seminario molecular..! cms & lml
DESCRIPTION
Jung-Hyun Park, Yoon Mi Jin, Soojin Hwang, Du-Hyong Cho, Duk-Hee Kang, Inho JoTRANSCRIPT
Uric acid attenuates nitric oxide production by decreasing the
interaction between endothelial nitric oxide synthase and calmodulin in human umbilical vein endothelial cells: A mechanism for uric
acid-induced cardiovascular disease development
Jung-Hyun Park, Yoon Mi Jin, Soojin Hwang, Du-Hyong Cho, Duk-Hee Kang, Inho Jo
Carolina Mora SánchezLaura María Moreno León
INTRODUCTION
Cardiovascular Disease CVD’s
Are a group of disorders of the heart and blood vessels
Are the number one cause of death globally
Can be prevented by addressing risk factors.
>Coronary heart disease. >Cerebrovascular disease.
INTRODUCTION
INTRODUCTION
Uric Acid
INTRODUCTION
Most uric acid dissolves in blood and travels to the kidneys, where it passes out in urine. We can use uric acid levels in the diagnosis different pathologies
Is the end product of purine metabolism in humans
In normouricemic humans, the daily production and ingestion of uric acid is well balanced by the daily excretion
INTRODUCTION
hyperuricemia is associated with hypertension cardiovascular diseases.
Uric Acid
INTRODUCTION
Nitric Oxide NO eNOS is responsible for most of the vascular NO produced.
That increased blood flow by dilating blood vessels
Is a gas and is an important protective molecule in the
vasculature
INTRODUCTION
eNOS
Dysregulation contributes to the pathogenesis of certain diseases Dimerization.
Interaction with calmodulin (CaM) and tetrahydrobiopterin (BH4), Acetylation Phosphorylation.
eNOS is regulated by
INTRODUCTION
Calmodulin CaM
Mediates the control of a large number of enzymes, ion channels and other proteins by Ca2+.
Is a calcium-binding messenger protein expressed in all eukaryotic cells.
Among the enzymes to be stimulated by the calmodulin-Ca2+ complex are a number of protein kinases and phosphatases.
INTRODUCTION
Specific tissue
Bovine aortic endothelial cells (BAEC)
Human umbilical vein EC (HUVEC)
Human plasma and aortic EC – in vitro
Pulmonary artery EC
INTRODUCTION
eNOS CaM in EC
Uric Acid eNOS activity
NO production
Reducing the binding between
GENERAL OBJECTIVE
Explain how uric acid decreases NO production by direct modulations on eNOS, leading to causing cardiovascular problems.
MATERIALES & MÉTODOS
Reactivos
Ácido úrico
eONS bovina recombinante
eNOS, p-eNOS-Thr 495, p-eNOS-Ser1177, p-eNOS- Ser114
Calmodulina recombinante
Fluo-4 AM
Ig CaM
FBS
M200 Ig Lisina acetilada
LSGS DPBS NCS L-glutamina
Penicilina y estreptomicina
MEM
Tripsina EDTA
MATERIALES & MÉTODOS
Cultivo Celular
Método para el estudio del comportamiento de las células, muy adecuado como modelo para el estudio del desarrollo y la diferenciación, por lo que las líneas celulares que conservan la capacidad de diferenciarse
MATERIALES & MÉTODOS
Medición de ON
La producción de ON es medida como concentración de nitrito en la células cultivadas.
MATERIALES & MÉTODOS
Medición de la actividad de la eONS
La cuantificación de la actividad de eNOS se lleva a cabo midiendo la conversión de L-arginina en L citrulina, en presencia de concentraciones saturantes de los cofactores enzimáticos adecuados.
MATERIALES & MÉTODOS
Medición de la actividad de la Xantina oxidasa
Se mide mediante la aparición de
su producto ácido úrico.
MATERIALES & MÉTODOS
Western Blot
Proteínas procedentes de extractos celulares son separados por electroforesis en gel según su tamaño kDa
Técnica: SDS-PAGE policrámida en la que son disueltas en una solución, con el detergente sodio duodecil sulfato.
MATERIALES & MÉTODOS
Ensayo in vitro
Manipulación que se hace con células o sistemas aislados de
células, en el laboratorio con los que se trata de simular las condiciones
que tendrían en los organismo de los que fueron aislados
MATERIALES & MÉTODOS
Canmunoprecipitación
Es una técnica popular para identificar las interacciones proteína-proteína
fisiológicamente relevantes mediante el uso de anticuerpos para determinar la presencia de una proteína específica.
MATERIALES & MÉTODOS
Dimerización
The chemical reaction that
joins two
molecular subunits,
resulting in the formation of
a single dimer.
MATERIALES & MÉTODOS
Arginasa
Es una enzima del ciclo de la urea que cataliza la hidrólisis de la arginina,
produciendo ornitina y urea.
MATERIALES & MÉTODOS
RT-PCR
Amplificación de RNA a través de la síntesis previa de su cDNA (DNA copia),
utilizando una transcriptasa inversa, seguida de varios ciclos de PCR
convencional.
Determinar expresión genética en diversos tejidos.
RESULTADOS
RESULTADOS
RESULTADOS
RESULTADOS
RESULTADOS
RESEARCHER COMMENT AGREE DISAGREE
D.I Feing
¨Epidemiology studies showed that higher blood level of uricacid is significantly associated with the risk of cardiovascular diseases¨.
X
DISCUSSION
RESEARCHER
COMMENT AGREE DISAGREE
I. Papeziková
¨Most recentstudy revealed that uric acid decreased NO production, both indirectlyand directly; by increasing arginase activity and decreasingeNOS-Ser1177 phosphorylation, respectively¨.
X
DISCUSSION
RESEARCHER COMMENT AGREE DISAGREE
C. Nathan
¨CaM is one of the key proteins for eNOS activation. AlthoughCaM binds tightly to eNOS, even at the resting basal levels of intracellularCa2+ levels¨.
X
DISCUSSION
RESEARCHER COMMENT AGREE DISAGREE
J. White
¨increased intracellular Ca2+ byextrastimuli such as ionomycin induced more association of CaMwith eNOS¨.
X
DISCUSSION
• Uric acid inhibits the production of nitric oxide which is a vasodilator important for the prevention of heart disease
• This project can help people to understand how if they do not have healthy habits can cause cardiovascular disease.
CONCLUSIONS
• Ionomycin is used in research to raise the intracellular level of calcium, this help the interaction between eNOs y CaM.
• Uric acid reduced the interaction between CaM and eNOS this produces a disminusion of the production of NO.
CONCLUSIONS
Carolina Mora Sánchez