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Plakins are large proteins with binding domains for microtubules, microfilaments, intermediate filaments, and membrane-associated protein complexes at cell junctions. Plakin functions are evolutionarily conserved and are primarily involved in organizing the different components of the cytoskeleton by crosslinking them to each other and connecting them to the cell-matrix and cell adhesion complexes. They are also known to interact with signal transducers, serve as scaffolds for signaling...
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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
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The term desmosome derives from the Greek words "desmo" and "soma" meaning "adhesion bodies." This structure was first observed during the late 1800s and described as small, dense nodules in the epidermis. Desmosomes are button-like structures that help form an interlinked network of intermediate filaments across the cells. These junctions are  essential to hold cells together under mechanical stress and to maintain tissue integrity. Desmosomes are multi-protein...
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Dermis
The dermis might be considered the "core" of the integumentary system, as distinct from the epidermis and hypodermis. It contains blood and lymph vessels, nerves, and other structures, such as hair follicles and sweat glands. The dermis is made of two layers of connective tissue that comprise an interconnected mesh of elastin and collagenous fibers, produced by fibroblasts.
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The skin is divided into epidermis, dermis, and hypodermis, the skin's outermost, middle, and inner layers. The human epidermal layer regularly undergoes renewal, where old, dead cells are replaced by new cells. Epidermal stem cells or EpiSCs divide and differentiate to restore the lost cells. For the renewal process, some EpiSCs continuously self-renew. In contrast, few others differentiate into transit-amplifying cells, which later form prickle or spinous cells, followed by granular...
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Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
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Plectin in Skin Fragility Disorders.

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Plectin, a key protein for skin cell stability, can cause fragility when mutated or targeted by antibodies. This review covers plectinopathies, their skin and systemic effects, and future research directions.

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Area of Science:

  • Cell biology
  • Dermatology
  • Molecular genetics

Background:

  • Plectin is a large protein crucial for cytoskeletal organization and cell signaling.
  • It links intermediate filaments to hemidesmosomes, maintaining keratinocyte mechanical stability.
  • Plectinopathies arise from mutations in the PLEC gene or autoantibodies against plectin.

Purpose of the Study:

  • To review the cutaneous manifestations of plectinopathies.
  • To discuss the systemic involvement in various plectin-associated disease subtypes.
  • To summarize plectin's roles in skin cells and outline future research avenues.

Main Methods:

  • Literature review of plectinopathies.
  • Analysis of known functions of plectin in keratinocytes and fibroblasts.
  • Synthesis of current understanding and future perspectives.

Main Results:

  • Plectin mutations or autoantibodies lead to skin fragility and other disorders.
  • Plectin plays a vital role in keratinocyte mechanical integrity.
  • Systemic manifestations vary depending on the specific plectinopathy subtype.

Conclusions:

  • Plectin is essential for skin health, and its dysfunction causes significant disease.
  • Understanding plectin's roles is key to developing treatments for plectinopathies.
  • Further research is needed to explore therapeutic strategies for plectin-associated skin disorders.