Amino acid transport system in skeletal muscle (None)

Amino acid supply to skeletal muscle tissue involves specialized membrane-bound proteins that mediate the uptake of extracellular free amino acids into myocytes. Key players include several families of solute carrier (SLC) transporters such as LAT1, which primarily imports leucine while exchanging glutamine outwards; SNAT2, which co-transports sodium ions with glutamine inward; and PAT1 located on lysosomal membranes involved in sensing intracellular lysosomal levels for mTORC1 activation. Leucine acts as an essential regulator stimulating protein synthesis through activation of mechanistic target of rapamycin complex 1 (mTORC1), promoting hypertrophy. The balance between anabolic processes like protein translation and catabolic pathways involving enzymes such as BCAT and BCKDH determines whether incoming BCAAs are used for energy production or building new proteins. Regulatory factors like activating transcription factor ATF4 modulate expression levels of these key transporter proteins under various physiological conditions including exercise or nutritional states. Dysfunctional regulation can contribute to pathological states characterized by impaired muscle mass maintenance. In summary, "amino acid supply to muscle tissue" represents an integrated network comprising multiple molecular entities—primarily membrane-bound solute carriers transporting specific subsets of essential nutrients critical for maintaining skeletal muscle function, growth, repair, and metabolic homeostasis[1][2][4][5].

Other names

Amino acid uptake in muscleMuscle amino acid transportSkeletal muscle amino acid supply

Drugs targeting these systems may: - Modulate transporter activity affecting intracellular availability of essential amino acids like leucine. - Influence mTORC1 signaling pathways that regulate protein synthesis.