Knowledge (XXG)

Proximal tubule

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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.
133:. 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 604:
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.
415:. 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. 471:. Paracellular transport increases transport efficiency, as determined by oxygen consumed per unit of Na reabsorbed, thus playing a part in maintaining renal oxygen homeostasis. 431:
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
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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
214: 468: 1912: 908: 533:, in that the osmotic potential of the fluid leaving the proximal tubule is the same as that of the initial glomerular filtrate. 192: 1277:
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.
1599: 1994: 806: 740: 443: 60: 453:– 60–70% of the filtered sodium load is reabsorbed in the proximal tubule through active transport, 2157: 2102: 1859: 1854: 1790: 1775: 1615: 1412: 709: 678: 617: 126: 1586:- Comparative Organology at University of California, Davis – "Mammal, kidney cortex (LM, Medium)" 2142: 1825: 1563: 1512: 1500: 1351: 1259: 1216: 1010: 810: 794: 767: 1443: 1436: 719:
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
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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
1869: 838: 798: 728: 670: 408:(Latin "straight part") is the following straight (descending) portion. 102: 2089: 1837: 1744: 1045: 841:; undergoing epithelial mesenchymal trans-differentiation; necrosis or 814: 779: 637: 555: 542: 273: 199: in this section. Unsourced material may be challenged and removed. 118: 2022: 1670: 1294: 912: 517: 122: 231:
cells of this segment of the nephron is covered with densely packed
39: 696: 360: 72: 1604:– "The Nephron: Proximal Tubule, Pars Convoluta & Pars Recta" 829:). There are several ways in which PTECs may respond: producing 713: 629: 596: 1634: 645:
Acidosis increases absorption. Alkalosis decreases absorption.
168: 382:(Latin "convoluted part") is the initial convoluted portion. 723:
are commonly used as models of the proximal tubule: porcine
1473:. Archives of Toxicology. Vol. 18. pp. 173–83. 464:. Active transport is mainly through the sodium/hydrogen 247:
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
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Baltimore: Williams & Wilkins. p.  1392: 1390: 1175:Journal of the American Society of Nephrology 568:co-transporters driven by the sodium gradient 508:) and between cells through tight junctions ( 8: 1429: 1427: 1425: 1438:Renal pathophysiology : the essentials 235:forming a border readily visible under the 1842: 1675: 1653: 1639: 1631: 1540:International Journal of Clinical Oncology 1106: 1104: 1102: 1100: 1098: 78:tubulus proximalis, pars tubuli proximalis 38: 1302: 1202: 1053: 411:Straight segments descend into the outer 303:, it can be divided into three segments, 287:, which have quite different properties. 215:Learn how and when to remove this message 1373:(5th ed.). New York, NY: Springer. 473: 308: 125:which begins from the renal pole of the 2187: 1164: 1162: 1160: 977: 874: 1520: 1510: 1143:. Wolters Kluwer Health. p. 702. 1028:Kumaran GK, Hanukoglu I (March 2020). 959:This article incorporates text in the 747:, arises from the convoluted tubules. 100: 29: 1340:10.1152/physiologyonline.1998.13.1.38 1283:The Journal of Clinical Investigation 660:are secreted in the proximal tubule. 7: 1397:Boron WF, Boulpaep EL, eds. (2005). 1134: 1132: 1111:Boron WF, Boulpaep EL, eds. (2005). 258:of the cells is densely packed with 197:adding citations to reliable sources 1470:Methods for studying renal toxicity 1169:Boron, Walter F. (September 2006). 1115:. Elsevier/Saunders. p. 743. 999:10.1097/01.mnh.0000242180.46362.c4 25: 1413:Hypocitraturia~overview#aw2aab6b5 2190: 1236:Cell Biochemistry and Biophysics 953: 936: 924: 901: 889: 877: 766:) and sepsis (e.g., mediated by 173: 770:from gram-negative bacteria). 184:needs additional citations for 2005:Extraglomerular mesangial cell 1885:Intraglomerular mesangial cell 1596:Essentials of Human Physiology 1371:Principles of renal physiology 1: 27:Segment of nephron in kidneys 1865:Glomerular basement membrane 702:Immunohistochemical staining 664:Drugs secreted in the kidney 370:Proximal convoluted tubule ( 1434:Rose BD, Rennke HG (1994). 967:of the 20th edition of 529:. The solutes are absorbed 227:The luminal surface of the 2234: 1903:Proximal convoluted tubule 1592:"Section 7/7ch03/7ch03p14" 1141:Histology A TEXT AND ATLAS 1139:Wojciech, Pawlina (2016). 743:, the most common form of 396:Proximal straight tubule ( 135:proximal convoluted tubule 2098:Internal urethral orifice 2075:Median umbilical ligament 1982:Juxtaglomerular apparatus 1552:10.1007/s10147-005-0551-4 1479:10.1007/978-3-642-61105-6 446:of the epithelial cells. 346: 342: 339: 328: 325: 95: 37: 1930:Distal convoluted tubule 620:reduces reabsorption of 522:approximately two-thirds 497:approximately two-thirds 483:% of filtrate reabsorbed 318:Ultrastructure divisions 143:proximal straight tubule 1806:Peritubular capillaries 821:), or cytokines (e.g., 805:, vascular injury, and 506:transcellular transport 436:peritubular capillaries 335:Higher cell complexity 2031:Ureteropelvic junction 1935:Collecting duct system 1718:medullary interstitium 1248:10.1385/CBB:36:2-3:147 1187:10.1681/ASN.2006060620 827:tumor necrosis factors 803:interstitial nephritis 772:Renal tubular acidosis 756:Acute tubular necrosis 716: 591:and simple diffusion. 366: 355:Lower cell complexity 264:acidophilic appearance 117:is the segment of the 97:Anatomical terminology 1995:Juxtaglomerular cells 700: 693:Clinical significance 364: 1625:turinary/urinhaute02 807:diabetic nephropathy 741:renal cell carcinoma 727:cells and marsupial 570:out of the nephron. 444:basolateral membrane 193:improve this article 129:to the beginning of 61:Metanephric blastema 2158:Lacunae of Morgagni 2103:Urethral sphincters 1401:(Updated ed.). 