Tag Archives: Cancer

The Venom that Can Cure You

Imagine hearing the words from your doctor, “You have cancer,” then feeling relived that it wasn’t anything fatal. Yes, scientists in Africa have discovered that the venom from Polybia paulista (South American Wasp) can kill cancer.

The polybia paulista (South American Wasp) is found native to Brazil, Paraguay, and Argentina.

The university of Brazil have begun experimenting its effects on mice with areas of tumour and seeing hopeful results. After stings from the wasps, the size of  tumours of the mice visibly shrunk significantly. This is cause by the venom having a protein Polybia-MP1 that causes the rupture on the parts of the cell membrane with these fatty component, phosphatidylserine (PS) and phosphatidylethanolamine (PE). Cancerous cell, unlike normal cells, have these parts on the outer membrane, making them more susceptible. The venom will actively damage these parts of the cells and cause the cell to degrade.

The process in which the wasp venom kills the tumorous cells.

Reachers are excited in the discovery of such medication. There exists a saying in Chinese “以毒攻毒” meaning using poison to attack poison.  The venom used does have its drawbacks. Normal cells are still susceptible to the the degradation and prolonged exposure can kill the healthy cells as well. Prolonged exposure to these venom will cause the patient to die. Researchers are still studying ways to implement this technique without harming the patient.

Dr Paul Beales, from the University of Leeds, stated that drugs that attacked the lipid structure of the cancerous cell’s  membrane are a revolutionary type of drug. “This could be useful in developing new combination therapies,” as he was keen on using multiple ways to deal with the tumour at the same time to increase the efficiency and to decease the time the patient is in contact with venom.

“This early stage research increases our understanding of how the venom of the Brazilian wasp can kill cancer cells in the laboratory.” said Dr Aine McCarthy, the science information officer for Cancer Research UK. She along with many others are excited to hear and is looking forward to do more tests on this subject before it is available to treat patients.

– Steven Li

Killing the Ghosts: Beating Drug-Resistant Cancerous Cells

Rapid expansion of molecular biologists’ knowledge of how cancerous cells with damaged DNA sustain a long lifespan has helped us find new aggressive ways to wipe out cancer cells such as more effective chemotherapy. One key obstacle to tackle is the fact that cancerous cells quickly become resilient to DNA-harming medications. This leads to many chemotherapy failures.

A new research just appeared in Nature Structural and Molecular Biology  introduced an innovative method of dealing with death-evading cancerous cells by stripping these cells of their drug-resistance developing capabilities, more vulnerable to DNA damaging drugs hence.

Pancreatic cancer cells deficient in the expression of the human gene known as Schlafen 11 and resistant to chemotherapy (left panels) were re-sensitized to chemotherapeutic treatment (middle and right panels) by inhibiting the expression of the transfer RNA known as tRNA-Leu-TAA through specially designed antisense oligonucleotides. [Manqing Li, Michael David Lab, UC San Diego] (Genetic Engineering & Biotechnology News (GEN))

Built upon their prior works on HIV immunology, Professor Micheal David and Emeritus Professor Jean Wang from University of California (San Diego) say that a protein called Schlafen 11 stops the normal functions of the two vital proteins of cancerous cells, ATM and ATR. They explain that DNA damaging drugs activate Schlafen 11 which leads to cancerous cells death, and those cancerous cells which do not express Schlafen 11 simply survive the chemotherapy.  This study has a great potential for applications in immunology and virology, including HIV therapies, due to molecular mode of action of Schlafen 11.

David’s Lab further found out that, similar to the transfer RNA molecules of Schlafen 11, transfer RNA molecules of several gene families involved in DNA repair systems are encoded by transfer RNA gene rich in leucine amino acid. This provides a clue for making drug-resistant cancerous cells sensitive anew by attacking the transfer RNA molecules of DNA repair genes.

The findings show that disruption of normal functions of both ATR and transfer RNA could kill the cancerous cells combined with chemotherapy even though this technique could compromise whole DNA repair system. The paper also shows the role of cellular adjustments made in levels of transfer RNAs in survival or death of a cell with damaged-DNA for the first time.

by: Jamaledin Adel

https://www.nature.com/articles/s41594-018-0142-5?_ga=2.70392784.117150651.1540857600-2063335005.1540857600