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Autosomal dominant polycystic kidney disease
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V. E. TORRES , P. C. HARRIS
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NEFROLOGÍA. Vol. XXIII. Suplemento 1. 2003 Autosomal dominant polycystic kidney disease V. E. Torres and P. C. Harris Division of Nephrology. Mayo Clinic. Rochester, MN. INTRODUCTION Autosomal dominant polycystic kidney disease (ADPKD) is a multisystem disorder characterized by a) bilateral renal cysts; b) cysts in other organs, such as the liver, seminal vesicles, pancreas, and arachnoid membrane; c) extrarenal abnormalities, such as intracranial aneurysms and dolichoectasias, dilatation of the aortic root and dissection of the thoracic aorta, mitral valve prolapse, and abdominal wall hernias, and d) the absence of manifestations suggestive of a different renal cystic disease 1. It is a very common disease, with an estimated prevalence of 1:400 to 1:1,000 live births 2, 3, and the third most common cause of end stage renal failure w o r l d w i d e 4. GENETICS Linkage studies have shown that ADPKD is genetically heterogeneous with two disease loci mapped and identified, on chromosomes 16 (PKD1) and 4 (PKD2) 5-8. A number of unlinked families have also been identified, suggesting the existence of a further locus 9-11. However, the lack of progress toward mapping this locus and the description of a family cosegregating PKD1 and PKD2, with a resulting complex disease pattern, has cast doubt on the existence of a third gene 12. PKD1 and PKD2 are clinically similar diseases with polycystic liver disease and ICAs described in both cases 13, 14. However, there is an important difference in terms of the severity of renal disease, with the average age at the onset of ESRD of 53 years for PKD1 and 69 years for PKD2 15. The PKD1 gene transcribes a large transcript of over 14kb and encodes a protein, polycystin-1, of 4,302a 6, 7. Polycystin-1 in an integral membrane pro- Correspondence: Dr. Vicente E. Torres Mayo Foundation 200 First Street SW Rochester, MN 55901 E-mail: torres.vicente@mayo.edu tein with 11 transmembrane domains, a short cytoplasmic tail and large extracellular region 7, 16. The extracellular part of the protein has homology to many recognized domains which are usually involved in protein-protein or protein-carbohydrate interactions (See fig. 1 for details). Almost 1,400 bp of this region is occupied by 16 PKD repeats, a domain with an immunoglobulin-like fold 17. Significant homology of ~1,000aa is also found with a family of sperm expressed sea urchin proteins that are involved in sperm/egg interactions and triggering the acrosome reaction 18, 19. The overall structure of polycystin-1 suggests a role in cell:cell and/or cell:matrix interactions 20-24. The C-terminal tail of polycystin-1 has previously been show to interact with the corresponding region of polycystin-2 and a variety of other proteins 25, 26, has been shown to tether the protein to the cytoskeleton 24, may bind G proteins 27 and activate Gi/o-type proteins 28. The PKD2 transcript is 5.5kb and encodes a 968aa protein, polycystin-2 8. Polycystin-2 is predicted to have cytoplasmic N- and C-termini and 6 transmembrane domains 8 (See fig. 1 for details). The transmembrane region is homologous to polycystin1 and also voltage activated and transient receptor potential (TRP) channel subunits 29. Recently, functional studies have indicated that the polycystins may act as Ca2+-permeable cation channels 30-32. The physiological location of polycystin-2 (and -1) and the characteristics of the channel require further study. Nevertheless, the likelihood that the normal role of polycystin-2 is in Ca2+ transport and that polycystin1 may have a regulatory role in this process provide the best clues to the basic defect in ADPKD. A location for polycystin-2 on the plasma membrane or ER could be consistent with a role in modulating intra-cellular levels of Ca2+, either allowing entry of extra-cellular Ca2+ or release of Ca2+ from intracellular stores 29,33. Therefore, binding an unknown ligand to the extracellular region of polycystin-1 may activate a polycystin Ca2+ permeable channel. A transient and localized increase in Ca2+ levels could effect many pathways given the known second messenger function of Ca2+. In the disease state mutation to PKD1 or PKD2 (and a possible second hit 14 AUTOSOMAL DOMINANT POLYCYSTIC KIDNEY DISEASE NH2 NH2 Key Signal sequence Leucine rich repeats WSC domain PKD repeat C-type lectin LDL-A related REJ module GPS domain Transmembrane region Voltage activated/TRP channel homology PLAT domain G-protein binding Coiled coil EF-hand TIG domain TIG-like TMEM2 homology DKFZ homology COOH COOH Polycystin-1 NH2 Polycystin-2 COOH Fibrocystin Fig. 1.