Knowledge (XXG)

Proximal tubule

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927: 892: 351: 2181: 880: 915: 868: 164: 687: 944: 29: 255:. The mitochondria are needed in order to supply the energy for the active transport of sodium ions out of the cells to create a concentration gradient which allows more sodium ions to enter the cell from the luminal side. Water passively follows the sodium out of the cell along its concentration gradient. 2201: 284:
Based on its appearance at low magnification, the proximal tubule can be divided into two sections: the proximal convoluted tubule (PCT), and the proximal straight tubule (PST). Differences in cell outlines exist between these segments, and therefore presumably in function too.
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Cuboidal epithelial cells lining the proximal tubule have extensive lateral interdigitations between neighboring cells, which lend an appearance of having no discrete cell margins when viewed with a light microscope.
122:. At this location, the glomerular parietal epithelial cells (PECs) lining bowman’s capsule abruptly transition to proximal tubule epithelial cells (PTECs). The proximal tubule can be further classified into the 593:
Paracellular fluid reabsorption sweeps some urea with it via solvent drag. As water leaves the lumen, the concentration of urea increases, which facilitates diffusion in the late proximal tubule.
404:. They terminate at a remarkably uniform level and it is their line of termination that establishes the boundary between the inner and outer stripes of the outer zone of the renal medulla. 460:. Paracellular transport increases transport efficiency, as determined by oxygen consumed per unit of Na reabsorbed, thus playing a part in maintaining renal oxygen homeostasis. 420:
The proximal tubule efficiently regulates the pH of the filtrate by secreting hydrogen ions (acid) into the tubule and reabsorbing approximately 80% of the filtered bicarbonate.
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Mass movement of sodium occurs through the cells, by secondary active transport on the apical membrane, followed by active resorption across the basolateral membrane via the
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surrounding the tubule often leads to disturbance of the cellular morphology of the proximal tubule cells, including the ejection of cell nuclei into the tubule lumen.
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function as well as putative flow sensing within the lumen. The microvilli are composed of actin filament bundles that have been visualized using confocal microscopy.
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GarcĂ­a, NĂ©stor H.; Ramsey, Carla R.; Knox, Franklyn G. (February 1998). "Understanding the Role of Paracellular Transport in the Proximal Tubule".
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and the conversion of glutamate to alpha-ketoglutarate. The alpha-ketoglutarate generated in this process is then further broken down to form two
763:(proximal type) (Fanconi syndrome) occurs when the PTECs are unable to properly reabsorb glomerular filtrate so that there is increased loss of 272:
This has led some observers to describe the lumen of proximal tubules as occluded or "dirty-looking", in contrast to the "clean" appearance of
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Some investigators on the basis of particular functional differences have divided the convoluted part into two segments designated S1 and S2.
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into the blood, the responses to PTH cancel each other out, and the serum concentration of phosphate remains approximately the same.
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In relation to the morphology of the kidney as a whole, the convoluted segments of the proximal tubules are confined entirely to the
203: 457: 1901: 897: 522:, in that the osmotic potential of the fluid leaving the proximal tubule is the same as that of the initial glomerular filtrate. 181: 1266:
Pei L, Solis G, Nguyen MT, Kamat N, Magenheimer L, Zhuo M, Li J, Curry J, McDonough AA, Fields TA, Welch WJ, Yu AS (July 2016).
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anions, which are pumped out of the basolateral portion of the tubule cell by co-transport with sodium ions.
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As a logical extension of the nomenclature described above, this segment is sometimes designated as S3.
1588: 1983: 795: 729: 432: 49: 442:– 60–70% of the filtered sodium load is reabsorbed in the proximal tubule through active transport, 2146: 2091: 1848: 1843: 1779: 1764: 1604: 1401: 698: 667: 606: 115: 1575:- Comparative Organology at University of California, Davis – "Mammal, kidney cortex (LM, Medium)" 2131: 1814: 1552: 1501: 1489: 1340: 1248: 1205: 999: 799: 783: 756: 1432: 1425: 708:
Proximal tubular epithelial cells (PTECs) have a pivotal role in kidney disease. Two mammalian
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Scheme of renal tubule and its vascular supply. (1st convoluted tubule labeled at center top.)
