Transcript Slide 1
Dwi Winarni Departemen Biologi Fakultas Sains dan Teknologi Universitas Airlangga 2009 ACTH=adrenocorticotropic hormone, LPH=Lipotropin, AL=anterior lobe, IL=intermediate lobe, CLIP=corticotropin-like intermediate lobe peptide. a,b, dan g MSH bersama-sama disebut sebagai melanotropin atau intermedin MSH adalah hormon yang dihasilkan hipofisis lobus intermediat MSH meningkatkan sintesis melanin (pada melanosit) dan pada melanophore (melanofora) juga mengakibatkan dispersi melanosoma Melanin dapat ditemukan terutama di kulit, rambut, mata, sisik, bulu dan kutikula hewan Melanosoma adalah organel yang mensintesis dan menyimpan melanin dan pada melanosit di epidermis mamalia, berperan juga sebagai organel yang dapat “mensekresikan” melanin contains brown red pigment contains brown black pigment =sel penghasil pigmen coklat hitam (melanin) Schematic outline of the metabolic pathway leading to melanin formation in mammals Biochemical Journal (1997) Volume 323, 749-756 UV increases melanogenesis .The four stages of melanosome development of MNT-1 human melanoma cells are shown in the upper panels. Note the dense bilayered coat (arrowhead) and intralumenal vesicles (arrow) of stage I melanosomes, the proteinaceous fibrils (arrow) of stage II, and the melanin deposition (black) in stages III and IV. The main panel shows a typical field of MNT-1 cytoplasm near the nucleus, which contains all four stages of melanosomes. M, mitochondria; N, nucleus. Scale bar represents 0.5 m m. Schematic diagram of the late secretory and endosomal systems, emphasizing the best characterized compartments found in a | all cell types or b | melanocytes. Secretory granules, present in only certain cell types, are also indicated in a. Arrows represent proposed directions of protein and lipid transport between organelles. 'Spikes' indicate clathrin coats; the dense clathrin-containing coat of the coated endosome in melanocytes is also indicated by black shading, as this probably contains additional components. Intralumenal vesicles are present in late endosomes and coated endosomes, as indicated by small circles; irregularly shaped intralumenal membranes tend to be present in lysosomes. The intralumenal striations of stage II and III melanosomes are indicated. In b, potential sites of action of certain proteins are also indicated. CHS, Chediaki Higashi syndrome; HPS, Hermansky– Pudlak syndrome; TGN, trans-Golgi network; AP-1/AP-3, adaptor complexes HPS, Hermansky–Pudlak syndrome; Melanocytes are cells located in the bottom layer (the stratum basale) of the skin's epidermis, and in the middle layer of the eye (the uvea). In the skin, melanin are transferred to keratinocytes MELANOFORA (MELANOPHORE) MSH aggregated dispersed Pada berbagai invertebrata dan cold-blooded vertebrates melanofora pada sisik Teleostei pigments aggregated pigments dispersed A mutant zebrafish larva that fails to synthezise melanin in its melanophores, beneath a non-mutant, wildtype larva melanofora umumnya berada bersama-sama dengan kromatofora lain a.l. 1. Xanthophore mengandung pigmen kuning 2. Erythrophore mengandung pigmen merah 3. Leucophore pigmen putih 4. Cyanophore biru 3. Iridophore/ guanophore mengandung reflecting plateles yang merupakan kristal guanin Urutan lapisan kromatofora pada kulit katak hijau dark A single zebrafish melanophore imaged by time-lapse photography during pigment aggregation light Dendrobates pumilio, a poison dart frog. Some brightly colored species have unusual chromatophores of unknown pigment composition Chromatophores contain yellow and red pigments . Reflected incident light becomes the blue, yellow, green (blue plus yellow). A layer of dark melanin influences the 'lightness' of the reflected light. All these pigment cells can rapidly relocate their pigments, thereby influencing the colour of the chameleon. Sekresi MSH dipengaruhi oleh:Cahaya lewat fotoreseptor terang-agregasi Selain oleh MSH, melanofora dipengaruhi oleh a.l. 1. Katekolamin stimulasi reseptor a-adrenergik karena faktor stress akut mengakibatkan “excitement pallor” karena terjadi agregasi 2. Kadar cAMP intrasel Lobus intermediat pada mamalia mengalami degenerasi MSH ??? Pigmentasi ??? Series concept: Simple & perfect whitening by marine complex Our skin is always damaged by UV, smoke, stress and this damage increases the abnormal melanogenesis and irregular turnover. The result is pigmentation and skin aging are accelerated and the skin loses its transparency and gets freckles. 2 marine complexes work to keep your skin healthy and to make your skin brighter: - Ocean White Complex (OWC): several natural seaweed complex work to eliminate melanin and restrain melanogenesis. - Ocean Stress-free Complex (OSC): ocean Magnesium, pearl extract and natural seaweed complex reinforce barrier function of skin and make the skin which can resist external / internal stress