--Models of the ADPKD proteins, polycystin-1 and polycystin-2 and the ARPKD protein, fibrocystin. Conserved domains and regions of homology with other proteins are shows (see key for details). somatic mutation 34) could lead to loss of functional channels, production of unregulated channels or the generation of channels that leak Ca2+ into the cytoplasm. One aspect of ADPKD research that has proceeded slowly is mutation analysis because of the complex duplicated region encoding PKD1 5, 35. However, in the past 18 months several reports have shown schemes for specific amplification of PKD1 that have allowed complete mutation analysis of this gene 36-38. In particular, DHPLC methods make routine screening for mutation in PKD1 and PKD2 a possibility, with a detection levels of 60-70% 37. These studies have confirmed earlier findings that a wide range of different mutations cause PKD1 and that most families have unique changes, indicating a significant level of new mutation. Mutations are spread throughout the gene but are significantly more frequent in the 3' half 36. Initial analysis of possible genotype/phenotype correlations have indicated considerable intrafamilial phenotypic variability, in terms of the severity of renal disease, as suggested by previous clinical studies 39, 40 and may be partly due to modifying loci or environmental factors. Nevertheless, evidence for a correlation between the site of the mutation and the age at onset of ESRD was detected, with mutations in the 5' half of the gene associated with more severe disease 41. The reason for this phenotype difference is not clear but may be associated with the production of more than one polycystin-1 product from PKD1 due to cleavage or alternative splicing 42. 15 V. E. TORRES and P. C. HARRIS PATHOLOGY AND PATHOGENESIS ADPKD kidneys are typically enlarged and diffusely cystic, but in early stages they may be of normal size and with a limited number of macroscopic cysts scattered in the cortex and medulla 43. Microdissection and histologic studies have shown that cysts develop as outpouchings along a limited number of nephrons and collecting ducts. Analysis of Xchromosome inactivation patterns in epithelial cells isolated from individual supports their derivation from clonal expansion of single cells 44. The genetic events initiating this clonal transformation include loss of heterozygosity or a somatic mutation of the allele unaffected by the germline mutation or possibly somatic mutations of other related genes. The cyst-derived epithelial cells are characterized by a partially dedifferentiated phenotype and an abnormal proliferative response to cyclic AMP agonists that normally inhibit proliferation in the renal tubular epithelial cells 45-48. When the cysts reach ~2 mm in diameter, they become disconnected from the tubules. Accumulation of fluid within these cysts occurs by chloride driven fluid secretion which is also estimulated by cyclic AMP 49. Microscopically, the cysts are characterized by nonpolypoid and by polypoid hyperplasia of the epithelium 50. Despite the frequency of hyperplastic lesions and microscopic adenomas, the incidence of renal cell carcinoma does not appear to be increased, possibly due to the coexisting enhanced rate of apoptosis, or programmed cell death 51. The tubular basement membranes surrounding the cysts are typically thickened and often laminated. The adjacent parenchyma is compressed. Interstitial fibrosis is a prominent finding, even in patients with early disease. It is associated with inflammatory infiltrates consisting of macrophages and lymphocytes. Vascular sclerosis involving both afferent arterioles and interlobular arteries is also prominent. CLINICAL DIAGNOSIS Symptomatic subjects, regardless of age, usually benefit from having a specific diagnosis established. At-risk asymptomatic adult family members may seek testing in order to make personal decisions or to satisfy their «need to know». Those seeking testing should be counseled about possible problems they may encounter with regards to health, life, and disability insurance coverage, employment discrimination, and changes in social and family interaction. Consensus holds that children at risk for adult-onset disorder should not have testing in the absence of 16 symptoms. Prenatal testing for ADPKD is possible using molecular genetic techniques after the mutation has been identified in an affected family member or if linkage has been established in the family. However, only 4% of ADPKD patients or their spouses would terminate a pregnancy for ADPKD 52 and consequently, requests for prenatal testing are rare. The diagnosis of ADPKD is established primarily by imaging studies of the kidneys; however, molecular genetic testing can be used if the imaging results are