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Proximal tubule cell showing pumps involved in acid base balance, left is the lumen of tubule
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Aronson PS (2002). "Ion exchangers mediating NaCl transport in the renal proximal tubule".
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Knowledge (XXG) articles incorporating text from the 20th edition of Gray's Anatomy (1918)
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Mass movement of water and occurs both through the cells and between them, passively via
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in the proximal tubules, but, because it also enhances the uptake of phosphate from the
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Fluid in the filtrate entering the proximal convoluted tubule is reabsorbed into the
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resorption of the proximal tubular contents after interruption of circulation in the
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that is excreted in the urine is formed in the proximal tubule via the breakdown of
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Wang T (September 2006). "Flow-activated transport events along the nephron".
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PTECs also participate in the progression of tubulointerstitial injury due to
748: 709: 686: 535: 454: 221: 217: 44: 1183: 555:, and some other solutes are resorbed via secondary active transport through 1988: 1868: 1406: 831: 819: 776: 752: 747:
occurs when PTECs are directly damaged by toxins such as antibiotics (e.g.,
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The most distinctive characteristic of the proximal tubule is its luminal
1858: 827: 787: 717: 659: 397:(Latin "straight part") is the following straight (descending) portion. 91: 2078: 1826: 1733: 1034: 830:; undergoing epithelial mesenchymal trans-differentiation; necrosis or 803: 768: 626: 544: 531: 262: 188: in this section. Unsourced material may be challenged and removed. 107: 2011: 1659: 1283: 901: 506: 111: 220:
cells of this segment of the nephron is covered with densely packed
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Acidosis increases absorption. Alkalosis decreases absorption.
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are commonly used as models of the proximal tubule: porcine
1462:. Archives of Toxicology. Vol. 18. pp. 173–83. 453:. Active transport is mainly through the sodium/hydrogen 236:
surface area of the cells, presumably facilitating their
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of negatively stained proximal convoluted tubule of Rat
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Medical Physiology: A Cellular And Molecular Approaoch
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Tomita Y (February 2006). "Early renal cell cancer".
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Kruidering M, van de Water B, Nagelkerke JF (1996).
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Lote, Christopher J. (2012). "The Proximal Tubule".
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tissue at a magnification of ~55,000x and 80KV with
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List of distinct cell types in the adult human body
72: 60: 55: 43: 38: 21: 1424: 1160:"Acid-Base Transport by the Renal Proximal Tubule" 873:Distribution of blood vessels in cortex of kidney. 572:Most of the filtered potassium is resorbed by two 438:Sodium reabsorption is primarily driven by this 232:its name. The microvilli greatly increase the 976:Current Opinion in Nephrology and Hypertension 932:Diagram outlining movement of ions in nephron. 