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Topical peptides function as signaling molecules that communicate with fibroblasts and keratinocytes, stimulating: Collagen synthesis (types I, III, and IV) Elastin production Barrier repair and hydration retention Melanogenesis regulation (relevant to hyperpigmentation research) Key peptide classes studied in dermatology include: Peptide Class Example Primary Function Signal Peptides Palmitoyl Pentapeptide-4 (Matrixyl) Stimulates collagen and elastin production
Mechanistically, TSA treatment increases the transcription levels of transcription factor EB (TFEB) and its downstream autophagy-lysosome pathway-related genes, including cystinosin and hermansky-pudlak syndrome 1
10.1023/a:1022579416322 Ecotoxicology 73 GarciaS
For example, most men taking exogenous androgens (like testosterone injections) have profound decreases in sperm production, but a relatively small percentage ( 6 months) use can lead to decreases in sperm counts and quality in some men
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