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Original Article

The 14-3-3 Brain Protein in Cerebrospinal Fluid as a Marker for Transmissible Spongiform Encephalopathies

Gary Hsich, M.D., Kimbra Kenney, M.D., Clarence J. