Upload
laura-serna
View
47
Download
3
Embed Size (px)
Citation preview
Acelerated clinical course of prion desease in mice compromised in
repair of oxidative DNA damage.Clara M.O. Jalland, Sylvie L. Benestad, Cecilie Ersdal, Katja
Scheffler, Rajikala Suganthan. Yusaku Nakabeppu, Lars Eide, Magnar Bjoras, Michael A. Tranulis.
INTRODUCTION:
PRION
Infectious agent
Compossed by a modify protein
Are not living organisms
They could propagate
Acumulates in infected
tissues
Tissue damage and cell death
Misfolded protein
INTRODUCTION
• PRION REPLICATION:
DNA damages
DNA damages
Endogenous Endogenous
ExogenousExogenous Oxidation of bases
Oxidation of bases
Alquilation of bases
Alquilation of bases
Hydrolysis of bases
Hydrolysis of bases
Mismatch of bases
Mismatch of bases
GENERAL OBJECTIVE
OBSERVATE AND REPORT THE PROGRESSION OF EXPERIMENTAL PRION DISEASE IN MICE WITH
COMPROMISE DNA- REPAIR CAPCITY
MATERIALES Y METODOS
El estudio fue llevado a cabo en concordancia con el reglamento noruego sobre experimentación animal.
Aprobado por el comité de ética para experimentación con animales del instituto nacional de veterinaria de Noruega.
12 WILDTYPE
30 RATONES
18 TRANSGENICOS
Criterios de inclusión: ratones hembra que pesaran 20g al momento de la inoculación.
INOCULO:
Todos los ratones excepto los control
fuero inoculados con RML aislado.
Todos los ratones excepto los control
fuero inoculados con RML aislado.
DISEÑO EXPERIMENTAL:
Ratones Anestesiados e inoculados
Monitoreados Sacrificados
Extracción de órganos
Corte longitudinal del
encéfalo
Corte longitudinal del
encéfalo
Inmuno histoquímica
Inmuno histoquímica
Congelación del otro hemisferio
Congelación del otro hemisferioWestern BlotWestern Blot
PrPsc y GFAP
PrPsc y GFAP
PrPscPrPsc
INMUNOHISTOQUIMICA
Utilizada para identificar moléculas
especificas en cualquier clase de tejido, donde
hay una relación antígeno- anticuerpo. Esto se puede ver al
microscopio cuando se utiliza una reacción
colorante.
Utilizada para identificar moléculas
especificas en cualquier clase de tejido, donde
hay una relación antígeno- anticuerpo. Esto se puede ver al
microscopio cuando se utiliza una reacción
colorante.
INMUNOHISTOQUIMICA:
WESTERN BLOT:
Las proteínas procedentes de extractos celulares son separadas por
electroforesis, por medio de la técnica SDS-PAGE. Tras este proceso las proteínas se transfieren a un filtro
donde hay anticuerpos que reaccionan con la proteínas de
interés.
PCR EN TIEMPO REAL:
• Plataforma ideal para el desarrollo de pruebas moleculares para identificación y cuantificación de agentes infecciosos de interés clínico.
• Los procesos de amplificación y detección se realizan en simultanea.
RESULTADOS
RESULTADOS
RESULTADOS
DISCUSSION
AUTHOR WHAT DID HE SAY THEY ARE AGREE? YES OR NO
(Akhtar, S. et al. 2013 ;Tamguney, G. et al. 2008).
“Many previous studies have identified genetic elements that influence the incubation period of experimental prion disease”
YES
(Guentchev, M et al, 2002) The direct contribution of ROS to the pathogenesisof prion diseases is somewhat less explored; however, analysis of brain areas in humans affected by CJD showed increased levels of oxidative DNA damage
YES
DISCUSSION
AUTHOR WHAT DID HE SAY THEY ARE AGREE? YES OR NO
(Sandberg, M.K. et al 2011) “the morphological end-point of prion disease provides little information about the rapidity of clinical deterioration in the toxic phase of prion disease.”
YES
(Brown, D. R. et al. 1997 ; Brown, D. R et al. 2002).
“Interestingly, an antioxidant function has been ascribed to the cellular prion protein PrPC.”
YES
CONCLUSIONS
It is important with this article to see what the real effect of the ROS, Prion organism level and mainly they attack not only generate alterations in DNA but almost all components of the organism such as proteins, lipids, in the nucleus, mitochondria.
This item is important to note that ROS cause more damage to specific parts of the body such as the brain, considering that produces neurodegenerative diseases, it is important to sensitize the population on the production of ROS, which although they are synthesized by the organism inevitably, there are other situations that stimulate their production and can be avoided. Is important to note as the PRP may be a protective factor for susceptibility to oxidative stress.
CONCLUSIONS
• It is important to do these studies to elaborate on the alterations and diseases that can be triggered
starting with a mutation or alteration in DNA, since diseases are usually of great significance when they start there is no way to cure them and the only we can do is observe their progress
It is important to do these studies to elaborate on the alterations and diseases that can be
triggered starting with a mutation or alteration in DNA, since diseases are usually of great
significance when they start there is no way to cure them and the only we can do is observe
their progress
This article is useful because it allows us to recognize the natural mechanisms that make the
body to correct the errors caused by agents such as ROS in DNA, which in this case is injury escicion bases and genes are related in this repair as is
MUTYH and OGG1 and the severe impact that may have on the body if any of these suffers a failure,
usually producing tumor lesions.
This article is useful because it allows us to recognize the natural mechanisms that make the
body to correct the errors caused by agents such as ROS in DNA, which in this case is injury escicion bases and genes are related in this repair as is
MUTYH and OGG1 and the severe impact that may have on the body if any of these suffers a failure,
usually producing tumor lesions.
MAPA CONCEPTUAL:
MAPA CONCEPTUAL: