Antibodies act an important role in the diagnosis of diseases

We all know from school biology class, antibodies help us fight disease and it is an important part of our immune system. However, what many people don't know is that doctors and scientists using animals’ antibodies to identify diseased or mutant cells. It makes them an important tool for the diagnosis of diseases like cancer.

1. Binding function

Antibodies are formed in certain blood cells in response to the substances that the immune system classifies them hazardous. These so-called antigen is the location of the molecule, e.g., on the surface of the virus or bacteria. Again, the antibody binds an epitope of an antigen known as certain areas. Thus, their immune system is the signal to reduce these foreign binding.

This combination of characters is also helpful in the diagnosis: in immunohistological or immunohistochemical procedures insertion of some structure to the antibody, such as proteins, can be seen. "Since the 1970s, these programs have been used and continue to improve and expand," says Jürgen Frerichs, the head of DIANOVA GmbH, one of the established commercial enterprises in the sector.

2. The antibody targeted synthesis

In short, biotechnology companies and research institutions produce antibodies by injecting a specific antigen into a mouse, sheep or horses. Subsequent immune response can stimulate the body to produce a lot of characteristics with the antigen-binding antibodies. Then they are separated from the blood of the antibodies directly, or even to isolate specific antibody-producing blood cells extracted from a mixture of certain animals and start a complicated biotechnology processes for the production of an excess of a single antibody. Such antibodies produced are called "monoclonal" - they just issued in conjunction with a particular epitope from a single cell.

Antibodies are very small, even a microscope is not easy to see. That's why they are specially prepared for diagnosis. They combine to produce visible colorant or labeled with a fluorescent colorant enzymes. There are two ways: direct and indirect techniques. The latter works in conjunction with the first one (primary antibody) to add the bridge by another antibody (secondary antibody).

3. The antibody helps to distinguish tumor cells from each other

One example is the anti IDH1 R132H DIANOVA GmbH monoclonal antibody clone H09, wherein different brain tumors can be distinguished from each other. Originally developed by the famous German Cancer Research Center, the antibody labels glioma accounts for about 20% of all brain tumors. Glioma brain tumor differentiation from other makes launch targeted treatment and help predict the course of the disease.

4. In contrast to gene sequencing, they show multiple advantages

In using antibodies offer many advantages compared to molecular biology method for diagnosis, particularly in the diagnosis of brain tumors, when there are often fewer organizations. In addition, tissue samples in the percentage of tumor cells are a key factor. Immunohistochemistry appears to be much faster and cheaper than gene sequencing.

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Scientists study ultrasound healing for peripheral nervous system

Biomedical Engineering Laboratory is investigating the ultrasonic stimulation of the peripheral nervous system as a technology of human organs for treatment.

Peripheral nervous system connected to the central nervous system is an array of neural connections - the brain and spinal cord - and all the other organs and functions in the body. The basic function of the peripheral nervous system that includes the human autonomic functions, such as heart muscle provisions, voluntary skeletal muscles and sensory organs, such as visual and auditory.

DARPA, through its electronic prescription or ElectRx program designed to explore the use of the peripheral nervous system stimulation, improve physical and mental health. The agency hopes to develop a better scientific knowledge behind the cause invasive stimulation of peripheral nerves, to encourage the natural healing function in the human body technology. ElectRx award results from the feedback control of proof of concept demonstrations neuromodulation.

Colombia team, led by biomedical engineering professor Elisa's Konofagou, being studied as part of this strategy over stimulating role. The most well-known in the medical ultrasound imaging techniques, such as fetal echocardiography image and to view heart shape and motion. The technology is also used for conventional therapies, such as breaking up scar tissue or kidney stones.

Konofagou advanced features ultrasound laboratory investigations, including imaging, treatment, and drug delivery systems through the blood-brain barrier. In this project, Konofagou and Colombian engineering and medical colleagues will determine whether ultrasound can produce concentrated nerve stimulation of peripheral organ specific delivery of therapeutic signal. Expected results between the wearable devices went mid-thigh saphenous nerve stimulation, responsible for skin feel.

"We know that, as the ultrasonic wave propagation through biological tissue," Konofagou said in a university statement. “It exerts mechanical pressure on that tissue, which stimulates specific mechanosensitive channels in neurons and causes them to ‘turn on.’ So we think that this is a way we can use ultrasound to turn specific nerves ‘on’ or ‘off’ depending on what the treatment calls for.”

