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Home/ Authentic Science Research 2013-2014/ Contents contributed and discussions participated by Nicholas Scholz

Contents contributed and discussions participated by Nicholas Scholz

Nicholas Scholz

Severe Complications Related to Cancerous Brain Tissue - 0 views

  • About two-thirds of patients with brain metastases will have symptoms that can range from headache to vision problems to confusion
  • These metastases can lead to spinal cord compression, which in the most severe cases can cause permanent paralysis and/or incontinenc
  • Plexopathies cause pain and occur when cancer spreads to the plexus, a network of interweaving nerves, blood
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  • essels, or lymph vessel
  • h vessel
  • Cancer can also spread to the tissues that cover the brain and spinal cord, called the leptomeningeal tissues
  • There is a strong correlation between deep vein thrombosis and cancer: patients who present with deep vein thrombosis are more likely to be diagnosed with cancer
  • Paraneoplastic disorders are a group of conditions related only because they result from biological side effects of cancer
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    This essay explains the types of complications related to neurological conditions and how they effect the body. The first complication is of course related to the origination of brain tumors themselves. Brain metastases is caused by the spread of cancerous cells to brain from other areas of the body. Symptoms could include that of headaches to vision problems. The next topic of discussion is the Epidural Spinal Cord Compression. This is another type of metastases which can lead to spinal cord compression and possible paralysis. Common issues associated with this type of metastases include breast, prostate, or lung cancer. Additionally, Plexopathies are caused by the spread of cancer to the plexus. This type of complication causes serious pain and has the ability to migrate towards other areas of the plexus. Leptomeningeal Metastases is caused by the spread of cells to the tissues which cover the brain and spinal cord and could effect cognitive skills. Another complication is a vascular disorder. Vascular disorders and cancer are believed to correlate with a deep vein thrombosis. Finally, paraneoplastic disorder is a complication that is caused by a group of conditions which create biological side effects. These side effects include release of substances into the blood stream and inappropriate immune system responses.
Nicholas Scholz

Types of Brain Tumors and Their Origins - 0 views

  • Primary brain tumors originate in the brain itself or in tissues close to it
    • Nicholas Scholz
       
      The Mayo website contains a vast amount of information regarding brain tumors
  • Primary brain tumors begin when normal cells acquire errors (mutations) in their DNA
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  • Secondary (metastatic) brain tumors are tumors that result from cancer that starts elsewhere in your body and then spreads (metastasizes) to your brain
  • Secondary brain tumors most often occur in people who have a history of cancer
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    This article goes on to explain two different types of tumors and then states how they start to spread. One of the types of tumors is the primary brain tumor which originates in the brain itself. This type of tumor begins as normal cells mutate their DNA and grow rapidly across the brain. The other type of brain tumor is the Secondary or Metastatic brain tumor. This type of tumor is generally caused by a metastasis of cancerous cells from other organs of the body. Most often this type of tumor originates in areas such as the breast and the colon. Of these two types of brain tumors the metastatic seems to be much more common than the primary tumors.
Nicholas Scholz

How do Medical Professionals Diagnose Brain Tumors? - 0 views

  • The neurological exam includes checking vision, hearing, strength, sensation, balance, coordination, reflexes and ability to think and remember
  • An angiogram is a type of X-ray of the head that shows the brain’s arteries and veins
  • To show abnormalities like a brain tumor, a contrast dye is often used
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  • CT scans are a type of X-ray that creates a three-dimensional picture of the head by scanning the head from multiple different angles
  • CT scans can be helpful in diagnosing some types of brain tumors, especially those near or involving bone
  • DTIs measure the flow of water through the white matter tracts of the brain. This provides a snapshot of the brain's structure and can be used to compare changes over time.
  • This scan allows the surgeon and treating team to visualize the circuitry (or wiring) of the brain to guide the surgery
  • FMRI is used to determine the specific location of the brain where a certain function, such as speech or motor function, occurs
  • Patients can undergo functional MRIs (fMRI) to help delineate a roadmap of important structures (such as areas that control the arms, legs, or speech) prior to surgery
  • . These scans use magnetic fields and radio waves, rather than X-rays, and computers to create detailed pictures of the brain.
  • MRS is similar to MRI, except that it measures the function of the brain rather than its structure
  • A PET scan detects changes in cells as they grow
  • A biopsy is a surgical procedure to remove a small sample of the tumor for examination under a microscope
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    This article provides information regarding the diagnosis of brain tumors. The first step in diagnosing brain tumors is a neurological exam. This type of exam is used to check vision, hearing, strength, sensation, and other cognitive skills. If deemed necessary other exams can be performed to determine characteristics of the tumors. The first is an angiogram, which is a type of x-ray for the head which examines arteries and veins. The second type is a brain scan, which shows abnormalities using a contrast dye. Another type of scan is the CT scan which creates a 3 dimensional image of the brain which can be useful in diagnosing brain tumors especially near bones. Diffusion Tensor Imaging (DTI) is a type of scan which measures the flow of water through white matter of the brain. This method provides a snapshot of brains structure and can be very useful during surgical procedures allowing physicians a guide to the rest of the brain. An fMRI is used to determine specific locations related to specific functions. This type of diagnostic tool helps create a guide to specific functions of the brain which is used to better prepare for surgery. The common MRI uses a magnetic field and radio waves to create pictures of the brain. A similar MRS measures the function of the brain rather than its structure. Additionally, PET scans detect changes in the cells using an injection of radioactive glucose. Finally, the most effective way to diagnose a patient is by using a biopsy. A biopsy is a surgical procedure which a profile of tissue is collected and examined under a microscope. Most biopsy's are done using surgery, although there are a couple of different types of needle biopsy's.
Nicholas Scholz

