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Pathol Res Pract. 2012 Jul 15;208(7):377-81. doi: 10.1016/j.prp.2012.04.006. Epub 2012 Jun 8.
The influence of physical activity in the progression of experimental lung cancer in mice
Renato Batista Paceli 1, Rodrigo Nunes Cal, Carlos Henrique Ferreira dos Santos, José Antonio Cordeiro, Cassiano Merussi Neiva, Kazuo Kawano Nagamine, Patrícia Maluf Cury
- PMID: 22683274
- DOI: 10.1016/j.prp.2012.04.006
Impact_Fator-wise_Top100Science_Journals
GRUPO_AF1 – GROUP AFA1 – Aerobic Physical Activity – Atividade Física Aeróbia – ´´My´´ Dissertation – Faculty of Medicine of Sao Jose do Rio Preto
GRUPO AFAN 1 – GROUP AFAN1 – Anaerobic Physical Activity – Atividade Física Anaeróbia – ´´My´´ Dissertation – Faculty of Medicine of Sao Jose do Rio Preto
GRUPO_AF2 – GROUP AFA2 – Aerobic Physical Activity – Atividade Física Aeróbia – ´´My´´ Dissertation – Faculty of Medicine of Sao Jose do Rio Preto
GRUPO AFAN 2 – GROUP AFAN 2 – Anaerobic Physical Activity – Atividade Física Anaeróbia – ´´My´´ Dissertation – Faculty of Medicine of Sao Jose do Rio Preto
Slides – mestrado – ´´My´´ Dissertation – Faculty of Medicine of Sao Jose do Rio Preto
CARCINÓGENO DMBA EM MODELOS EXPERIMENTAIS
DMBA CARCINOGEN IN EXPERIMENTAL MODELS
Avaliação da influência da atividade física aeróbia e anaeróbia na progressão do câncer de pulmão experimental – Summary – Resumo – ´´My´´ Dissertation – Faculty of Medicine of Sao Jose do Rio Preto
https://pubmed.ncbi.nlm.nih.gov/22683274/
Abstract
Lung cancer is one of the most incident neoplasms in the world, representing the main cause of mortality for cancer. Many epidemiologic studies have suggested that physical activity may reduce the risk of lung cancer, other works evaluate the effectiveness of the use of the physical activity in the suppression, remission and reduction of the recurrence of tumors. The aim of this study was to evaluate the effects of aerobic and anaerobic physical activity in the development and the progression of lung cancer. Lung tumors were induced with a dose of 3mg of urethane/kg, in 67 male Balb – C type mice, divided in three groups: group 1_24 mice treated with urethane and without physical activity; group 2_25 mice with urethane and subjected to aerobic swimming free exercise; group 3_18 mice with urethane, subjected to anaerobic swimming exercise with gradual loading 5-20% of body weight. All the animals were sacrificed after 20 weeks, and lung lesions were analyzed. The median number of lesions (nodules and hyperplasia) was 3.0 for group 1, 2.0 for group 2 and 1.5-3 (p=0.052). When comparing only the presence or absence of lesion, there was a decrease in the number of lesions in group 3 as compared with group 1 (p=0.03) but not in relation to group 2. There were no metastases or other changes in other organs. The anaerobic physical activity, but not aerobic, diminishes the incidence of experimental lung tumors.
Copyright © 2012 Elsevier GmbH. All rights reserved.
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Building a Better Research Mouse
Posted on 3/25/2019 by Eugene Marino, Marketing Manager
For the past 100 years, mice have been the primary model for biomedical research. Not only are they easy to keep and reproduce, mice have significant similarities to humans both genetically and physiologically.
With genetic manipulation, scientists have been able to create mouse models for many human diseases and conditions, enabling them to study the causes and progression of those diseases to develop new methods of diagnosis and treatment.
Inbred vs Outbred Mice
Traditionally, scientists have utilized mouse models from a population of inbred lab mice with a limited number of genetically engineered mutations. The thinking has been that using inbred mice creates a more genetically uniform animal model, but researchers are discovering that those limitations may be negatively affecting the outcomes of their work.
Not only are inbred mice potentially limiting the effectiveness of scientific research, they may not even offer the limited variability that is the primary reason for their use.
In a study published in Nature Methods in November 2018, researchers at McGill University analyzed previous scientific studies that used both inbred and outbred mice and determined that inbred mice display the same amount of variability in physical and behavioral traits as outbred mice. The study determined that because outbred mice tend to be generally healthier and easier to breed, they might make better biomedical research subjects in many applications.
Now, several groups are developing new mouse populations to more closely match the genetic variability of humans and more accurately simulate how certain diseases, and their potential treatments, work in humans.
Mouse Models for Alzheimer’s Disease
One of the biggest reason for the push to create better mouse models is Alzheimer’s. Mice do not naturally contract Alzheimer’s, but they can be genetically engineered to produce high levels of human amyloid protein plaques in the brain, which is one of the markers of the disease.
Despite the plaque buildup, traditional mouse models of Alzheimer’s do not display the memory issues that are the primary hallmark of Alzheimer’s, and drugs that have been effective at removing the plaques in mice have not improved memory issues in Alzheimer’s patients. In more than 400 human trials for potential treatments for Alzheimer’s disease, the vast majority have been ineffective, and only a few drugs have been FDA-approved to treat cognitive issues related to Alzheimer’s.
The problem may be that amyloid plaques are only one factor in the development of Alzheimer’s, and that the symptoms humans with Alzheimer’s normally display are the result of amyloid plaques in combination with other genetic factors.
The solution may lie in a different, outbred mouse model that more closely matches the way the human brain reacts to Alzheimer’s disease. In one experiment, researchers at Jackson Laboratory genetically modified both lab and wild mice to develop amyloid plaques. The lab mice displayed no memory problems, but some of the wild mice did.
That result, and several others, have led researchers to understand the need for new animal models with an expanded combination of genetic mutations. A consortium of researchers called MODEL-AD (Model Organism Development & Evaluation for Late-Onset Alzheimer’s Disease), which was established by the National Institute on Aging, was tasked with developing the next generation of in vivo mouse models for Alzheimer’s research. The group has already developed 30 new mouse varieties and will be presenting their results at the ADPD Annual Conference in Portugal March 26-31.
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