The creatine-phosphocreatine shuttle has important functions in the temporal and spatial maintenance of the energy supply to skeletal and cardiac muscle. Muscle cells do not synthesize creatine, but take it up via a special sodium-dependent transporter, the creatine transporter (SLC6A8). In mouse skin, they found high amounts of cytosolic brain CK (CKB) coexpressed with lower amounts of ubiquitous mitochondrial CK (CKMT1B), both mainly localized in suprabasal layers of the dermis, different cell types of hair follicles, sebaceous glands, and the subcutaneous panniculus carnosus muscle. Except for sebaceous glands, these cells also expressed CRT. Ckb and Crt were upregulated about 3-fold immediately after wounding of mouse skin, whereas the amount of Ckmt1b increased 10 to 15 days after wounding.
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