equivocal or if a definite diagnosis in a young person (less than 30 years) is required, as for a potential renal transplant donor. Molecular genetic testing is not useful in predicting age of onset, severity, type of symptoms, or rate of progression of the disease. Sonographic diagnostic criteria have been established for individuals known to be at 50% risk for the disease 53. They include at least 2 cysts either unilateral or bilateral in patients less than age 30 years, two cysts in each kidney in patients age 3059 years, and four cysts in each kidney in patients age 60 years or older. The sensitivity of these criteria is nearly 100% for all patients with ADPKD who are age 30 years or older and for younger patients with PKD1 mutations, but these criteria are only 67% sensitive for patients with PKD2 mutations who are younger than age 30 years 54. Large echogenic kidneys without distinct macroscopic cysts in an infant/child at 50% risk for ADPKD are diagnostic. In the absence of a family history of ADPKD, the presence of bilateral renal enlargement and cysts, with or without the presence of hepatic cysts, and the absence of other manifestations suggestive of a different renal cystic disease provide presumptive, but not definite, evidence for the diagnosis. Molecular genetic testing can be performed using linkage analysis or direct mutation screening. Linkage analysis with highly informative microsatellite markers flanking the PKD1 and PKD2 genes is possible in large families with several affected family members willing to be tested. Linkage testing is not available to small families or families with a single affected individual and it may be complicated if a de novo mutation has occurred recently in the family. The large size and complexity of the PKD1 gene, as well as marked allelic heterogeneity, present obstacles to molecular testing by mutation analysis. Recently, clinical testing of the PKD1 and PKD2 genes by direct sequencing analysis has become available, but the detection rate for diseasecausing mutations is not yet known 36, 37. Mutationbased approaches have the advantage that only a single sample needs to be examined and, once a AUTOSOMAL DOMINANT POLYCYSTIC KIDNEY DISEASE mutation is identified within a family, testing of other at-risk family members is straightforward. However, the large number of different mutations and wide array of polymorphisms described for the PKD1 gene mean that care is required in interpretation of results to differentiate pathogenic changes from neutral polymorphisms 36, 37. RENAL MANIFESTATIONS The renal manifestations of ADPKD include renal function abnormalities, hypertension, renal pain, and renal insufficiency. Reduction in urinary concentrating capacity and excretion of ammonia may occur early and result from the disruption of the renal architecture by the cysts, interference with the countercurrent exchange and multiplication mechanisms, and defective trapping of solutes and ammonia in the renal medulla. Although the concentrating defect may not have clinical consequences, the reduction of urinary excretion of ammonia in the presence of metabolic stresses, such as dietary indiscretions, may contribute to the development of uric acid and calcium oxalate stones, which, in association with low urine pH values and hypocitric aciduria, occur with increased frequency in ADPKD 55, 56. Another early functional abnormality is a reduction in renal blood flow, which can be detected in young patients, when blood pressures are still normal and before any decline in glomerular filtration rate (GFR). It is characterized by an increase in renal vascular resistance and filtration fraction; high sympathetic nerve activity; normal or high peripheral plasma renin activity; reduced nitric oxide synthesis; resetting of the pressure-natriuresis relationship; salt sensitivity; normal or increased extracellular fluid volume, plasma volume, and cardiac output and partial correction of renal hemodynamics and sodium handling by converting-enzyme inhibition 57. Hypertension in ADPKD may lead to end-organ damage, may increase the morbidity and mortality from associated vascular and cardiac defects and may cause fetal and maternal complications during pregnancy 58. Pain is a common manifestation of ADPKD 59. Potential etiologies include cyst hemorrhage, nephrolithiasis, cyst infection, and rarely, tumor. Discomfort, ranging from a sensation of fullness to severe pain, can also result from renal enlargement and distortion by the cysts. Gross hematuria can occur in association with complications such as cyst hemorrhage and nephrolithiasis or as an isolated event. Passage of clots can also be a source of pain. A cyst hemorrhage can be accompanied by fever. Most often the pain is self-limited and resolves within 2-7 days. Rarely, pain