Breaking News
June 24, 2018 - New tools could uncover important answers for Alzheimer’s researchers
June 24, 2018 - CytoReason builds largest reference of immune-focused inter-cellular communications
June 24, 2018 - Enlist a Pharmacist to Help Manage High Blood Pressure
June 24, 2018 - Genes found related to the reduction of proteins that contribute to Alzheimer’s onset
June 24, 2018 - 1 in 5 immigrant children detained during ‘zero tolerance’ border policy are under 13
June 24, 2018 - Personal automated cell lab assistant from Leica saves time with quality results
June 24, 2018 - Drug use can have social benefits, and acknowledging this could improve rehabilitation
June 24, 2018 - AMSBIO introduces MyEZGel 3D-iPSC Matrix for more accurate in vivo predictions
June 24, 2018 - RaySearch releases new RayStation 8A to expand support for TomoTherapy platform
June 24, 2018 - Dying cancer cells make remaining glioblastoma cells more aggressive and therapy-resistant
June 24, 2018 - Researchers discover new type of cell that hinders formation of fat cells
June 24, 2018 - Scientists develop unique program to predict a form of Parkinson’s disease
June 24, 2018 - Adult Obesity Prevalence Varies With Level of Urbanization
June 24, 2018 - Picking an exercise boot camp
June 24, 2018 - Researchers outline a connection between subplate neurons and brain disorders
June 24, 2018 - Four cups of coffee a day shown to protect heart muscle
June 24, 2018 - ‘Antifreeze’ molecules may hold key to better treatments for brain injuries
June 24, 2018 - Opening onsite health clinics for workers can cut health care costs
June 24, 2018 - Glooko to demonstrate new version of diabetes management mobile application at ADA meeting
June 24, 2018 - Florida Teen First Human Case of Another Mosquito-Borne Virus
June 24, 2018 - Blood type O patients may have higher risk of death from severe trauma
June 24, 2018 - New studies on molecular and cellular proteomics
June 24, 2018 - Algorithm predicts dangerous low blood pressure during surgery
June 24, 2018 - Herpes may play role in pathogenesis of Alzheimer’s
June 24, 2018 - Inaccurate measurement of sodium intake may account for paradoxical results, study suggests
June 24, 2018 - Aquinnah Pharmaceuticals wins NINDS grant to advance novel therapies for ALS
June 24, 2018 - Study upends conventional view of opioid mechanism of action
June 24, 2018 - Floppy eyelids may be sign of sleep apnea, study finds
June 23, 2018 - Researchers highlight new nurse training model to address shortage of primary care
June 23, 2018 - New Olympus cellSens 2.1 speeds up image analysis
June 23, 2018 - Attitudes Among Obese Are Not Aligned With Healthy Living
June 23, 2018 - Early birds less prone to depression
June 23, 2018 - Scientists use novel approach to uncover how brain networks interact to make word-choice decisions
June 23, 2018 - Researchers discover shared genetic basis for psychiatric disorders
June 23, 2018 - Study shows fat cells increase in size and number upon exposure to fracking chemicals
June 23, 2018 - Water-limited landscapes can facilitate disease transmission
June 23, 2018 - Exercise May Ease Inflammation Tied to Obesity
June 23, 2018 - Is it their own fault?! How people judge the exclusion of others
June 23, 2018 - Researchers use advanced technology to identify proteomes of Th17 and iTreg cells
June 23, 2018 - Researchers develop low-cost plastic sensors to monitor wide range of health conditions
June 23, 2018 - Lipid-scrambling DNA enzyme outperforms naturally occurring counterpart, say researchers
June 23, 2018 - Apps for children should emphasize parent and child choice, researchers say
June 23, 2018 - Teenage girls report higher degree of daytime sleepiness than boys
June 23, 2018 - Protein Data Bank at Rutgers impacts research, education and drug discovery
June 23, 2018 - Study unravels new piece of information in the Huntington’s disease puzzle
June 23, 2018 - Scientists develop new device to test cancer drug combinations quickly and cheaply
June 23, 2018 - Neural Analytics wins CE Mark for NeuralBot System
June 23, 2018 - Infant omega-3 supplementation tied to decreased waist size
June 23, 2018 - Massive analysis of genomes reveals insights into genetic overlap among psychiatric diseases
June 23, 2018 - New therapeutic approach may delay neurodegeneration in rare genetic disease
June 23, 2018 - Broken shuttle protein may hinder learning in patients with brain disorders
June 23, 2018 - Study finds increase in daily cannabis use among American adults
June 23, 2018 - Researchers create electronic skin that brings back real sense of touch to prosthetic limbs
June 23, 2018 - FIRS: Guidance Offered for Protecting Youth From E-Cigarettes
June 23, 2018 - Scientists unravel molecular mechanisms of Parkinson’s disease
June 23, 2018 - When the Heart Stops, Drugs Often to Blame
June 23, 2018 - Scientists show that a key Parkinson’s biomarker can be identified in the retina
June 23, 2018 - Study finds factors underlying current rise in radicalization among European youth
June 23, 2018 - New study finds higher heart disease risk in bisexual men
June 23, 2018 - Coconut oil diet increases vitality, lifespan of fruit flies with peroxisomal disorder
June 23, 2018 - Jumping genes or transposons and their role in the genetic code
June 23, 2018 - The Current issue of “The view from here” is concerned with Therapeutics
June 23, 2018 - Abnormal lipid metabolism in fat cells predicts future weight gain and diabetes in women
June 23, 2018 - Alcohol problems linked to sex without condom use among black gay men
June 23, 2018 - DNA patterns in circulating blood cells can help identify spastic cerebral palsy
June 23, 2018 - Unsubstantiated health claims widespread within weight loss industry
June 23, 2018 - FDA grants marketing authorization for use of two catheter-based devices in hemodialysis patients
June 23, 2018 - An ingrown toenail not the same as a bypass
June 23, 2018 - Study suggests proteinuria lowering as important target in managing pediatric CKD
June 23, 2018 - Dynamic model helps make predictions about gut microbiome
June 23, 2018 - Research consortium wins £2.9 million to help tackle antibacterial resistance in Thailand
June 23, 2018 - Schizophrenia patients account for over 1 in 10 suicide deaths, study shows
June 23, 2018 - Overdose risk increases five-fold with concurrent opioid and benzodiazepine use
June 23, 2018 - FDA Alert: Kratom (mitragyna speciosa) powder products by Gaia Ethnobotanical: Recall
June 23, 2018 - Study highlights inadequate effort of health care insurers to combat opioid epidemic
June 23, 2018 - CDC chief asks for, and gets, cut to his record $375K pay
June 22, 2018 - Novel cellular pathway may clarify how arterial inflammation develops into atherosclerosis
June 22, 2018 - Pioneering exercise program improves physical, mental health of elderly people living in care homes
June 22, 2018 - Rutgers Cancer Institute educates childhood cancer survivors about late effects of treatment
June 22, 2018 - Study tests accuracy of device designed to detect heart dysfunction in childhood cancer survivors
Cervical tumors may be vulnerable to therapies that attack cancer’s fuel supply, study shows