1635: 1573:Anatomy photo: Urinary/mammal/cortex1/cortex6 1431:. Baltimore: Williams & Wilkins. p.  1381: 1379: 1164:Journal of the American Society of Nephrology 557:co-transporters driven by the sodium gradient 497:) and between cells through tight junctions ( 8: 1418: 1416: 1414: 1427:Renal pathophysiology : the essentials 224:forming a border readily visible under the 1831: 1664: 1642: 1628: 1620: 1529:International Journal of Clinical Oncology 1095: 1093: 1091: 1089: 1087: 67:tubulus proximalis, pars tubuli proximalis 27: 1291: 1191: 1042: 400:Straight segments descend into the outer 292:, it can be divided into three segments, 276:, which have quite different properties. 204:Learn how and when to remove this message 1362:(5th ed.). New York, NY: Springer. 462: 297: 114:which begins from the renal pole of the 2176: 1153: 1151: 1149: 966: 863: 1509: 1499: 1132:. Wolters Kluwer Health. p. 702. 1017:Kumaran GK, Hanukoglu I (March 2020). 948:This article incorporates text in the 736:, arises from the convoluted tubules. 89: 18: 1329:10.1152/physiologyonline.1998.13.1.38 1272:The Journal of Clinical Investigation 649:are secreted in the proximal tubule. 7: 1386:Boron WF, Boulpaep EL, eds. (2005). 1123: 1121: 1100:Boron WF, Boulpaep EL, eds. (2005). 247:of the cells is densely packed with 186:adding citations to reliable sources 1459:Methods for studying renal toxicity 1158:Boron, Walter F. (September 2006). 1104:. Elsevier/Saunders. p. 743. 988:10.1097/01.mnh.0000242180.46362.c4 14: 1402:Hypocitraturia~overview#aw2aab6b5 2179: 1225:Cell Biochemistry and Biophysics 942: 925: 913: 890: 878: 866: 755:) and sepsis (e.g., mediated by 162: 759:from gram-negative bacteria). 173:needs additional citations for 1994:Extraglomerular mesangial cell 1874:Intraglomerular mesangial cell 1585:Essentials of Human Physiology 1360:Principles of renal physiology 1: 16:Segment of nephron in kidneys 1854:Glomerular basement membrane 691:Immunohistochemical staining 653:Drugs secreted in the kidney 359:Proximal convoluted tubule ( 1423:Rose BD, Rennke HG (1994). 956:of the 20th edition of 518:. The solutes are absorbed 216:The luminal surface of the 2223: 1892:Proximal convoluted tubule 1581:"Section 7/7ch03/7ch03p14" 1130:Histology A TEXT AND ATLAS 1128:Wojciech, Pawlina (2016). 732:, the most common form of 385:Proximal straight tubule ( 124:proximal convoluted tubule 2087:Internal urethral orifice 2064:Median umbilical ligament 1971:Juxtaglomerular apparatus 1541:10.1007/s10147-005-0551-4 1468:10.1007/978-3-642-61105-6 435:of the epithelial cells. 335: 331: 328: 317: 314: 84: 26: 1919:Distal convoluted tubule 609:reduces reabsorption of 511:approximately two-thirds 486:approximately two-thirds 472:% of filtrate reabsorbed 307:Ultrastructure divisions 132:proximal straight tubule 1795:Peritubular capillaries 810:), or cytokines (e.g., 794:, vascular injury, and 495:transcellular transport 425:peritubular capillaries 324:Higher cell complexity 2020:Ureteropelvic junction 1924:Collecting duct system 1707:medullary interstitium 1237:10.1385/CBB:36:2-3:147 1176:10.1681/ASN.2006060620 816:tumor necrosis factors 792:interstitial nephritis 761:Renal tubular acidosis 745:Acute tubular necrosis 705: 580:and simple diffusion. 355: 344:Lower cell complexity 253:acidophilic appearance 106:is the segment of the 86:Anatomical terminology 1984:Juxtaglomerular cells 689: 682:Clinical significance 353: 1614:turinary/urinhaute02 796:diabetic nephropathy 730:renal cell carcinoma 716:cells and marsupial 559:out of the nephron. 433:basolateral membrane 182:improve this article 118:to the beginning of 50:Metanephric blastema 2147:Lacunae of Morgagni 2092:Urethral sphincters 1390:(Updated ed.). 751:), pigments (e.g., 668:alpha-ketoglutarate 607:Parathyroid hormone 530:solutes (primarily 1388:Medical Physiology 1068:Medical physiology 1035:10.1111/febs.15088 800:glomerulonephritis 784:glomerulonephritis 757:lipopolysaccharide 706: 695:convoluted tubules 356: 2167: 2166: 2006: 2005: 2002: 2001: 1929:Connecting tubule 1579:Nosek, Thomas M. 1477:978-3-642-64696-6 1442:978-0-683-07354-6 1139:978-1-4698-8931-3 1111:978-1-4160-2328-9 1077:978-0-323-42796-8 860:Additional images 808:diabetes mellitus 651:Further reading: 638: 637: 603:approximately 80% 590:approximately 50% 569:approximately 65% 348: 347: 230:brush border cell 214: 213: 206: 154:Brush border cell 100: 99: 95: 2214: 2184: 2183: 2175: 2041:Vesical arteries 1864:Filtration slits 1849:Bowman's capsule 1832: 1665: 1644: 1637: 1630: 1621: 1597:Swiss embryology 1592: 1587:. 