may result from retroperitoneal bleeding, which may be severe and require transfusion. The prevalence of renal stone disease in patients with ADPKD is approximately 20% 55. The majority of stones are composed of uric acid and/or calcium oxalate. Urinary stasis thought to be secondary to distorted renal anatomy and metabolic factors play a role in the pathogenesis. In the past, the incidence of urinary tract infection may have been overestimated in ADPKD because of the frequent occurrence of sterile pyuria. Females experience urinary tract infection more frequently than males and the majority of infections are caused by E. coli and other enterobacteriaceae. Massive renal enlargement can cause complications resulting from compression of local structures, such as inferior vena cava compression and gastric outlet obstruction (mainly by right renal cysts). Approximately 50% of patients with ADPKD have end-stage renal disease (ESRD) at about age 60 years 1. Once renal insufficiency has begun, the average yearly rate of decline in GFR is approximately 5 ml/min 60. Compression of the normal renal parenchyma by expanding cysts, vascular sclerosis, interstitial inflammation and fibrosis, and apoptosis of the tubular epithelial cells are the causative mechanisms. Smoking and the presence of hypertension, hyperlipidemia and proteinuria are associated with an increased risk for disease progression 61. EXTRARENAL MANIFESTATIONS The prevalence of liver cysts in patients with ADPKD increases from 20% in the third decade to approximately 75% after the sixth decade 62. Polycystic liver disease develops at a younger age in women and is more severe in those who have had multiple pregnancies. After menopause, the size of the liver cysts increases in those women who receive estrogen replacement therapy, an observation which suggests that estrogens have an important effect on the progression of polycystic liver disease 63. Liver cysts are usually asymptomatic and never cause liver failure. Symptoms, when they occur, are caused by the mass effect of the cysts, the development of complications, or rare associations. Mass effects include abdominal distention and pain, early satiety, dyspnea and low back pain. Liver cysts can also cause extrinsic compression of the inferior vena cava (IVC), hepatic veins, or bile ducts 64. Complications of polycystic liver disease include cyst hemorrhage, infection, or rupture. Hemorrhagic cysts may cause fever and masquerade as cholecystitis or cyst infec17 V. E. TORRES and P. C. HARRIS tion. Infected cysts cause localized pain or tenderness, fever, leukocytosis, elevated erythrocyte sedimentation rate, and high serum concentration of alkaline phosphatase 65. The rupture of a hepatic cyst can cause acute abdominal pain and ascites. Dilatation of biliary ducts may be associated with episodes of cholangitis. Congenital hepatic fibrosis is very rare in ADPKD and, contrary to the cystic disease, is not transmitted in an autosomal dominant manner. Cholangiocarcinoma is infrequently associated with ADPKD. The most important non-cystic manifestations of ADPKD include intracranial arterial aneurysms and dolichoectasias, dilatation of the aortic root, dissection of the thoracic aorta and cervicocephalic arteries, abnormalities of the cardiac valves, and possibly coronary artery aneurysms 66. Mitral valve prolapse is the most common valvular abnormality. Common to these vascular and cardiac lesions is the disruption of the connective tissue framework responsible for their mechanical properties. It seems likely that the PKD mutations are directly responsible for the vascular and cardiac manifestations of ADPKD, since polycystin and polycystin-2 are strongly expressed in the medial myocytes of elastic and large distributive arteries, as well as in the cardiac myocytes and valvular myofibroblasts 67, 68. Intracranial aneurysms occur in approximately 10% of individuals with ADPKD 66. The prevalence is higher in those with a positive family history of intracranial or subarachnoid hemorrhage (22%) than in those without (6%). The majority of intracranial aneurysms are asymptomatic. Focal findings such as cranial nerve palsy or seizure may result from compression of local structures by an enlarging aneurysm. The risk of rupture of asymptomatic intracranial aneurysms depends on whether there is a history of rupture from a different site 69. In the absence of such history the risk is 0.05% per year for aneurysms less than ten mm, about 1% per year from aneurysms measuring 10-24 mm, and 6% within one year for those measuring 25 mm or more in diameter. When there is a previous history of rupture from a different site, the risk of rupture is 0.5-1% per year regardless of size. The risk of rupture of symptomatic aneurysms is higher, approximately 4% per year. Rupture carries a 35-55% risk of combined severe morbidity and mortality at three months 70. MANAGEMENT Current therapy is directed towards reducing the morbidity and mortality from the renal and extrarenal complications of the disease. 