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Related Concept Videos

Integrins01:10

Integrins

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Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM.
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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
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Skin cancer is a type of cancer that occurs when there is an abnormal growth of skin cells, usually triggered by damage to the DNA within the skin cells. It is primarily caused by exposure to ultraviolet (UV) radiation from the sun or artificial sources like tanning beds. Skin cancer is the most common type of cancer worldwide, and its incidence continues to rise.
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Non-LTR Retrotransposons03:18

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As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
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Related Experiment Video

Updated: Mar 7, 2026

A 3D Organotypic Melanoma Spheroid Skin Model
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Altered integrin expression patterns shown by microarray in human cutaneous melanoma.

Laura Vizkeleti1, Timea Kiss, Viktoria Koroknai

  • 1aDepartment of Preventive Medicine, Faculty of Public Health bMTA-DE Public Health Research Group, University of Debrecen, Debrecen, Hungary.

Melanoma Research
|February 25, 2017
PubMed
Summary
This summary is machine-generated.

Melanoma metastasis involves complex molecular changes, with integrins playing a key role. Specific gene pathways, like adhesion and immune signaling, differentiate regional and distant melanoma spread.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Melanoma progression is driven by numerous molecular pathways, indicating no single alteration is solely responsible.
  • Understanding the molecular basis of metastasis is crucial for effective melanoma treatment.

Purpose of the Study:

  • To identify and characterize the molecular alterations underlying melanoma metastasis formation.
  • To differentiate molecular changes associated with regional versus distant melanoma spread.

Main Methods:

  • Gene expression profiling using microarray and qRT-PCR on matched primary and metastatic melanoma cell lines.
  • Integration of data with publicly available unmatched tissue datasets.
  • Matrigel invasion assays and selection of invasive clones to assess cell line invasiveness.
  • Development of specific metastatic cell line models for regional and distant spread.

Main Results:

  • The majority of metastasis-associated genes were downregulated, with enrichment in adhesion and integrin alpha-6/beta-4 (ITGA6-B4) pathways.
  • Upregulation of immune pathways characterized distant metastases, while increased Rap1 signaling was specific to regional metastases.
  • qRT-PCR analysis indicated the importance of integrins ITGA3/4 and ITGB8 in distinguishing regional and distant metastasis.

Conclusions:

  • Integrin expression patterns are significant in distant melanoma metastasis formation.
  • Distinct molecular pathways, including adhesion, immune signaling, and Rap1 signaling, are involved in melanoma metastasis to regional and distant sites.