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151: 149: 141: 139: 137: 133: 129: 125: 121: 120:loop of Henle 117: 113: 109: 105: 93: 87: 83: 80: 77: 75: 71: 68: 65: 63: 59: 54: 51: 48: 46: 42: 37: 30: 25: 20: 2132:intermediate 2037:Circulation 1979:Macula densa 1961:Renal pelvis 1884:Renal tubule 1775:interlobular 1755:Renal artery 1612: 1589:the original 1584: 1532: 1528: 1522: 1458: 1451: 1426: 1400: 1396: 1387: 1359: 1353: 1323:(1): 38–43. 1320: 1316: 1310: 1275: 1271: 1261: 1228: 1224: 1218: 1167: 1163: 1129: 1101: 1067: 1061: 1026: 1022: 1012: 982:(5): 530–6. 979: 975: 969: 961: 947: 941: 849:Brush border 844:Urinary pole 812:interferon-Îł 781: 743: 727: 707: 694: 658:Most of the 657: 650: 644: 578:solvent drag 574:paracellular 551:, inorganic 520:isotonically 499:paracellular 476: 471: 466: 448:paracellular 444:solvent drag 437: 422: 419: 406: 399: 394: 392: 386: 380: 376:renal cortex 373: 368: 366: 360: 310:Description 293: 287: 283: 271: 261: 257: 249:mitochondria 242: 238:reabsorptive 215: 200: 191: 180:Please help 175:verification 172: 148:brush border 145: 135: 131: 127: 123: 103: 101: 66: 1956:Major calyx 1951:Minor calyx 1744:Circulation 1535:(1): 22–7. 885:Glomerulus. 773:amino acids 765:bicarbonate 676:bicarbonate 647:medications 549:amino acids 536:amino acids 516:Na/K-ATPase 429:Na/K-ATPase 318:convoluted 267:capillaries 228:giving the 56:Identifiers 2196:Categories 1902:Descending 1844:Glomerulus 1810:interlobar 1800:Vasa recta 1790:Renal vein 1765:interlobar 1317:Physiology 938:References 824:chemokines 749:gentamicin 710:cell lines 491:aquaporins 455:antiporter 416:Absorption 395:pars recta 387:pars recta 222:microvilli 218:epithelial 130:) and the 2127:prostatic 2096:External 1989:Mesangium 1869:Mesangium 1760:segmental 1751:Arteries 1512:ignored ( 1502:cite book 1407:eMedicine 1184:1046-6673 954:page 1223 832:apoptosis 820:cytokines 777:phosphate 753:myoglobin 699:glomeruli 672:glutamate 664:glutamine 641:Secretion 615:intestine 611:phosphate 599:phosphate 565:potassium 553:phosphate 467:Substance 411:Functions 336:straight 288:Based on 280:Divisions 245:cytoplasm 142:Structure 45:Precursor 2112:Internal 2053:(female) 1859:Podocyte 1815:efferent 1780:afferent 1702:pyramids 1557:28183020 1549:16508725 1494:27034550 1345:29602556 1337:11390757 1302:27214555 1253:24141102 1245:12139400 1202:21170887 1053:31605441 1004:42761720 996:16914967 838:See also 828:collagen 788:ischemia 718:OK cells 660:ammonium 477:Comments 2186:Anatomy 2079:Urethra 2069:Trigone 2030:Bladder 2012:Ureters 1827:Nephron 1805:arcuate 1770:arcuate 1734:Nephron 1697:Medulla 1680:Capsule 1660:Kidneys 1486:8678793 1293:4922683 1210:3122791 1193:4699187 1044:7384063 804:glucose 769:glucose 714:LLC-PK1 693:of the 627:citrate 545:Glucose 532:glucose 528:organic 431:in the 402:medulla 301:Segment 234:luminal 112:kidneys 108:nephron 79:D007687 39:Details 2172:Portal 2137:spongy 2105:female 1786:Veins 1690:column 1685:Cortex 1675:Fascia 1668:Layers 1607:, and 1599:(from 1555:  1547:  1492:  1484:  1474:  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Index


Precursor
Metanephric blastema
Latin
MeSH
D007687
Anatomical terminology
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nephron
kidneys
Bowman's capsule
loop of Henle
brush border

verification
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epithelial
microvilli
light microscope
brush border cell
luminal
reabsorptive
cytoplasm
mitochondria
acidophilic appearance
Agonal
capillaries
distal tubules

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