Cervical tumors may be vulnerable to therapies that attack cancer’s fuel supply, study shows

image_pdfDownload PDFimage_print

Cancer therapies have improved — in some cases dramatically — over the past two decades, but treatment for cervical cancer has remained largely unchanged. All patients receive radiation and chemotherapy, yet despite the aggressive approach, the regimen fails in about one-third of patients with cervical cancer that has spread beyond the cervix but not outside the pelvis.

Now, researchers at Washington University School of Medicine in St. Louis have shown that cervical tumors that don’t respond to radiation may be vulnerable to therapies that also attack the cancer’s fuel supply. Studying mice implanted with human cervical cancer cells, the investigators wiped out many of the animals’ tumors with a combination of radiation and three drugs that target tumor metabolism. They chose drugs that cut off the cancer’s ability to burn glucose and shut down protective processes that help cancer cells survive.

The study is published online in the journal Cancer Research.

“Cancer cell metabolism is a little bit peculiar,” said senior author Julie K. Schwarz, MD, PhD, an associate professor of radiation oncology. “Tumor cells take up glucose faster and in higher amounts than normal tissues. In past imaging studies, my colleagues and I noticed that cervical tumors that took up a lot of glucose prior to radiation treatment tended to be more resistant to radiation therapy than other tumors. If consuming a lot of sugar makes them resistant, we wondered what happens if we inhibit their sugar uptake.”

Schwarz and her colleagues used three different drugs, alone and in combination, to deprive cervical tumors of glucose and block downstream metabolic pathways that help protect cancer cells from building up toxic free radicals. Two of the drugs are investigational and approved by the Food and Drug Administration (FDA) for use in people as part of clinical trials; the third drug is FDA-approved to treat rheumatoid arthritis.

The researchers tested the drug combinations against four different human cervical cancer cell lines. One of the cell lines was vulnerable to being cut off from glucose alone, but the others needed more interference. All four cancer cell lines responded significantly to radiation plus the three-drug combination. One cell line was wiped out entirely. Schwarz and her team noted that the mice did not show obvious negative side effects of this therapy, likely because healthy cells don’t rely on one fuel production pathway.

When Schwarz and her colleagues cut off glucose, they force a cancer cell to scavenge for an alternative fuel. With the tumor in this vulnerable state, the researchers strike again by shutting down the cell’s ability to mitigate the toxic stew it creates from its own deranged metabolism. The treatment essentially forces the cell to drown in its own toxicity, according to the researchers.

“In many cases, when you cut off glucose alone, the cancer cells find ways to compensate,” said first author Ramachandran Rashmi, PhD, a staff scientist in radiation oncology. “But if you then hit their metabolic pathways in two more ways at the same time, the cell can’t recover from that. The stress from the toxic free radicals will escalate, eventually overwhelming the cell.”

Schwarz said that historically, cervical cancer is difficult to study in the lab because most cases are caused by human papillomavirus (HPV), and there is no equivalent infection in mice.

“Ninety to 95 percent of cervical cancer cases are HPV-related, and there are very few studies of this type of cancer in mice because HPV is a human virus,” Schwarz said. “It’s very difficult to produce a mouse model of a solid tumor of the type we see in most women who are diagnosed with cervical cancer. Even though this is a relatively rare cancer, we know HPV is important in a number of other tumors, including those of the head and neck. We believe what we learn from studying cervical cancer will help improve treatments for any HPV-driven cancer.”

Source:

Cutting off cervical cancer’s fuel supply stymies tumors

Tagged with:

About author

Related Articles