discovery, i.e., GLEEVEC^® (imatinib mesylate) can be used to treat Scleroderma. As per the claim by the researchers, until now no drug has been shown to be effective in treating scleroderma in a clinical trial. Several years ago, a small study provided some evidence that a chemotherapy drug called cyclophosphamide may help scleroderma patients, but the benefit was minimal and this drug causes side effects including infertility and secondary cancers.

The investigators reported an interim analysis of their results, although the study is ongoing. At one year, the investigators saw a 23 percent improvement in skin scores. The researchers also saw an improvement in forced vital capacity scores by 9.6 percent and diffusion capacity scores by 11 percent in the 18 patients who had completed one year of treatment. The lung function data was really exciting,” Dr. Spiera said. “In patients with scleroderma, you usually see lung function tests getting worse over time, and if doctors try a therapy for a year and a patient doesn’t get any worse, we get pretty excited. What is amazing to me in this study is that we actually saw improvements in both lung function tests. Congrats for this remarkable achievement.....

Ref : http://www.hss.edu/newsroom_drug-provide-treatment-scleroderma.asp