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Accessory Structures of the Skin: Sebaceous Glands01:21

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A sebaceous gland is a type of oil gland found almost all over the skin ( except palms and soles) and helps lubricate and waterproof the skin and hair. Most sebaceous glands are associated with hair follicles. They generate and excrete sebum, a mixture of lipids, onto the skin surface, thereby naturally lubricating the dry and dead layer of keratinized cells of the stratum corneum, keeping it pliable.
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After...
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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The pituitary is a small endocrine organ in the sphenoid bone under the hypothalamus. Primarily, the pituitary in adults has two distinct anatomical and functional regions— the anterior and posterior lobes. During human fetal development, a third pituitary gland region called the pars intermedia atrophies and disappears. However, some of its cells migrate and exist adjacent to the anterior pituitary in adults.
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The Parathyroid Glands00:59

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The two pairs of parathyroid glands embedded within the posterior surface of the thyroid gland are restricted by a dense capsule around them. These glands comprise two distinct cell populations—parathyroid oxyphil and parathyroid principal cells- pivotal in calcium homeostasis.
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MicroRNA and transcriptome analysis in periocular Sebaceous Gland Carcinoma.

John C Bladen1,2,3, Jun Wang4, Ajanthah Sangaralingam4

  • 1Centre for Cell Biology and Cutaneous research, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK. j.bladen@qmul.ac.uk.

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Summary

Sebaceous gland carcinoma (SGC) subtypes show distinct microRNA (miRNA) alterations. Identifying these specific molecular targets, like CD44, offers new avenues for treating this rare eyelid cancer.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Ophthalmology

Background:

  • Sebaceous gland carcinoma (SGC) is a rare, aggressive eyelid cancer.
  • SGC presents in nodular and more dangerous pagetoid subtypes.
  • Understanding molecular drivers is crucial for targeted therapies.

Purpose of the Study:

  • To identify key microRNAs (miRNAs) and their gene targets in different SGC subtypes.
  • To elucidate the distinct molecular mechanisms driving nodular and pagetoid SGC.
  • To uncover novel therapeutic targets for SGC.

Main Methods:

  • Comparative analysis of miRNA expression profiles in SGC subtypes.
  • Identification of miRNA gene targets using bioinformatics and experimental validation.
  • Correlation of miRNA and target gene expression with SGC subtype and aggressiveness.

Main Results:

  • Shared miRNAs (hsa-miR-34a-5p, hsa-miR-16-5p) target BCL2 and MYC, with differential expression in subtypes.
  • Nodular SGC shows specific overexpression of hsa-miR-150p, downregulating tumor suppressor ZEB1.
  • Pagetoid SGC exhibits overexpression of hsa-miR-205 and hsa-miR-199a, targeting EZH2 and CD44 respectively.

Conclusions:

  • Aberrant miRNA expression patterns are characteristic of distinct SGC subtypes.
  • CD44, overexpressed in pagetoid SGC, represents a promising novel therapeutic target.
  • These findings provide a foundation for improved molecular understanding and targeted treatment strategies for SGC.