Multiple Sclerosis - 0 views

  • Multiple sclerosis (or MS) is a chronic, often disabling disease that attacks the central nervous system (CNS)
  • MS is a disease that involves an immune system attack against the central nervous system (brain, spinal cord, and optic nerves)
  • Although MS is thought by some scientists to be an autoimmine disease, others disagree strongly because the specific target of the immune attack in MS has not yet been identified. For this reason, MS is referred to as an immune-mediated disease.
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  • As part of the immune attack on the central nervous system, myelin (the fatty substance that surrounds and protects the nerve fibers in the central nervous system) is damaged, as well as the nerve fibers themselves
  • The damaged myelin forms scar tissue (sclerosis
  • Relapsing-Remitting MS
  • People with this type of MS experience clearly defined attacks of worsening neurologic function. These attacks—which are called relapses, flare-ups, or exacerbations —are followed by partial or complete recovery periods (remissions
  • Primary-Progressive MS
  • This disease course is characterized by slowly worsening neurologic function from the beginning—with no distinct relapses or remissions
  • Secondary-Progressive MS
  • Following an initial period of relapsing-remitting MS, many people develop a secondary-progressive disease course in which the disease worsens more steadily, with or without occasional flare-ups, minor recoveries (remissions), or plateaus
  • Progressive-Relapsing MS
  • In this relatively rare course of MS (5%), people experience steadily worsening disease from the beginning, but with clear attacks of worsening neurologic function along the way
  • but the disease continues to progress without remissions.
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    Multiple sclerosis has been associated with attacks against the central nervous system. The immune system has been identified to targeting organs such as the brain, spinal cord, and optic nerves. It is known as an immune - mediated disease because there is no specific target that has been identified. The attacks by the immune system often damage myelin and create scarred tissue (sclerosis). Patients with multiple sclerosis could experience one of four courses identified with the disease. One course is the Relapsing-Remitting MS. In this course the patient experiences a severe attack on the CNS followed by remissions. The second course is known as the Primary-Progressive MS. In this course the central nervous system slowly deteriorates without any relapses or remissions. Another course of MS is the Secondary-Progressive MS. This form of MS generally follows the relapsing-remitting form of MS and progressively worsens the CNS with or without remissions and plateaus. The most rare form of MS is perhaps the Progressive-Relapsing MS. In this course of MS, patients generally experience a progressive worsening of neurological function, without any remissions.  
Nicholas Scholz

Treatments and Medications Used for Patients with MS - 0 views

  • Corticosteroids are mainly used to reduce the inflammation that spikes during a relapse
  • Beta interferons. These types of drugs — such as Avonex, Betaseron, Extavia and Rebif — appear to slow the progress of multiple sclerosis, reduce the number of attacks and lessen the severity of attacks
  • (Copaxone). This medication may reduce the number of MS attacks
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  • (Tysabri). This medication may reduce the number of MS attacks by interfering with the movement of potentially damaging immune cells from your bloodstream to your brain and spinal cord.
  • Teriflunomide (Aubagio). This oral medication reduces attacks and lesions in people with MS.
  • Medications such as amantadine may help reduce fatigue due to multiple sclerosis.
  • Dalfampridine (Ampyra). This oral medication may improve walking speed in some people. The major side effect is seizures.
  • Muscle relaxants. If you have multiple sclerosis, you may experience painful or uncontrollable muscle stiffness or spasms, particularly in your legs. Muscle relaxants such as baclofen (Lioresal) and tizanidine (Zanaflex) may improve muscle spasticity
  • A physical or occupational therapist can teach you stretching and strengthening exercises and show you how to use devices that can make it easier to perform daily tasks.
  • For example, stem cell transplantation is being studied. In a stem cell transplant, doctors inject healthy stem cells into your body to replace diseased stem cells.
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    Though MS obviously has no cure there are plenty of procedures and medications that can be used to lessen the effects of the disease. Treating specific attacks reduces the damage to the myelin sheath. Two methods for controlling the attacks are plasma exchanges and corticosteroids. Another way to control the effects of MS is by slowing the progression of the disease. There are many different drugs that slow the rate of relapses some of which include Beta Interferons, Copaxone, Gilenya, and Tysabri. In addition to these medications, other strategies can be used to treat the symptoms, which include physical therapy and muscle relaxants. 
Nicholas Scholz

