Autosomal dominant polycystic kidney disease
|Polycystic Kidney Disease|
|Classification and external resources|
Autosomal dominant polycystic kidney disease (ADPKD, autosomal dominant PKD or adult-onset PKD) is the most prevalent, potentially lethal, monogenic human disorder. It is associated with large interfamilial and intrafamilial variability, which can be explained to a large extent by its genetic heterogeneity and modifier genes. It is also the most common of the inherited cystic kidney diseases — a group of disorders with related but distinct pathogenesis, characterized by the development of renal cysts and various extrarenal manifestations, which in case of ADPKD include cysts in other organs, such as the liver, seminal vesicles, pancreas, and arachnoid membrane, as well as other abnormalities, such as intracranial aneurysms and dolichoectasias, aortic root dilatation and aneurysms, mitral valve prolapse, and abdominal wall hernias. Over 50% of patients with ADPKD eventually develop end stage kidney disease and require dialysis or kidney transplantation. ADPKD is estimated to affect at least 1 in every 1000 individuals worldwide, making this disease the most common inherited kidney disorder with a diagnosed prevalence of 1:2000 and incidence of 1:3000-1:8000 in a global scale.
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In many patients with ADPKD, kidney disfunction is not clinically apparent until forty or fifty years of life. There is, however, an increasing body of evidence that suggests the formation of renal cysts starts in utero. Cysts initially form as small dilations in renal tubules, which then expand to form fluid-filled cavities of different sizes. Factors suggested to lead to cystogenesis include a germline mutation in one of the polycystin gene alleles, a somatic second hit that leads to the loss of the normal allele, and a third hit, which can be anything that triggers cell proliferation, leading to the dilation of the tubules. In the progression of the disease, continued dilation of the tubules through increased cell proliferation, fluid secretion, and separation from the parental tubule lead to the formation of cysts.
ADPKD, together with many other diseases that present with renal cysts, can be classified into a family of diseases known as ciliopathies. Epithelial cells of the renal tubules, including all the segments of the nephron and the collecting ducts (with the exception of intercalated cells) show the presence of a single primary apical cilium. Polycystin-1, the protein encoded by the PKD1 gene, is present on these cilia and is thought to sense the flow with its large extracellular domains, activating the calcium channels associated with polycystin-2, the product of gene PKD2, as a result of the genetic setting of ADPKD as explained in the genetics sub-section below.
Epithelial cell proliferation and fluid secretion that lead to cystogenesis are two hallmark features in ADPKD. During the early stages of cystogenesis, cysts are attached to their parental renal tubules and a derivative of the glomerular filtrate enters the cysts. Once these cysts expand to approximately 2 mm in diameter, the cyst closes off from its parental tubule and after that fluid can only enter the cysts through transepithelial secretion, which in turn is suggested to increase due to secondary effects from an increased intracellular concentrations of cyclic AMP (cAMP).
Clinically, the insidious increase in the number and size of renal cysts translates as a progressive increment in kidney volume. Trail-blazing studies led by Mayo Clinic professionals established that the total kidney volume (TKV) in a large cohort of ADPKD patients was 1060 ± 642ml with a mean increase of 204ml over three years, or 5.27% per year in the natural course of the disease, among other important, novel findings that were extensively studied for the first time.
ADPKD is genetically heterogeneous with two genes identified: PKD1 (chromosome region 16p13.3; around 85% cases) and PKD2 (4q21; around 15% cases). Several genetic mechanisms probably contribute to the phenotypic expression of the disease. Although there is evidence for a two-hit mechanism (germline and somatic inactivation of two PKD alleles) explaining the focal development of renal and hepatic cysts, haploinsufficiency is more likely to account for the vascular manifestations of the disease. Additionally, new mouse models homozygous for Pkd1 hypomorphic alleles 22 and 23 and the demonstration of increased renal epithelial cell proliferation in Pkd2+/− mice suggest that mechanisms other than the two-hit hypothesis also contribute to the cystic phenotype.
There is large interfamilial and intrafamilial variability in ADPKD. Most individuals with PKD1 mutations have renal failure by age 70 years, whereas more than 50% of individuals with PKD2 mutations have adequate renal function at that age (mean age of onset of end-stage renal disease: 54·3 years with PKD1; 74·0 years with PKD2).
The significant intrafamilial variability observed in the severity of renal and extrarenal manifestations points to genetic and environmental modifying factors that may influence the outcome of ADPKD, and results of an analysis of the variability in renal function between monozygotic twins and siblings support the role of genetic modifiers in this disease. It is estimated that 43–78% of the variance in age to ESRD could be due to heritable modifying factors, with parents as likely as children to show more severe disease in studies of parent-child pairs.
Usually, the diagnosis of ADPKD is initially performed by renal imaging using ultrasound, CT scan, or MRI. However, molecular diagnostics can be necessary in the following situations: 1- when a definite diagnosis is required in young individuals, such as a potential living related donor in an affected family with equivocal imaging data; 2- in patients with a negative family history of ADPKD, because of potential phenotypic overlap with several other kidney cystic diseases; 3- in families affected by early-onset polycystic kidney disease, since in this cases hypomorphic alleles and/or oligogenic inheritance can be involved; and 4- in patients requesting genetic counseling, especially in couples wishing a pre-implantation genetic diagnosis.
The findings of 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. In some cases, intracranial aneurysms can be an associated sign of ADPKD, and screening can be recommended for patients with a family history of intracranial aneurysm.
Molecular genetic testing by linkage analysis or direct mutation screening is clinically available; however, genetic heterogeneity is a significant complication to molecular genetic testing. Sometimes a relatively large number of affected family members need to be tested in order to establish which one of the two possible genes is responsible within each family. The large size and complexity of PKD1 and PKD2 genes, as well as marked allelic heterogeneity, present obstacles to molecular testing by direct DNA analysis. The sensitivity of testing is nearly 100% for all patients with ADPKD who are age 30 years or older and for younger patients with PKD1 mutations; these criteria are only 67% sensitive for patients with PKD2 mutations who are younger than age 30 years.
Currently, the only clinical/pharmacological treatment available for ADPKD consists in reducing the speed in gain of total kidney volume (TKV) with aquaretics (i.e. tolvaptan), which can alleviate pain while giving the patients a better quality of life for over a mean of 3 years. After this period, patients can restart gaining TKV at pre-treatment rates and may eventually have to go through dialysis and kidney transplant. Paliative treatment modalities involve symptomatic medications (non-opioid and opioid analgesics) for abdominal/retroperitoneal pain. Before the advent of aquaretic medication, the only option for analgesic-resistant pain were simple or complex surgical procedures (i.e. renal cyst aspiration, cyst decortication, renal denervation and nephrectomy), which can result in complications inherent to surgery.
In 2014, Japan was the first country in the world to approve a pharmacological treatment for ADPKD followed by Canada and Europe, which approved the drug tolvaptan for ADPKD patients in the beginning of 2015. Tolvaptan, an aquaretic drug, is a vasopressin receptor 2 (V2) antagonist. Pre-clinical studies had suggested that the molecule cAMP could be involved in the enlargement of ADPKD cysts, and studies on rodents confirmed the role of vasopressin in increasing the levels of cAMP in the kidney, which laid the basis for the conduction of clinical studies. Because data from the Consortium for Radiologic Imaging Studies of Polycystic Kidney Disease (CRISP) led by Mayo Clinic showed that total kidney volume (TKV) predicted the risk of developing renal insufficiency in patients with ADPKD, the TEMPO 3:4 trial, which enrolled patients from 129 sites worldwide from 2007 to 2009, evaluated TKV as a primary end-point to test the efficacy of tolvaptan in ADPKD patients. That study showed a significant decrease in the ratio of TKV increase and deterring of renal function decline in ADPKD patients after treatment with tolvaptan; however, because laboratory test results regarding liver function appeared elevated in a percentage of patients enrolled in that study, the approval of the drug was either delayed by regulatory agencies or, as in case of the US, altogether denied.
Chronic pain in patients with ADPKD is often refractory to conservative, non-invasive treatments, but non-opioid analgesics and conservative interventions can be first used before opioid analgesics are considered; if pain continues, then surgical interventions can target renal or hepatic cysts in order to directly address the cause of pain, with surgical options including renal cyst decortication, renal denervation, and nephrectomy.
