segunda-feira, 10 de agosto de 2015

Pancreas endocrino

PANCREAS  ENDOCRINO

Informaçao geral



Textos









Absorçao e transporte da glicose


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The family of glucose transporters (GLUTs 1–5)

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GLICOSE TRANSPORTERS
Name
Tissue distribution
Important features
GLUT 1
Brain, erythrocytes, placenta, fetal tissue
Low Km* (~ 1 mM). Allows relatively constant uptake of glucose independent of the normal extracellular concentration (4–6 mM).
GLUT 2
Liver, kidney, intestine, pancreatic β-cell.
High Km (15–20 mM). Allows intracellular and extracellular glucose to equilibrate across membrane.
GLUT 3
Brain
Low Km (<1 mM) compared with GLUT2. Allows preferential uptake in hypoglycemia.
GLUT 4
Muscle and adipose tissue
Medium Km (2.5–5 mM). Insulin recruits transporters from intracellular stores increasing glucose uptake.
GLUT 5

Jejunum
Medium Km (~ 6 mM). Responsible for fructose uptak
                   










Anatomia do pancreas endocrino

This diagram shows the anatomy of the pancreas. The left, larger side of the pancreas is seated within the curve of the duodenum of the small intestine. The smaller, rightmost tip of the pancreas is located near the spleen. The splenic artery is seen travelling to the spleen, however, it has several branches connecting to the pancreas. An interior view of the pancreas shows that the pancreatic duct is a large tube running through the center of the pancreas. It branches throughout its length in to several horseshoe- shaped pockets of acinar cells. These cells secrete digestive enzymes, which travel down the bile duct and into the small intestine. There are also small pancreatic islets scattered throughout the pancreas. The pancreatic islets secrete the pancreatic hormones insulin and glucagon into the splenic artery. An inset micrograph shows that the pancreatic islets are small discs of tissue consisting of a thin, outer ring called the exocrine acinus, a thicker, inner ring of beta cells and a central circle of alpha cells.





Glucagina - fisiologia





























Ilheus de Langerhans
Islets are clusters of cells scattered throughout the pancreas, which include cells that sense sugar in the blood.


Insulina






























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Insulina – receptores

Effect of insulin on glucose uptake and metabolism. Insulin binds to its receptor (1), which, in turn, starts many protein activation cascades (2). These include: translocation of Glut-4 transporter to the plasma membrane and influx of glucose (3), glycogen synthesis (4), glycolysis (5), and fatty acid synthesis (6).


Somatoestatina



Informaçao especializada

Carcinoide do pancreas

Diabetes


Glucaginoma


Hiperinsulinismo

Hiperrinsulinismo congenito


Hiperproinsulinemia


 Hipoglicemia

Hipoglicemia cetosica


Hipoglicemia espontanea


Hipoglicemia reactiva


Hipoglicemia do stress


Insulinoma


Insulino resistencia

Nesidioblastose
Ver Hiperinsulinismo congenito

Ppomas

Somastatinomas

Tumores pancreaticos neuroendocrinos

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