Parkinsons DIsease - NIH - 0 views

  • Parkinson's disease (PD) belongs to a group of conditions called motor system disorders, which are the result of the loss of dopamine-producing brain cells
  • symptoms of PD are tremor, or trembling in hands
  • bradykinesia, or slowness of movemen
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  • As these symptoms become more pronounced, patients may have difficulty walking, talking, or completing other simple tasks
  • difficulty in swallowing
  • At present, there is no cure for PD
  • and progressive
  • A therapy called deep brain stimulation (DBS) has now been approved by the U.S. Food and Drug Administration
  • In some cases, surgery may be appropriate if the disease doesn't respond to drugs
  • movements called dyskinesias that are a common side effect of levodopa
  • PD is both chronic
  • Usually, patients are given levodopa
  • No one can predict which symptoms will affect an individual patient, and the intensity of the symptoms also varies from person to person.
  • PD research in laboratories at the National Institutes of Health (NIH)
  • Scientists looking for the cause of PD
  • develop new protective drugs that can delay, prevent, or reverse the disease.
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    This article pertains to the neurological disorder, Parkinson's Disease (PD). PD is known to reduce motor system function due to the loss of dopamine-producing brain cells. Most symptoms related to PD include tremors, trembling, and slowness of movement (bradykinesia). As the disease progresses these tremors begin to effect daily activities like chewing and speaking. Unfortunately there is no cure for Parkinson's Disease. The most common treatment for PD is the use of medications such as levodopa. Due to complications with current medications other treatments like deep brain stimulation and surgery are commonly used. Parkinson's Disease is both chronic and progressive. Tremors and other symptoms will occur for long periods of time and possibly grow worse. Patients with PD experience varying symptoms and intensities. Current research being done in response to Parkinson's is being conducted at the National Institute of Health (NIH) and elsewhere. Current topics of research include discovering the cause of PD, and the development of protective drugs needed to delay, prevent, and even reverse the disease.
Nicholas Scholz

Alzheimer's - Alzheimer's Association - 0 views

  • Alzheimer's is a type of dementia that causes problems with memory, thinking and behavior.
  • Alzheimer's disease accounts for 50 to 80 percent of dementia cases.
  • Up to 5 percent of people with the disease have early onset Alzheimer's
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  • Those with Alzheimer's live an average of eight years after their symptoms become noticeable
  • However, serious memory loss, confusion and other major changes in the way our minds work may be a sign that brain cells are failing.
  • Each nerve cell connects with many others to form communication networks
  • Keeping everything running requires coordination as well as large amounts of fuel and oxygen
  • Plaques are deposits of a protein fragment called beta-amyloid (BAY-tuh AM-uh-loyd) that build up in the spaces between nerve cells.
  • Tangles are twisted fibers of another protein called tau (rhymes with “wow”) that build up inside cells.
  • It's the destruction and death of nerve cells that causes memory failure, personality changes, problems carrying out daily activities and other symptoms of Alzheimer'
  • Ninety percent of what we know about Alzheimer's has been discovered in the last 15 years
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    Alzheimer's is actually a common form of dementia. Roughly 50-80 percent of patients with dementia are associated with Alzheimer's. Alzheimer's is considered a neurological disorder with loss of memory, thinking and behavioral function. Alzheimer's is common diagnosed in patients 65 and older with the exception of patients with Early-Onset Alzheimer's. Alzheimer's progressively worsens over time and commonly culminates in death 8 years after symptoms start to arrive. Again no cure has been found for alzheimer's, but certain medications are used to treat symptoms. A build-up of plaques and tangles in the brain is suspected to kill nerve cells and cause a loss of brain function. The loss of nerve cells causes gaps in the communication network and eventually causes a loss of function in those areas of the brain. Although scientists do not know their exact role in Alzheimer's, patients have been associated with an abundant amount of these abnormal structures.
Nicholas Scholz