18 The antihypertensive agent(s) of choice in ADPKD has not been clearly established. Because of the role of the renin angiotensin system in the pathogenesis of hypertension in this disease, ACE inhibitors and angiotensin II receptor antagonists may be superior to other agents in patients with preserved renal function. ACE inhibitors, angiotensin II antagonists, and calcium channel blockers increase renal blood flow, have a low side effect profile, and may reduce vascular smooth muscle proliferation and development of atherosclerosis. The administration of ACE inhibitors, but not the administration of calcium channel blockers, has been shown to reduce microalbuminuria in patients with ADPKD 57. In a historical non-randomized study, the administration of ACE inhibitors without diuretics was found to result in a lower rate of decline in GFR and less proteinuria than the administration of a diuretic without an ACE inhibitor for similar control of blood pressure 57. Episodes of cyst hemorrhage or of gross hematuria are self-limited and respond well to conservative management with bed rest, analgesics, and adequate hydration. Rarely, episodes of bleeding are more severe with extensive subcapsular or retroperitoneal hematoma, significant drop in hematocrit, and hemodynamic instability. Such patients require hospitalization, transfusion, and investigation by CT or angiography. In cases of unusually severe or persistent hemorrhage, segmental arterial embolization or surgery may be required. Gross hematuria persisting more than one week or developing for the first time in a patient older than age 50 years requires thorough investigation. The treatment of nephrolithiasis in patients with ADPKD is not different from that in patients without ADPKD. Potassium citrate is the treatment of choice in three conditions associated with ADPKD: uric acid lithiasis, hypocitric calcium oxalate nephrolithiasis, and distal acidification defects 55. Extracorporeal shock-wave lithotripsy and percutaneous nephrostolithotomy can be successful in patients with ADPKD without excessive complications. If cyst infection is suspected, diagnostic imaging should be undertaken to assist in the diagnosis. CT and magnetic resonance imaging (MRI) are sensitive for detecting complicated cysts and provide anatomic definition, but the findings are not specific for infection. Nuclear imaging, especially indium-labeled white cell scanning, is useful, but false-negative and false-positive results are possible. In the appropriate clinical setting, cyst aspiration under ultrasound or CT-guidance should be undertaken to culture the organism and assist in selection of antimicrobial therapy. AUTOSOMAL DOMINANT POLYCYSTIC KIDNEY DISEASE Cyst infection is often difficult to treat. It has a high treatment failure rate despite prolonged therapy with an antibiotic to which the organism is susceptible. Treatment failure results from the inability of certain antibiotics to penetrate the cyst epithelium successfully and achieve therapeutic concentrations within the cysts 71. Lipophilic agents have been shown to penetrate all cysts and have a pKa that allows for favorable electrochemical gradients into acidic cyst fluids. Therapeutic agents of choice include trimethoprim-sulfamethoxazole and fluoroquinolones. Chloramphenicol has shown therapeutic efficacy in otherwise refractory disease. If fever persists after 1-2 weeks of appropriate antimicrobial therapy, percutaneous or surgical drainage of infected cysts should be undertaken. If fever recurs after stopping antibiotics, complicating features, such as obstruction, perinephric abscess, or stones should be considered and treated appropriately. If complicating features are not identified, the course of previously effective therapy should be extended and several months may be required to eradicate infection fully. After excluding causes of flank pain that may require intervention, such as infection, stone, or tumor, an initial conservative approach to pain management is best 59. Nonopioid agents are preferred and care should be taken to avoid long-term administration of nephrotoxic agents such as combination analgesic and nonsteroidal anti-inflammatory drugs. Tricyclic antidepressants are helpful, as in all chronic pain syndromes, and are well tolerated. The use of narcotic analgesics should be reserved for the management of acute episodes, as chronic use can lead to physical and psychologic dependence. Splanchnic nerve blockade with local anesthetics or steroids can result in pain relief beyond the