Biomaterial Database

Glomerular tubular balance: mediation by luminal hypotonicity. 1989

D A Häberle, and U Müller, and W Nagel

Physiologisches Institut, Universität München, BRD.

Late proximal rat tubular segments were microperfused with slightly hypo- or hypertonic artificial late proximal tubular fluid (ATF) at low (11-13 nl/min) or high (30-38 nl/min) perfusion rates. Volume reabsorption, net chloride and solute reabsorption were measured as a function of length. In addition, the transepithelial resistance and voltage (Vte) were measured as a function of the applied osmotic gradient. Hypertonic solutions equilibrated to isotonicity by solute outflow rather than water influx. With hypertonic ATF the lumen positive Vte was decreased compared with free flow or with hypotonic ATF. The resistance was not significantly different between the different groups. In contrast to hypotonic ATF, hypertonic or isotonic ATF was not significantly reabsorbed. In addition, hypotonic ATF maintained its hypotonicity along the perfused segments. Its reabsorption was flow-dependent. Hypotonicity appeared to enhance solute reabsorption.

UI	MeSH Term	Description	Entries
D006982	Hypertonic Solutions	Solutions that have a greater osmotic pressure than a reference solution such as blood, plasma, or interstitial fluid.	Hypertonic Solution,Solution, Hypertonic,Solutions, Hypertonic
D007038	Hypotonic Solutions	Solutions that have a lesser osmotic pressure than a reference solution such as blood, plasma, or interstitial fluid.	Solutions, Hypotonic
D007678	Kidney Glomerulus	A cluster of convoluted capillaries beginning at each nephric tubule in the kidney and held together by connective tissue.	Glomerulus, Kidney
D007687	Kidney Tubules, Proximal	The renal tubule portion that extends from the BOWMAN CAPSULE in the KIDNEY CORTEX into the KIDNEY MEDULLA. The proximal tubule consists of a convoluted proximal segment in the cortex, and a distal straight segment descending into the medulla where it forms the U-shaped LOOP OF HENLE.	Proximal Kidney Tubule,Proximal Renal Tubule,Kidney Tubule, Proximal,Proximal Kidney Tubules,Proximal Renal Tubules,Renal Tubule, Proximal,Renal Tubules, Proximal,Tubule, Proximal Kidney,Tubule, Proximal Renal,Tubules, Proximal Kidney,Tubules, Proximal Renal
D008297	Male		Males
D008564	Membrane Potentials	The voltage differences across a membrane. For cellular membranes they are computed by subtracting the voltage measured outside the membrane from the voltage measured inside the membrane. They result from differences of inside versus outside concentration of potassium, sodium, chloride, and other ions across cells' or ORGANELLES membranes. For excitable cells, the resting membrane potentials range between -30 and -100 millivolts. Physical, chemical, or electrical stimuli can make a membrane potential more negative (hyperpolarization), or less negative (depolarization).	Resting Potentials,Transmembrane Potentials,Delta Psi,Resting Membrane Potential,Transmembrane Electrical Potential Difference,Transmembrane Potential Difference,Difference, Transmembrane Potential,Differences, Transmembrane Potential,Membrane Potential,Membrane Potential, Resting,Membrane Potentials, Resting,Potential Difference, Transmembrane,Potential Differences, Transmembrane,Potential, Membrane,Potential, Resting,Potential, Transmembrane,Potentials, Membrane,Potentials, Resting,Potentials, Transmembrane,Resting Membrane Potentials,Resting Potential,Transmembrane Potential,Transmembrane Potential Differences
D010477	Perfusion	Treatment process involving the injection of fluid into an organ or tissue.	Perfusions
D011919	Rats, Inbred Strains	Genetically identical individuals developed from brother and sister matings which have been carried out for twenty or more generations or by parent x offspring matings carried out with certain restrictions. This also includes animals with a long history of closed colony breeding.	August Rats,Inbred Rat Strains,Inbred Strain of Rat,Inbred Strain of Rats,Inbred Strains of Rats,Rat, Inbred Strain,August Rat,Inbred Rat Strain,Inbred Strain Rat,Inbred Strain Rats,Inbred Strains Rat,Inbred Strains Rats,Rat Inbred Strain,Rat Inbred Strains,Rat Strain, Inbred,Rat Strains, Inbred,Rat, August,Rat, Inbred Strains,Rats Inbred Strain,Rats Inbred Strains,Rats, August,Rats, Inbred Strain,Strain Rat, Inbred,Strain Rats, Inbred,Strain, Inbred Rat,Strains, Inbred Rat
D000042	Absorption	The physical or physiological processes by which substances, tissue, cells, etc. take up or take in other substances or energy.
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia