Epithelial Systems
Biology Laboratory, NHLBI, NIH
Isolated Perfused Tubule Technique
The Epithelial Systems
Biology Laboratory investigates mechanisms responsible for regulation of
transport across the epithelia of nephrons and collecting ducts in the kidney. Although the laboratory employs a wide variety
of modern, large-scale data acquisition techniques for these studies,
functional data remain of prime importance. Invented by Maurice Burg in the 1960's (1), the isolated perfused tubule technique
continues to be utilized in the laboratory to provide a functional readout. Tubule
segments, typically consisting of 200-400 cells, can be microdissected
from rat or mouse kidneys and mounted on miniature glass micropipettes to allow
measurement of transepithelial transport rates for
water and solutes (2). The isolated perfused tubule technique has
been particularly useful in studies of various knockout mouse models (3-5). Microdissected
tubules can also be used for a variety of other experimental measurements (6) including, most
recently, identification of complete transcriptomes
for all 14 renal tubule segments using RNA-seq (7). Click here for blueprints for isolated perfused tubule apparatus.
References:
1. Burg M, Grantham J, Abramow
M, Orloff J. Preparation
and study of fragments of single rabbit nephrons. Am J Physiol. 1966; 210: 1293-8. PMID: 5923067.
2. Burg MB, Knepper MA. Single
tubule perfusion techniques. Kidney
Int. 1986; 30: 166-70. PMID: 3761862.
3. Chou CL, Ma T, Yang B, Knepper MA, Verkman AS. Fourfold reduction of water permeability in
inner medullary collecting duct of aquaporin-4 knockout mice. Am J Physiol. 1998; 274: C549-54. PMID: 9486146.
4. Fenton RA, Chou CL,
Stewart GS, Smith CP, Knepper MA. Urinary concentrating defect in mice with
selective deletion of phloretin-sensitive urea
transporters in the renal collecting duct. Proc Natl Acad Sci U S A. 2004; 101: 7469-74. PMID: 15123796.
5. Li JH, Chou CL, Li B, Gavrilova O, Eisner C, Schnermann
J, Anderson SA, Deng CX, Knepper MA, Wess J. A selective
EP4 PGE2 receptor agonist alleviates disease in a new mouse model of X-linked nephrogenic diabetes insipidus. J Clin Invest. 2009; 119: 3115-26. PMID: 19729836.
6. Wright PA, Burg MB, Knepper MA. Microdissection of
kidney tubule segments. Methods Enzymol. 1990; 191: 226-31. PMID: 2074757.
7. Lee JW, Chou CL, Knepper MA. Deep sequencing
in microdissected renal tubules identifies nephron segment-specific
transcriptomes. J Am Soc Nephrol. 2015
Mar 27. [Epub ahead of
print] PMID: 25817355.