762:), pigments (e.g., 679:alpha-ketoglutarate 618:Parathyroid hormone 541:solutes (primarily 1399:Medical Physiology 1079:Medical physiology 1046:10.1111/febs.15088 811:glomerulonephritis 795:glomerulonephritis 768:lipopolysaccharide 717: 706:convoluted tubules 367: 2178: 2177: 2017: 2016: 2013: 2012: 1940:Connecting tubule 1590:Nosek, Thomas M. 1488:978-3-642-64696-6 1453:978-0-683-07354-6 1150:978-1-4698-8931-3 1122:978-1-4160-2328-9 1088:978-0-323-42796-8 871:Additional images 819:diabetes mellitus 662:Further reading: 649: 648: 614:approximately 80% 601:approximately 50% 580:approximately 65% 359: 358: 241:brush border cell 225: 224: 217: 165:Brush border cell 111: 110: 106: 16:(Redirected from 2225: 2195: 2194: 2186: 2052:Vesical arteries 1875:Filtration slits 1860:Bowman's capsule 1843: 1676: 1655: 1648: 1641: 1632: 1608:Swiss embryology 1603: 1598:. Archived from 1572: 1571: 1535: 1529: 1528: 1522: 1518: 1516: 1508: 1464: 1458: 1457: 1441: 1431: 1420: 1409: 1403: 1402: 1394: 1385: 1384: 1366: 1360: 1359: 1323: 1317: 1316: 1306: 1295:10.1172/JCI83942 1274: 1268: 1267: 1231: 1225: 1224: 1206: 1181:(9): 2368–2382. 1166: 1155: 1154: 1136: 1127: 1126: 1108: 1093: 1092: 1074: 1068: 1067: 1057: 1040:(6): 1176–1194. 1025: 1019: 1018: 982: 957: 956: 940: 928: 905: 893: 881: 474: 462:electrodiffusion 326:Proximal tubule 309: 237:light microscope 220: 213: 209: 206: 200: 177: 169: 127:Bowman's capsule 103:edit on Wikidata 42: 30: 21: 18:Proximal tubular 2233: 2232: 2228: 2227: 2226: 2224: 2223: 2222: 2203: 2202: 2201: 2189: 2181: 2179: 2174: 2153:navicular fossa 2084: 2070:Detrusor muscle 2035: 2009: 1976: 1923:Thick ascending 1889: 1847:Renal corpuscle 1832: 1749: 1735:Cortical lobule 1665: 1661:Anatomy of the 1659: 1589: 1580: 1575: 1537: 1536: 1532: 1519: 1509: 1489: 1466: 1465: 1461: 1454: 1433: 1432: 1423: 1410: 1406: 1396: 1395: 1388: 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861: 858: 856: 853: 852: 848: 846: 844: 840: 836: 832: 828: 824: 820: 816: 812: 808: 804: 800: 796: 791: 789: 785: 781: 777: 773: 769: 765: 761: 757: 750: 748: 746: 745:kidney cancer 742: 734: 732: 730: 726: 722: 715: 711: 707: 703: 699: 692: 690: 688: 684: 680: 676: 672: 667: 666: 665: 659: 651: 644: 642:70%–90% 641: 639: 636: 635: 631: 627: 623: 619: 616: 613: 611: 608: 607: 603: 600: 598: 595: 594: 590: 587:mechanisms – 586: 582: 579: 577: 574: 573: 569: 565: 561: 557: 554: 551: 548: 544: 540: 537: 536: 532: 528: 524: 521: 519: 516: 515: 511: 507: 503: 499: 496: 493: 492: 489: 486: 484: 481: 479: 476: 475: 472: 470: 467: 463: 460: 456: 452: 451:P-type ATPase 447: 445: 441: 437: 432: 426: 421: 419: 416: 414: 409: 407: 399: 395: 393: 390: 388: 383: 381: 373: 369: 363: 354: 351: 350: 345: 338: 334: 331: 324: 320: 317: 314: 311: 310: 307: 306: 302: 297: 290: 288: 286: 281: 279: 275: 271: 267: 265: 261: 257: 252: 250: 246: 242: 238: 234: 230: 219: 216: 208: 205:February 2021 198: 194: 188: 187: 182:This section 180: 176: 171: 170: 164: 162: 160: 152: 150: 148: 144: 140: 136: 132: 131:loop of Henle 128: 124: 120: 116: 104: 98: 94: 91: 88: 86: 82: 79: 76: 74: 70: 65: 62: 59: 57: 53: 48: 41: 36: 31: 19: 2143:intermediate 2048:Circulation 1990:Macula densa 1972:Renal pelvis 1895:Renal tubule 1786:interlobular 1766:Renal artery 1623: 1600:the original 1595: 1543: 1539: 1533: 1469: 1462: 1437: 1411: 1407: 1398: 1370: 1364: 1334:(1): 38–43. 1331: 1327: 1321: 1286: 1282: 1272: 1239: 1235: 1229: 1178: 1174: 1140: 1112: 1078: 1072: 1037: 1033: 1023: 993:(5): 530–6. 