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Photo-bioelectrochemical cells used to develop new way of turning solar energy into electrical power

According to a study published in the journal Nature Energy, a new paradigm for the development of photo-bioelectrochemical cells is developed by researchers from The Hebrew University of Jerusalem, in Israel, and the University of Bochum, in Germany. This design of photo-bioelectrochemical cells is based on native photosynthetic reaction, and it is considered as a means for the conversion of solar light energy into electrical power and attracts substantial recent interest.

Photosynthetic reaction is coupled to biocatalytic transformations resulting in CO2 fixation and O2 evolution. Although the integration of native photosystems with electrodes for light-to-electrical energy conversion has been successful, the conjugation of the photosystems to enzymes to yield photo-bioelectrocatalytic solar cells is still a problem.

Recently, researchers shows the construction of photo-bioelectrochemical cells using the native photosynthetic reaction and the enzymes glucose oxidase or glucose dehydrogenase in a new report. The system consists of modified integrated electrodes that introduce the natural photosynthetic reaction center which is known as photosystem I, conjugated to the enzymes glucose oxidase or glucose dehydrogenase. The native proteins are electrically wired by means of chemical electron transfer mediators. Photoirradiation of the electrodes leads to the generation of electrical power, while oxidizing the glucose substrate acting as a fuel.

A model is provided by this system to harness the native photosynthetic apparatus for the conversion of solar light energy into electrical power, using biomass substrates as fuels. On the contrary, this study introduces the implementation of the native photosystem to produce electrical power using light as the energy source. The results of the study offer a general way of assembling photo-bioelectrochemical solar cells with wide implications for bioelectrocatalysis sensing, and solar energy conversion.

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Are antibiotics really safe as we usually think?

When people get cold or flu, they are commonly given antibiotics by doctors. But colds, flu, sinus congestion and cough are usually the symptoms of upper respiratory infections caused by viruses typically. Antibiotics aren't effective against viral infections but bacteria. Taking antibiotics may make you at risk if you don't need them, for they can drastically intestines' normal and protective intestinal flora, thus leaving you deficient and at risk of getting more infections.

Not long ago, a research on antibiotics shows that a person who takes a single regimen of antibiotics for ten days is more likely to get another infection then normal people. It is because that antibiotics often kill off too much of the host’s inherent beneficial flora, making the host more dangerous in the fight against new infections agents.

In a general way, infections are typically caused by being viruses, bacteria and fungi. Virus includes the flu, common cold and Aids. Bacteria infections include strep throat, bladder infections and ear infections. Although antibiotics such as sulpha and penicillin can kill bacteria, they create abnormal, cell-wall deficient bacterial forms that can embed deeper into your intestinal mucosa. This explains why taking antibiotics makes you more dangerous for future infections. With every dose of an antibiotic, you also increase the potential incidences of resistant, “super forms” of bacteria. Fungal infections are the diseases like tinea pedis (athlete’s foot) and cryptococcal meningitis which is a type of meningitis. Antifungal drugs often show a lot of negative side effects and won't be effective on those people who have a weakened immune system.

Partly because of the extensive side effects of many drugs including antibiotics, taking properly prescribed medical drugs was listed as the third leading cause of death, according to a study published in the Journal of the American Medical Association. People should be aware that antibiotics may be quite toxic and even deadly sometimes.

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The mutations at specific positions lead to instability at E22P and L34P stalled the aggregation of the peptide

Alzheimer's disease is a neurodegenerative disease that affects memory loss and is unable to continue to stimulate the brain, is the most common cause of dementia elderly (65+) delayed and less common in childhood Response (65 years ago) early onset, is divided into two phases. The disease prevalence extension of time, loss of memory deterioration, which hindered every aspect of everyday life. Personality and behavior changes affect social interaction and social environment of the trouble. Stirring, extraction, as well as memory loss and skills are appropriate result in death due to other infections, such as pneumonia, malnutrition, common symptoms of early-onset cases account for less than 5% in. Gene responsible for the disease is APP, which provides instructions for the preparation of the brain and spinal cord of a protein called amyloid precursor protein. Although the researchers envision that it can be combined with each other and pathogenesis mechanism attached to the surface of cells or help other several proteins remains a mystery. Several enzymatic cleavage of amyloid precursor protein into two smaller fragments or peptide amyloid precursor protein (APP) and β-amyloid peptides, which are released into the cell. β-amyloid peptide is likely involved in neuronal change and adapts over time (plasticity) capabilities.