duration of the local anesthetic. When conservative measures fail, therapy can be directed toward cyst decompression with cyst aspiration and sclerosis, surgical cyst decompression, or laparoscopic cyst decompression 59. Cyst aspiration, under ultrasound or CT guidance, is a relatively simple procedure carried out routinely by interventional radiologists. To prevent the reaccumulation of cyst fluid, sclerosing agents such as 95% ethanol or acidic solutions of minocycline are commonly used. In patients with many cysts contributing to pain, laparoscopic or surgical cyst fenestration through lumbotomy or flank incision may be of benefit. Surgical intervention does not accelerate the decline in renal function, but neither does it appear to preserve declining renal function. Laparoscopic fenestration has been shown to be equally effective as open surgical fenestration in short-term follow-up for patients with limited disease, and has a shorter, less complicated recovery period. Recently, laparoscopic and retroperitonoscopic nephrectomy and arterial embolization have been used to treat symptomatic polycystic kidneys in ADPKD patients with ESRD 72, 73. Therapeutic interventions aimed at slowing the progression of renal failure in ADPKD include control of hypertension and hyperlipidemia, dietary protein restriction, control of acidosis, and prevention of hyperphosphatemia. Animal data support the role of dietary protein restriction and careful control of hypertension in slowing the rate of renal failure in PKD 74. The Modification of Diet in Renal Disease (MDRD) trial, however, showed no beneficial effect on renal function of strict, compared with standard, blood pressure control and only a slight beneficial effect of borderline significance of a very low protein diet 60. Since these interventions were introduced at a late state of the disease (GFR 13-55 mL/min per 1.73 m2), these results do not exclude a beneficial effect of earlier interventions. Most patients with polycystic liver disease have no symptoms and require no treatment 62. The treatment of symptomatic disease includes the avoidance of estrogens and the use of H2 blockers or proton pump inhibitors for symptomatic relief. Somatostatin analogues and estrogen antagonists have not been beneficial in small trials or anecdotal reports. Severe symptoms may require percutaneous aspiration and sclerosis, laparoscopic fenestration, combined hepatic resection and cyst fenestration, or liver transplantation. Any of these interventions should be tailored to individual patients. Cyst aspiration and sclerosis with alcohol or minocyline is the treatment of choice for symptoms caused by one or a small number of dominant cysts. There is less experience with laparoscopic fenestration of hepatic cysts. This procedure is complicated by transient ascites in 40% of patients, and the results are often short-lived. Neither percutaneous sclerosis nor laparoscopic fenestration is helpful in highly symptomatic patients with large polycystic livers with many small- and medium-sized cysts. In most cases, part of the liver is spared, allowing treatment by combined hepatic resection and cyst fenestration. The surgery and recovery from this procedure can be difficult, with complications such as transient ascites and bile leaks and a perioperative mortality of 3%. Only specialized centers and surgeons experienced in this surgery should perform this procedure. This surgery has good long-term results in subjects with severe polycystic liver disease. Liver transplantation is reserved for those rare patients without spared segments of liver parenchyma or with hepatic insufficiency 75. Widespread screening for intracranial aneurysms is not cost effective or indicated because most found by 19 V. E. TORRES and P. C. HARRIS screening asymptomatic patients are small, have a low risk of rupture, and require no treatment 66. Indications for screening in 20-50 year-old patients with a good life expectancy include family history of intracranial aneurysms or subarachnoid hemorrhage, previous aneurysmal rupture, preparation for elective surgery with potential hemodynamic instability, highrisk occupations such as airplane pilots, and significant anxiety on the part of the patient despite adequate risk information. Magnetic resonance angiography is the diagnostic imaging modality of choice for presymptomatic screening, as it is noninvasive and does not require intravenous contrast material. For ruptured or symptomatic intracranial aneurysm, the mainstay of therapy is surgical clipping of the ruptured aneurysm at its neck. Asymptomatic aneurysms measuring five mm in diameter or less, diagnosed by presymptomatic screening, can be observed and followed initially at yearly intervals. 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