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Related Concept Videos

Introduction to Connective Tissues01:11

Introduction to Connective Tissues

19.9K
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,...
19.9K
Connective Tissue Cell Types01:22

Connective Tissue Cell Types

4.4K
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...
4.4K
Classification of Connective Tissues01:30

Classification of Connective Tissues

20.7K
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....
20.7K
Loose Connective Tissue01:26

Loose Connective Tissue

11.2K
Loose connective tissue is found between many organs. Its main function is to absorb shock and bind tissues together. It also allows water, salts, and various nutrients to diffuse into cells that are embedded in it or present in adjacent tissues.
Adipose Tissue
Adipose tissue consists primarily of fat storage cells called adipocytes and little extracellular matrix. A large number of capillaries present within adipose tissue allow rapid mobilization of lipid molecules. White adipose tissue is...
11.2K
Overview of Connective Tissues Proper01:25

Overview of Connective Tissues Proper

14.3K
Connective tissue proper is a class of connective tissue that encompasses all mature connective tissues except bone, cartilage, blood, and lymph. This extensive class of tissues has two subclasses — loose and dense connective tissues — classified based on the protein fiber arrangement and the amount of ground substance. 
The loose connective tissues have a meshwork of thin collagen and elastin fibers, which provide tensile strength for support and enough elasticity to move...
14.3K
Connective Tissue Fibers and Ground Substance01:17

Connective Tissue Fibers and Ground Substance

36.6K
One of the significant functions of connective tissue is connecting tissues and organs. Unlike epithelial tissue that is composed of cells closely packed with little or no extracellular space in between, connective tissue cells are dispersed in a matrix. The matrix usually includes a large amount of extracellular material produced by the connective tissue cells that are embedded within it. It plays a significant role in the functioning of this tissue. The major component of the matrix is a...
36.6K

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Related Experiment Video

Updated: Mar 17, 2026

Technique of Conjunctival Biopsy and Direct Immunofluorescence for Diagnosing Mucous Membrane Pemphigoid
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Mixed connective tissue disease.

Ragnar Gunnarsson1, Siri Opsahl Hetlevik2, Vibke Lilleby1

  • 1Rheumatology Unit, Oslo University Hospital Rikshospitalet, Oslo, Norway.

Best Practice & Research. Clinical Rheumatology
|July 17, 2016
PubMed
Summary

Mixed Connective Tissue Disease (MCTD) is a rare autoimmune disorder diagnosed by U1 snRNP antibodies and specific symptoms. Research highlights its genetic links, clinical features, and ongoing questions about anti-RNP-associated diseases.

Keywords:
DermatomyositisGeneticsInterstitial pulmonary fibrosisMixed connective tissue diseaseMyositisPolymyositisPulmonary hypertensionSystemic lupus erythematosusSystemic sclerosisU1 small nuclear ribonucleoprotein

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Area of Science:

  • Rheumatology
  • Immunology
  • Genetics

Background:

  • Mixed Connective Tissue Disease (MCTD) is a distinct autoimmune disorder recognized for over 40 years.
  • Diagnosis requires high U1 snRNP antibody titers and specific clinical manifestations like Raynaud's phenomenon and puffy hands.
  • MCTD is the least common connective tissue disease (CTD), with low prevalence and incidence rates.

Purpose of the Study:

  • To provide an updated review of MCTD's clinical, immunological, and genetic aspects.
  • To explore the relationship between MCTD and other CTDs.
  • To discuss recent therapeutic advances, prognosis, and prognostic factors, particularly concerning severe complications.

Main Methods:

  • Review of existing literature on MCTD.
  • Analysis of epidemiological data on MCTD prevalence and incidence.
  • Examination of genetic studies, focusing on human leukocyte antigen (HLA) linkage.

Main Results:

  • MCTD diagnosis is characterized by U1 snRNP antibodies and specific clinical features.
  • Epidemiological data indicates MCTD is the least common CTD.
  • Genetic studies confirm a strong human leukocyte antigen (HLA) linkage in MCTD, differentiating it from other CTDs and healthy controls.

Conclusions:

  • MCTD is a distinct CTD with specific diagnostic criteria and a strong genetic component.
  • Further research is needed to address unresolved questions regarding anti-RNP-associated diseases and their management.
  • Understanding prognostic factors is crucial for managing severe pulmonary and cardiovascular complications.