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Related Concept Videos

Type II Diabetes II: Pathophysiology01:24

Type II Diabetes II: Pathophysiology

PathophysiologyType 2 diabetes mellitus (T2DM ) is a chronic metabolic disorder characterized by insulin resistance and progressive pancreatic β-cell dysfunction, leading to impaired glucose homeostasis. It results from interactions among genetic predisposition, environmental factors, and metabolic stressors, such as overnutrition and a sedentary lifestyle.Insulin Resistance and Glucose DysregulationEarly T2DM involves insulin resistance in skeletal muscle, adipose tissue, and the liver.
Metastasis02:30

Metastasis

Metastasis is the spread of cancer cells from the original site to distant locations in the body. Cancer cells can spread via blood vessels (hematogenous) as well as lymph vessels in the body.
Epithelial-to-Mesenchymal Transition
The epithelial-to-mesenchymal transition or EMT is a developmental process commonly observed in wound healing, embryogenesis, and cancer metastasis. EMT is induced by transforming growth factor-beta (TGF-β) or receptor tyrosine kinase (RTK) ligands, which further...
Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...
Type II Diabetes I: Introduction01:26

Type II Diabetes I: Introduction

Type 2 diabetes mellitus (T2DM) is a chronic metabolic disorder characterized by insulin resistance, in which target tissues such as the liver, muscle, and adipose tissue respond poorly to insulin. It is also associated with inadequate compensatory insulin secretion, where pancreatic β-cells fail to produce sufficient insulin. Together, these abnormalities lead to persistent hyperglycemia.EtiologyT2DM develops through a complex interaction of genetic predisposition and environmental or...
Type I Diabetes II: Pathophysiology01:26

Type I Diabetes II: Pathophysiology

Type 1 diabetes mellitus arises from an immune-mediated destruction of pancreatic β-cells, resulting in an absolute deficiency of insulin. This process develops in genetically susceptible individuals when autoimmunity, environmental exposures, and immunologic dysregulation converge to trigger a targeted attack on the insulin-producing cells of the pancreas. The β-cells are located within the islets of Langerhans and are essential for regulating blood glucose by facilitating cellular uptake of...
Smooth Endoplasmic Reticulum01:21

Smooth Endoplasmic Reticulum

Smooth endoplasmic reticulum or smooth ER is a sub-organelle with specialized functions in animal cells and plant cells. It is often associated with the tubule morphology of the endoplasmic reticulum.
The ER provides optimal conditions for synthesizing steroid hormones and lipids, such as phospholipids and triglycerides. Traditionally, lipid metabolism was considered to be a smooth ER function. However, there is no direct evidence to prove that rough ER is completely excluded from lipid...

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Related Experiment Videos

Multiple endocrine neoplasia type 2.

Maya Lodish1

  • 1Section on Endocrinology and Genetics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA. lodishma @ mail.nih.gov

Frontiers of Hormone Research
|May 9, 2013
PubMed
Summary
This summary is machine-generated.

Multiple endocrine neoplasia type 2 (MEN2) is a genetic cancer syndrome caused by RET gene mutations. Understanding genotype-phenotype correlations aids in predicting and managing associated endocrine tumors like medullary thyroid carcinoma.

Related Experiment Videos

Area of Science:

  • Endocrinology
  • Oncology
  • Genetics

Background:

  • Multiple endocrine neoplasia type 2 (MEN2) is an autosomal-dominant cancer syndrome.
  • It is characterized by medullary thyroid carcinoma (MTC), pheochromocytoma (PHEO), and primary hyperparathyroidism (PHPT).
  • MEN2 includes subtypes MEN2A and MEN2B, with familial MTC considered a variant of MEN2A.

Purpose of the Study:

  • To review the genetic basis of MEN2, focusing on RET proto-oncogene mutations.
  • To discuss genotype-phenotype correlations for predicting associated endocrine neoplasms and MTC timing.
  • To summarize recent American Thyroid Association guidelines for MTC management.

Main Methods:

  • Review of scientific literature on MEN2.
  • Analysis of genotype-phenotype correlations in MEN2 patients.
  • Summary of current clinical guidelines for MTC management.

Main Results:

  • All MEN2 subtypes result from activating mutations in the RET proto-oncogene.
  • Specific RET mutations correlate with the risk and timing of MTC and other endocrine tumors.
  • Genotype analysis is crucial for risk assessment and personalized management strategies.

Conclusions:

  • Early recognition of germline RET mutations in at-risk individuals is vital for cancer prevention and management.
  • Understanding genotype-phenotype relationships improves the prediction of MEN2-associated malignancies.
  • Adherence to updated clinical guidelines is essential for optimal patient outcomes in MEN2.