Epilepsy - NIH - 0 views

  • The epilepsies are a spectrum of brain disorders ranging from severe, life-threatening and disabling, to ones that are much more benign
  • normal pattern of neuronal activity becomes disturbed, causing strange sensations, emotions, and behavior
  • Epilepsy may develop because of an abnormality in brain wiring, an imbalance of nerve signaling chemicals called neurotransmitters
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  • Only when a person has had two or more seizures is he or she considered to have epilepsy
  • For about 70 percent of those diagnosed with epilepsy,
  • seizures can be controlled with modern medicines and surgical techniques
  • Issues may also arise as a result of the stigma attached to having epilepsy
  • the risk of seizures restricts their independence (some states refuse drivers licenses to people with epilepsy) and recreational activities.
  • Ongoing research is focused on developing new model systems that can be used to more quickly screen potential new treatments
  • Researchers funded by the National Institutes of Health have developed a flexible brain implant that could one day be used to treat seizures
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    Epilepsy is a neurological disorder associated with sudden seizures. In diagnosing epilepsy, the patient must have displayed two unexpected seizures. Epilepsy can be life - threatening and disabling or benign. Typical symptoms associated with epilepsy are strange sensations, emotions, and behavior. The cause of epilepsy is uncertain, but abnormal brain wiring may have an effect. With no cure for epilepsy, modern day medications and surgeries are used to treat patients. Due to the stigma associated with epilepsy, some children develop behavioral and emotional issues. The restriction of independence, like being denied a drivers license due to seizures, is also emotionally challenging for these patients. Current research being conducted for patients with epilepsy include the development of new models used to determine treatments, and brain implants which control seizures. 
Nicholas Scholz

The effects of the brain in reproduction - 1 views

  • Properly functioning FSH (Follicle Stimulating Hormone) is needed to ensure fertility
  • Recently, the group of researchers at the University of Muenster (Germany) has analysed genetic variants in both the FSH gene and in the FSH receptor, which affect fertility in both males and females.
  • The group found that a distinct single nucleotide change in the DNA structure of FSHB gene (the FSH molecule has 2 subunits -- FSHB is the B subunit) caused significant effects in the functioning of the hormone in both men and women
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  • They found that males with the FSHB variation had significant drops in FSH levels and in testicular volume
  • However, the number of women with the combined variation so far studied was not high enough to draw significant conclusions.
  • We estimate that around 45% of infertile men would respond to FSH therapy
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    Reproduction is obviously a vital aspect of the human development. With a non-functioning fertility system future generations would be at a loss. Many problems could arise with infertility and ground-breaking research is finally being conducted. One of the important aspects of human reproduction is the use of hormones specifically FSH (Follicle Stimulating Hormone). This hormone is produced at the base of the brain stem and non-existing levels of FSH were recently associated with infertility. In order to regenerate these hormones a change has to be made in the FSHB subunit of the nucleotide. Infertility usually occurs after certain changes are made in the hormone levels and by redirecting the levels of hormones we may be able to alter the problems that arise during reproduction. It should also be noted that increases and decreases in the levels of FSH may have different effects depending on the gender of the patient. Current research estimates that the response of males to this therapy could positively effect nearly 45% of infertile men. Estimates could not be made for females as a result of insufficient research. 
Nicholas Scholz

Predicting the Spread of Brain Tumors Using Modern Day Biotechnology - 0 views

  • ISOpure uses a set of tumor expression profiles and a panel of healthy tissue expression profiles to generate a purified cancer profile for each tumor sample, and an estimate of the proportion of RNA originating from cancerous cells
  • samples pre-selected to have a high cancerous cell content using pathological estimates [20-23], thereby introducing variability into expression profiles that cannot be removed by current computational pre-processing methods
  • he challenge of computational purification is to decompose each tumor profile tn (a vector of length G) into its component cancer profile (the vector cn), and normal profile
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  • Computational purification of tumor expression profiles by ISOpure improves the accuracy of subsequent prognostic models for lung and prostate cancer by reducing inter-sample variation in the amount and type of gene expression signal in the tumor profile that is due to normal tissue contamination.
  • Our analysis demonstrated approximately 10% improvement in prediction of EPE when using ISOpure cancer profiles compared with the unpurified profiles.
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    Using the ISOpure computational purification tool, scientists and medical professionals can develop a prognosis and treatment plan for a certain cancer patients at a much quicker rate. The tool used in this process can help identify the cancerous tissue located in the organs and provide medical professionals further notice of the proportion of RNA originating from cancer cells allowing them to develop treatment plans ahead of time. ISOpure uses an algorithm which determines the proportion of RNA in the organ(s). The real challenges of developing these treatments is of course extracting a portion of tissue with both a normal profile and a cancer profile to predict the spread of the disease. After this portion of tissue has been extracted the ISOpure modeling can process the data using simple MATLAB software. The success of this computational tool is noted to improve the prediction of extra-prostatic-extension (EPE) by 10% in cancer profiles compared to the unpurified models. 
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