In the APP gene mutation is responsible for the same accounting more than 50 kinds of different types of mutations, leading to early and late onset of the disease, some of which will be discussed later. The most common mutations are V717I leading to β-amyloid accumulation in the brain and form clumps called amyloid plaques and thus release of 40, 42 residues of Aβ peptide β-amyloid peptide. Six APP gene mutations has been found to cause hereditary cerebral amyloid angiopathy and characterized stroke and intellectual function (dementia), which began in the middle of the fall adult conditions. Dutch type, the most common of all types, is replaced by the amino acid glutamine and glutamic acid protein sequence (Glu22Gln or E22Q) caused by the position 22. Italian style and also cause changes in the Arctic-type glutamic acid at position 22. In Italy type, glutamic acid is replaced with lysine (Glu22Lys or E22K), and type in the Arctic, the amino acid glycine, glutamic acid substitution (Glu22Gly or E22G ). Flemish type substitution from alanine amino acid glycine section 21 (Ala21Gly or A21G) caused. It is switched to the amino acid asparagine at position 23 (or Asp23Asn D23N) in Iowa type amino acid aspartic acid. Piedmont type of hereditary cerebral amyloid angiopathy is replaced by the amino acid leucine at amino acid valine (Leu34Val or L34V) position 34 caused. These mutations lead to aggregation and β-amyloid peptide (1-42) in the brain prone to deposition, the formation of clusters and thus is known as plaque buildup in blood vessels leading to dementia.

In the recent study, the mutations were reported using NAMD and their deviation (RMSD) of molecular dynamics simulation, analysis and use of chimeras generate plots. The mutation leads to the formation of β fibers (α- helix into β fold) use stability PASTA2.0 mutant peptides were predicted using mutation analysis tools as PolyPhen 2.0 and I-3.0 mutants compared analysis wild-type β-amyloid peptide.

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Deleting the Dicer DNA-Repair Enzyme makes cancer cells more sensitive to chemotherapeutic drugs

Blocking the Dicer enzyme's activity in rapidly growing cancer cells holds back them from correct DNA damage, which makes them more sensitive to chemotherapeutic drugs.

Dicer, also known as endoribonuclease dicer or RNA helicase enzymes with motifs, is an enzyme, the gene encoding the human subject DICER1. As part of a family of RNA III enzyme, Dicer cleavage of double-stranded RNA (dsRNA) and pre-micro RNA (miRNA precursor) into short double-stranded RNA fragments called small interfering RNA and micro RNA, respectively. In 2012, it found that, in addition to its effect on RNA, DNA damage repair enzymes have played a direct role.

Link to expand the results of DNA repair enzyme Dicer, researchers at the University of North Carolina (Chapel Hill, USA) Delete Dicer medulloblastoma, pediatric brain tumors in preclinical mouse models of common types, and from normal, rapidly dividing cells in the developing brain cerebellum.

They reported in the December 31, 2015 in online edition of the journal Cell that in the developing mouse cerebellum missing enzyme Dicer cause DNA damage, leading to the accumulation of cerebellar degeneration ancestors. Dicer deficiency disorders also lead to DNA damage and other rapidly dividing cell death, including embryonic stem cells and mouse models of medulloblastoma in malignant cerebellar progenitor cells. In the enzyme-deficient mice with medulloblastoma, tumor burden is lower than the control animals, and the cancer cells more sensitive to chemotherapy.

"This is the first enzyme of DNA damage in a specific function in brain development has been looked at or even in the case of brain tumors, despite the fact that the protein has been studied extensively," said senior author Dr. De Ximu Mohanish g, University of North Carolina professor of cell biology and physiology. "We have found that targeting enzymes may be an effective treatment to prevent the development of cancer or any tumor actually sensitive to chemotherapy. We are pleased to see these results because hint Dicer enzyme inhibitors, can be developed for the treatment of rapid potential therapeutic dividing tumor samples of medulloblastoma."

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Study on the FE-binding Protein's Amino Acid Preference

Metal elements are widely used in the biosphere. Metal ions can be combined with protein in many biological fields to implement a variety of important functions. All organisms require trace metal ions, among the proteins which have been found, more than a third of them must be combined with a metal ion as a cofactor, or contain a metal binding site. Among them, the iron must be in vivo, which is the most abundant transition metal ion. Redox reaction can take place in iron. Iron has two kinds of oxidation state - divalent and trivalent, which is widely involved in various biochemical reactions.

Besides, the iron can also be combined with proteins in the form of the cofactor. Through the analysis of tendentious the distribution of protein sequences of amino acids and short peptides distribution， and through mining and analysis the pattern of information of iron-binding proteins, researchers could explore the biological and evolutionary information.

It is quite important to explore the sequence features iron-binding protein, mainly from the point of view of ferritin, research content through theory and methods of bioinformatics, combined with computer science and metals group technologies to further explore ways to ferritin binding sites and sequences.

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