990: 986: 980: 972: 958: 952: 860:Brush border 855:Urinary pole 823:interferon-Îł 792: 754: 738: 718: 705: 669:Most of the 668: 661: 655: 589:solvent drag 585:paracellular 562:, inorganic 531:isotonically 510:paracellular 487: 482: 477: 459:paracellular 455:solvent drag 448: 433: 430: 417: 410: 405: 403: 397: 391: 387:renal cortex 384: 379: 377: 371: 321:Description 304: 298: 294: 282: 272: 268: 260:mitochondria 253: 249:reabsorptive 226: 211: 202: 191:Please help 186:verification 183: 159:brush border 156: 146: 142: 138: 134: 114: 112: 77: 1967:Major calyx 1962:Minor calyx 1755:Circulation 1546:(1): 22–7. 896:Glomerulus. 784:amino acids 776:bicarbonate 687:bicarbonate 658:medications 560:amino acids 547:amino acids 527:Na/K-ATPase 440:Na/K-ATPase 329:convoluted 278:capillaries 239:giving the 67:Identifiers 2207:Categories 1913:Descending 1855:Glomerulus 1821:interlobar 1811:Vasa recta 1801:Renal vein 1776:interlobar 1328:Physiology 949:References 835:chemokines 760:gentamicin 721:cell lines 502:aquaporins 466:antiporter 427:Absorption 406:pars recta 398:pars recta 233:microvilli 229:epithelial 141:) and the 2138:prostatic 2107:External 2000:Mesangium 1880:Mesangium 1771:segmental 1762:Arteries 1523:ignored ( 1513:cite book 1418:eMedicine 1195:1046-6673 965:page 1223 843:apoptosis 831:cytokines 788:phosphate 764:myoglobin 710:glomeruli 683:glutamate 675:glutamine 652:Secretion 626:intestine 622:phosphate 610:phosphate 576:potassium 564:phosphate 478:Substance 422:Functions 347:straight 299:Based on 291:Divisions 256:cytoplasm 153:Structure 56:Precursor 2123:Internal 2064:(female) 1870:Podocyte 1826:efferent 1791:afferent 1713:pyramids 1568:28183020 1560:16508725 1505:27034550 1356:29602556 1348:11390757 1313:27214555 1264:24141102 1256:12139400 1213:21170887 1064:31605441 1015:42761720 1007:16914967 849:See also 839:collagen 799:ischemia 729:OK cells 671:ammonium 488:Comments 2197:Anatomy 2090:Urethra 2080:Trigone 2041:Bladder 2023:Ureters 1838:Nephron 1816:arcuate 1781:arcuate 1745:Nephron 1708:Medulla 1691:Capsule 1671:Kidneys 1497:8678793 1304:4922683 1221:3122791 1204:4699187 1055:7384063 815:glucose 780:glucose 725:LLC-PK1 704:of the 638:citrate 556:Glucose 543:glucose 539:organic 442:in the 413:medulla 312:Segment 245:luminal 123:kidneys 119:nephron 90:D007687 50:Details 2183:Portal 2148:spongy 2116:female 1797:Veins 1701:column 1696:Cortex 1686:Fascia 1679:Layers 1618:, and 1610:(from 1566:  1558:  1503:  1495:  1485:  1450:  1377:  1354:  1346:  1311:  1301:  1262:  1254:  1219:  1211:  1201:  1193:  1147:  1119:  1085:  1062:  1052:  1034:FEBS J 1013:  1005:  973:(1918) 913:kidney 837:, and 786:, and 735:Cancer 518:sodium 457:, and 274:Agonal 1725:Sinus 1564:S2CID 1501:S2CID 1352:S2CID 1260:S2CID 1217:S2CID 1011:S2CID 963:from 751:Other 739:Most 712:with 630:bones 494:water 101:[ 73:Latin 2111:male 1730:Lobe 1556:PMID 1525:help 1493:PMID 1483:ISBN 1448:ISBN 1375:ISBN 1344:PMID 1309:PMID 1252:PMID 1209:PMID 1191:ISSN 1145:ISBN 1117:ISBN 1083:ISBN 1060:PMID 1003:PMID 825:and 817:(in 714:CD10 708:and 628:and 597:urea 552:100% 545:and 469:NHE3 404:The 378:The 254:The 113:The 85:MeSH 1548:doi 1475:doi 1444:132 1416:at 1336:doi 1299:PMC 1291:doi 1287:126 1244:doi 1199:PMC 1183:doi 1050:PMC 1042:doi 1038:287 995:doi 909:TEM 813:), 677:to 512:). 340:S2 332:S1 195:by 149:). 147:PST 139:PCT 121:in 2209:: 1622:) 1620:UF 1616:UB 1614:, 1612:UL 1594:. 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Index

Proximal tubular

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

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