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The family of sodium channels has 9 known members, with amino acid identity >50% in the trans-membrane segments and extracellular loop regions. A standardized nomenclature for sodium channels is currently used and is maintained by the IUPHAR. [11] The proteins of these channels are named Na v 1.1 through Na v 1.9.
The epithelial sodium channel (ENaC), (also known as amiloride-sensitive sodium channel) is a membrane-bound ion channel that is selectively permeable to sodium ions (Na +).It is assembled as a heterotrimer composed of three homologous subunits α or δ, β, and γ, [2] These subunits are encoded by four genes: SCNN1A, SCNN1B, SCNN1G, and SCNN1D.
The persistent sodium current (INaP) (also called the "late sodium current" or "non/slow-inactivating sodium current") is a form of sub-threshold, biological electric current contributed by non-inactivating voltage-gated sodium channels (NaVs) found in several central neurons. [1]
SCNN1A, SCNN1B, and SCNN1G are commonly expressed in tight epithelia that have low water permeability. The major organs where ENaC is expressed include parts of the kidney tubular epithelia, [5] [7] [17] the respiratory airway, [18] the female reproductive tract, [18] male reproductive tract, including testis, spermatogonia in the seminiferous tubules, Sertoli cells, and spermatozoa, [19 ...
The family of sodium channels has 9 known members, with amino acid identity >50% in the trans-membrane segments and extracellular loop regions. A standardized nomenclature for sodium channels is currently used and is maintained by the IUPHAR. [8] The proteins of these channels are named Na v 1.1 through Na v 1.9.
The flow of sodium ions across epithelia affects osmolarity of the extracellular fluid. Thus, ENaC plays a central role in the regulation of body fluid and electrolyte homeostasis and consequently affects blood pressure. [7] As ENaC is strongly inhibited by amiloride, it is also referred to as an "amiloride-sensitive sodium channel".
The flow of sodium ions across epithelia affects osmolarity of the extracellular fluid. Thus, ENaC plays a central role in the regulation of body fluid and electrolyte homeostasis and consequently affects blood pressure. [5] As ENaC is strongly inhibited by amiloride, it is also referred to as an "amiloride-sensitive sodium channel".
Tens to thousands of gap junction channels cluster in areas to enable connexon pairs to form. [37] The macromolecular complex is called a gap junction plaque. Molecules other than connexins are involved in gap junction plaques including tight junction protein 1 and sodium channels. [5] [6]