Renal cyst aspiration
Aspiration with ethanol sclerotherapy can be performed for the treatment of symptomatic simple renal cysts, but can be impractical in advanced patients with multiple cysts. The procedure itself consists in the percutaneous insertion of a needle into the identified cyst, under ultrasound guidance, with subsequent draining the contained liquid; the sclerotherapy is used to avoid liquid reaccumulation that can occur in the cyst, which can result in symptom recurrence.
Laparoscopic cyst decortication
Laparoscopic cyst decortication (also referred to as marsupialization) consists in the removal of one or more kidney cysts through laparoscopic surgery, during which cysts are punctured, and the outer wall of the larger cysts is excised with care not to incise the renal parenchyma. This procedure can be useful for pain relief in patients with ADPKD, and is usually indicated after earlier cyst aspiration has confirmed that the cyst to be decorticated is responsible for pain. Non-randomised controlled trials conducted in the 90s showed that patients with symptomatic simple renal cysts who had recurrence of symptoms after initial response to simple aspiration could be safely submitted to cyst decortication, with a mean pain-free life between 17 and 24 months after surgery. Laparoscopic decortication presents a 5% recurrence rate of renal cysts compared to an 82% recurrence rate obtained with sclerotherapy.
Many ADPKD patients suffer symptomatic sequelae in consequence of the disease, such as cyst hemorrhage, flank pain, recurrent infections, nephrolithiasis, and symptoms of mass effect (i.e., early satiety, nausea and vomiting, and abdominal discomfort), from their enlarged kidneys. In such cases, nephrectomy can be required due to intractable symptoms or when, in the course of preparing for renal transplantation, the native kidneys are found to impinge upon the true pelvis and preclude the placement of a donor allograft. Additionally, native nephrectomy may be undertaken in the presence of suspected malignancy, as renal cell carcinoma (RCC) is 2 to 3 times more likely in the ADPKD population in end stage renal disease (ESRD) than in the ESRD patients without ADPKD. Although the indications for nephrectomy in ADPKD may be related to kidney size, the decision to proceed with native nephrectomy is often undertaken on an individual basis, without specific reference to kidney size measurements.
Two modalities of dialysis can be used in the treatment of ADPKD patients: peritoneal dialysis and hemodialysis. Epidemiological data shows that ADPKD affects 5-13.4% of patients undergoing hemodialysis in Europe and in the United States, and about 3% in Japan. Peritoneal dialysis has usually been contra-indicated in ADPKD patients with large kidney and liver volumes, due to expected physical difficulties in the procedure and possible complications; however, recent studies suggest there is no difference in long term morbidity between hemodialysis and peritoneal dialysis in ADPKD.
It is accepted that kidney transplantation is the preferred treatment for ADPKD patients with end-stage renal disease (ESRD). Among American patients on the kidney transplant waiting list (as of December 2011), 7256 (8.4%) were listed due to cystic kidney disease and of the 16,055 renal transplants performed in 2011, 2057 (12.8%) were done for patients with cystic kidney disease, with 1,189 from deceased donors and 868 from living donors.
In ADPKD patients, gradual cyst development and expansion result in kidney enlargement, and during the course of the disease, glomerular filtration rate (GFR) remains normal for decades before kidney function starts to progressively deteriorate, making early prediction of renal outcome difficult. The CRISP study, mentioned in the treatment section above, contributed to build a strong rationale supporting the prognostic value of total kidney volume (TKV) in ADPKD; TKV (evaluated by MRI) increases steadily and a higher rate of kidney enlargement correlated with accelerated decline of GFR, while patient height-adjusted TKV (HtTKV) ≥600 ml/m predicts the development of stage 3 chronic kidney disease within 8 years.
Besides TKV and HtTKV, the estimated glomerular filtration rate (eGFR) has also been tentatively used to predict the progression of ADPKD. After the analysis of CT or MRI scans of 590 patients with ADPKD treated at the Mayo Translational Polycystic Kidney Disease Center, Irazabal and colleagues developed an imaging-based classification system to predict the rate of eGFR decline in patients with ADPKD. In this prognostic method, patients are divided into five subclasses of estimated kidney growth rates according to age-specific HtTKV ranges (1A, <1.5%; 1B, 1.5–3.0%; 1C, 3.0–4.5%; 1D, 4.5–6.0%; and 1E, >6.0%) as delineated in the CRISP study. The decline in eGFR over the years following initial TKV measurement is significantly different between all five patient subclasses, with those in subclass 1E having the most rapid decline.
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