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| Forni,Maria F; Trombetta-Lima,Marina; Sogayar,Mari C. |
| The skin is a complex stratified organ which acts not only as a permeability barrier and defense against external agents, but also has essential thermoregulatory, sensory and metabolic functions. Due to its high versatility and activity, the skin undergoes continuous self-renewal to repair damaged tissue and replace old cells. Consequently, the skin is a reservoir for adult stem cells of different embryonic origins. Skin stem cell populations reside in the adult hair follicle, sebaceous gland, dermis and epidermis. However, the origin of most of the stem cell populations found in the adult epidermis is still unknown. Far more unknown is the embryonic origin of other stem cells that populate the other layers of this tissue. In this review we attempt to... |
| Tipo: Journal article |
Palavras-chave: Skin development; Embryonic skin; Epidermis; Dermis; Sebaceous Gland; Hair follicle. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000300003 |
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| Moreno-Gómez,Freddy; Duque,Tania; Fierro,Leonardo; Arango,Juan; Peckham,Xiomara; Asencio-Santofimio,Helberg. |
| The mechanisms to obtain and store skin toxins in frogs in of the family Dendrobatidae are not completely understood. In order to contribute to understand how toxins are stored, we provide a histological description of the cutaneous glands of the species Phyllobates bicolor. The skin of two adult frogs was examined through three histological staining techniques (hematoxilin-eosin, PAS and Masson Trichrome) using conventional optic microscopy. The skin of Phyllobates bicolor contains two types of exocrine glands: mucous and serous, which empty their products to the epidermal surface through an intra-epithelial duct that leads to a stoma. The mucous and serous glands and the intercalated ducts are surrounded by a discontinuous sheath of myoepithelial cells,... |
| Tipo: Journal article |
Palavras-chave: Amphibians; Phyllobates bicolor; Integument; Epidermis; Dermis; Mucous glands; Serous glands; Chemical defenses; Bioaccumulation. |
| Ano: 2014 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300022 |
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| Meruane,Manuel; Rojas,Mariana. |
| La Piel y sus estructuras asociadas permiten a los seres vivos subsistir en los diferentes ambientes ecológicos. El desarrollo de la piel y sus anexos en diferentes especies repite patrones comunes. De suma importancia es la interacción epitelio-mesénquima como regulador inicial de este desarrollo. El evento crucial en la formación de anexos, es la aparición de una placoda ectodérmica, a la cual se le asocia una condensación de células dérmicas, expresándose proteínas como Sonic Hedgehog (SHH) y la proteína morfogenética del hueso (BMP) para luego dar forma al anexo de cada especie. En esta revisión describiremos las etapas sucesivas que transcurren en la formación de la dermis, epidermis y anexos, con énfasis en las proteínas que dirigen el proceso. |
| Tipo: Journal article |
Palavras-chave: Piel; Dermis; Epidermis; Anexos. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400025 |
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