acute interstitial nephritis analgesic-induced tubulointerstitial nephritis acetosalicylic acid chronic renal failure computer tomography chronic tubulointerstitial nephritis end-stage renal disease glomerular filtration rate granulomatous interstitial nephropathy human immunodeficiency virus interleukin nonsteroidal anti-inflammatory drugs odds ratio platelet-derived growth factor red blood cells relative risk systemic lupus erythrematosus transforming growth factor-Β tubulointerstitial nephritis white blood cells Tubules and interstitium make up approximately 80% of the renal volume, and occupy the compartment referred to as the tubulointerstitium. The interstitium space takes up 13% of rat and up to 17% of dog and rabbit kidneys, including 7 to 9% of renal cortex, 3 to 5% of outer medulla and 30 to 40% of inner medulla and papillary tip1.Wolgast M.A. Larson M. Nygren K. Functional characteristics of renal interstitium.Am J Physiol. 1981; 241 (Renal Fluid Electrolyte Physiol 10): F105-F111PubMed Google Scholar,2.Lemley K.V. Kriz W. Anatomy of the renal interstitium.Kidney Int. 1991; 39: 370-381Abstract Full Text PDF PubMed Scopus (187) Google Scholar. It is made up of both cellular and matrix components. There are two main cell types. (a) Type I interstitial cells are fibroblast-like cells capable of producing and degrading extracellular matrix. The lipid-rich interstitial cells in the inner medulla, a possible source of prostaglandins, are also considered to be a form of type I interstitial cells. (b) Type II interstitial cells, found in all renal zones, include monocyte derived macrophages with capacity for phagocytosis and dendritic antigen-presenting cells found primarily in the cortex. The matrix is made up of a fibrillar net of interstitial and basement membrane collagens and associated proteoglycans, glycoproteins, and interstitial fluid. The interstitial compartment not only provides structural support for the individual nephrons, but also serves as a conduit for solute transport2.Lemley K.V. Kriz W. Anatomy of the renal interstitium.Kidney Int. 1991; 39: 370-381Abstract Full Text PDF PubMed Scopus (187) Google Scholar. It is also the site of production of several hormones and cytokines such as erythropoietin and prostaglandins. Renal diseases can broadly be classified as glomerular, vascular, tubulointerstitial or obstructive in origin. Diseases of tubulointerstitial compartment may be the result of primary injury to this compartment or secondary to injury to other compartments. Several studies in patients with a variety of renal diseases have shown that changes in the tubulointerstitial compartment are a better predictor of the severity of renal dysfunction and long-term outcome than changes in other compartments3.Striker G.E. Schainuck L.I. Cutler R.E. Benditt E.P. Structural-functional correlations in renal diseases. Part 1: A method for assaying and classifying histophatholgic changes in renal disease.Hum Pathol. 1970; 1: 615-630Abstract Full Text PDF PubMed Scopus (126) Google Scholar, 4.Mujais S. Battle D.C. Functional correlates of tubulo-interstitial damage.Semin Nephrol. 1988; 8: 94-99PubMed Google Scholar, 5.Eknoyan G. Mc Donald M.A. Appel D. Truong L.D. Chronic tubulo-interstitial nephritis: Correlation between structural and functional findings.Kidney Int. 1990; 38: 736-743Abstract Full Text PDF PubMed Scopus (38) Google Scholar, 6.Bohle A. Mackensen-Haen S. Gise H. The consequences of tubulointerstitial changes for renal function in glomerulopathies,.in: Amerio A. Cortelli P. Massry S.E. Tubulo-Interstitial Nephropathies. Kluwer Academic Press, Boston, Dordrecht, London1991: 29-40Crossref Google Scholar, 7.Nath K.A. Tubulointerstitial changes as a major determinant in the progression of renal damage.Am J Kidney Dis. 1992; 20: 1-17Abstract Full Text PDF PubMed Scopus (806) Google Scholar. Recent advances in our understanding of the process of injury and repair in general, and tubulointerstitial compartment in particular, have helped elucidate some of the important pathogenic events leading to tubulointerstitial nephritis (TIN). These advances have been summarized in several excellent reviews8.Wilson C.B. Nephritogenic tubulointerstitial antigens.Kidney Int. 1991; 39: 501-517Abstract Full Text PDF PubMed Scopus (16) Google Scholar, 9.Nielson E.G. Pathogenesis and therapy of interstitial nephritis (clinical conference).Kidney Int. 1989; 35: 1257-1270Abstract Full Text PDF PubMed Scopus (179) Google Scholar, 10.Jones C.L. Eddy A.A. Tubulointerstitial nephritis.Pediatr Nephrol. 1992; 6: 572-586Crossref PubMed Scopus (40) Google Scholar, 11.Dodd S. The pathogenesis of tubulointerstitial disease and mechanisms of fibrosis.Curr Topic Pathol. 1995; 88: 51-67Crossref PubMed Scopus (11) Google Scholar, 12.Eddy A.A. Experimental insights into the tubulointerstitial disease accompanying primary glomerular lesions.J Am Soc Nephrol. 1994; 5: 1273-1287Crossref PubMed Google Scholar and will only be discussed briefly here. This review focuses primarily on clinical aspect of the diseases where the tubulointerstitial compartment is the primary target of the pathogenic process rather than being secondarily involved by damage to the glomerular, vascular compartment or collecting system. The term acute interstitial nephritis was first used a century ago in 1898 by Councilman in describing a group of patients with systemic bacterial infection, primarily scarlet fever and diphtheria. This term was applied to acute inflammation of the kidney characterized by cellular and fluid exudation in the interstitial tissue that was not dependent on the presence of bacteria13.Councilman W.J. Acute interstitial nephritis.J Exp Med. 1898; 3: 303-420Crossref Scopus (97) Google Scholar. For many decades, the term chronic pyelonephritis was used to describe renal diseases associated with chronic injury to interstitum, despite the lack of evidence for the presence of active infection in a majority of the patients. Beginning in early 1950s, the work of Spuhler and Zollinger in Switzerland on the role of analgesics14.Zollinger H. Spuhler O. Die nicht-eitrige chronische interstitielle Nephritis.Scheizerische Zeitschrift fuer Allgemeine Pathologie. 