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Connective Tissue Cell Types

Connective Tissue Cell Types

Connective tissue develops from the mesoderm of a developing embryo and consists of cells, fibers, and ground substance: a gel-like material containing large complexes of carbohydrates and proteins. Connective tissue was first identified as a separate tissue family in the 18th century, and Johannes Peter Muller coined the term connective tissue.
Fat cells (adipocytes), smooth muscle cells (myoblasts), and bone cells (osteoblasts) are some connective tissue cell types. Some immune system cells...

Introduction to Connective Tissues

Introduction to Connective Tissues

Connective tissues are one of the four main tissue types in humans that are extensively present in the body. They are characterized by cells embedded in an extracellular matrix (ECM) composed of a ground substance and three main types of protein fibers— collagen, elastic, and reticular fibers. The ground substance of connective tissues can range from a watery and jelly-like consistency to mineralized and hard. The wide variety of cells in the connective tissues include fibroblasts, osteocytes,...

Classification of Connective Tissues

Classification of Connective Tissues

The connective tissues have different properties and functions in the human body. They are broadly categorized into proper, supporting, or fluid connective tissues.
Connective Tissue Proper
Connective tissue proper is the most abundant class of connective tissues. As its name implies, it predominantly connects different tissues in the body. Depending on the cell types, ground substance, viscosity, and fiber types in the ECM, connective tissue proper is further categorized into loose and dense.

Cystic Fibrosis: Pathogenesis

Cystic Fibrosis: Pathogenesis

Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
CF is primarily caused by a genetic mutation in a chromosome 7 gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The most common gene mutation leading to CF is the ΔF508 mutation, but...

Sex Linked Disorders

Sex Linked Disorders

Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.

Embryonic Connective Tissues

Embryonic Connective Tissues

During early development, the embryo forms two types of connective tissues— the mesenchyme and mucoid connective tissue.
The mesenchyme is the first connective tissue that emerges in the developing embryo. It consists of loosely arranged multipotent mesenchymal cells and reticular fibers in the extracellular matrix. This loose arrangement allows easy migration of cells, which is essential for germ layer positioning, patterning, and organ morphogenesis during embryonic development. Mesenchyme is...

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Skin Biopsy for Diagnosing Discoid Lupus Erythematosus

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Identifying heritable connective tissue disorders in childhood.

Kate Armon¹, Peter Bale

¹Norfolk and Norwich University Hospital NHS Foundation Trust, Norwich, UK.

The Practitioner

|August 25, 2012

Summary

Heritable connective tissue diseases, though rare individually, present a significant diagnostic challenge as a group. Key features include joint hypermobility, affecting musculoskeletal, ocular, and cardiovascular systems.

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Isolation of Human Lymphatic Endothelial Cells by Multi-parameter Fluorescence-activated Cell Sorting

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Area of Science:

Genetics and rare diseases
Rheumatology and orthopedics
Cardiology and ophthalmology

Background:

Heritable connective tissue diseases (HCTDs) are rare, affecting 1-10 per 100,000 individuals.
Collectively, HCTDs pose a significant diagnostic challenge due to their varied presentations.
These disorders primarily impact the musculoskeletal, ocular, and cardiovascular systems.

Observation:

Ligamentous laxity and joint hypermobility are cardinal features across many HCTDs.
Symptoms include arthralgias, effusions, and increased risk of soft tissue injury.
Marfan syndrome, Ehlers-Danlos syndromes, and Osteogenesis imperfecta exemplify diverse HCTD phenotypes.

Findings:

Marfan syndrome, an autosomal dominant disorder, presents with tall stature, skeletal deformities, myopia, and cardiac abnormalities.
Ehlers-Danlos syndromes involve skin hyperextensibility, joint hypermobility, and tissue fragility due to collagen defects.
Osteogenesis imperfecta is characterized by low bone mass and increased fracture susceptibility.

Implications:

Early diagnosis and multidisciplinary assessment are crucial for managing HCTDs.
Echocardiographic follow-up is essential for identifying cardiac complications.
Symptom management and joint protection are vital for improving quality of life in affected individuals.