1950; 13: 807-811PubMed Google Scholar,15.Spuhler O. Zollinger H.U. Die chronisch-interstitielle nephritis.Zeitschrift fuer Med. 1953; Scholar, and and in on the role of in the of chronic tubulointerstitial nephritis Chronic nephritis in Med. Scholar, evidence that the chronic was not in origin. It is that a group of diseases that are to a variety of and pathogenic the between glomerular, vascular and tubulointerstitial a between the clinical of the diseases in the clinical of both on and the severity of renal this are in patients than patients with glomerular These a lack of and the presence of and white blood cell rather than and red blood cell the presence of a in and and the presence of other such as renal nephropathy and to These with progression of renal is important of renal failure and end-stage renal disease The of primary by and of M. nephropathy in the clinical and Int. 13: Full Text PDF PubMed Scopus Google Scholar, of of J Med. PubMed Google Scholar, W. G. M. The in the the of of nephropathy and Nephrol. Scholar, W. A. K. 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Renal and of Tubulointerstitial Scholar. a of a into primary and secondary of or of the disease is of diseases where the pathogenic process in the tubulointerstitial only secondarily other compartments. diseases where the primary pathogenic process in vascular, glomerular or collecting by damage to the tubulointerstitial This is by all and not diseases that than compartment such as systemic systemic lupus or human immunodeficiency virus associated of tubulointerstitial in a of tubulointerstitial nephritis in a the can only in a to a variety of the of can the of the the long-term and in some patients the pathogenesis of the The of the of is dependent on the presence or of a in the diseases where the is the characteristics of the cellular of the in the of with The structural changes of injury include changes injury to in growth including and and the of in the changes include and the of the changes and the presence of renal or other in can tubulointerstitial disease in such a as to the variety of and pathogenic mechanisms that or acute or active of interstitial nephritis the interstitium is and is a cellular that may cells or including of the may be to the of chronic interstitial and is the that may be by only of to a of events where to and the of This process both to the and the of function in chronic interstitial in chronic renal Topic Pathol. 1995; 88: PubMed Scopus Google Scholar. The mechanisms by can renal tubulointerstitial injury can be or by the of systemic or mechanisms are and such as is in and are as in the acute interstitial nephritis associated with nonsteroidal The of the injury may be to some by to the such as renal or that can renal such as the in of can the renal to such as with in and in human disease evidence for mechanisms of tubulointerstitial and have been E.G. Pathogenesis and therapy of interstitial nephritis (clinical conference).Kidney Int. 1989; 35: 1257-1270Abstract Full Text PDF PubMed Scopus (179) Google The in progression of renal Med. Google Scholar. These mechanisms are in some to glomerular disease membrane or other are to the of the and to cell or and by or interstitial dendritic cells to the in cell of and interstitial cells in of a variety of cytokines and growth such as platelet-derived growth factor and transforming growth factor-Β can to and in the tubulointerstitial C.L. Eddy A.A. Tubulointerstitial nephritis.Pediatr Nephrol. 1992; 6: 572-586Crossref PubMed Scopus (40) Google Scholar, 12.Eddy A.A. Experimental insights into the tubulointerstitial disease accompanying primary glomerular lesions.J Am Soc Nephrol. 1994; 5: 1273-1287Crossref PubMed Google Scholar, K.A. the interstitium by platelet-derived growth for renal J Pathol. Google Scholar. of be considered in with renal failure drugs and are major of primary a of drugs the drugs as as and be patients with systemic and systemic the renal be considered in the of a systemic The clinical of the of the disease and severity of renal are between the clinical of glomerular and tubulointerstitial several may between two with to have systemic and and a rate of G. Mc Donald M.A. Appel D. Truong L.D. Chronic tubulo-interstitial nephritis: Correlation between structural and functional findings.Kidney Int. 1990; 38: 736-743Abstract Full Text PDF PubMed Scopus (38) Google A of J Med. Google Scholar. 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These diseases are analgesic-induced granulomatous interstitial nephritis of and interstitial to the of several other such as associated interstitial nephritis to and the interstitial nephritis are not in this are the used in the These primarily in the of the as or for of include such as such as such as and Spuhler and Zollinger in the early to that of patients in Switzerland with interstitial renal disease analgesics14.Zollinger H. Spuhler O. Die nicht-eitrige chronische interstitielle Nephritis.Scheizerische Zeitschrift fuer Allgemeine Pathologie. 1950; 13: 807-811PubMed Google Scholar,15.Spuhler O. Zollinger H.U. Die chronisch-interstitielle nephritis.Zeitschrift fuer Med. 1953; Scholar. the of as factor was not and other several other a between the of and of renal This is by both and this review will the to The of analgesic-induced tubulointerstitial nephritis in in to in to in and to in M. W. S. D. of Renal disease of the Scholar. The of in patients in of of J Med. 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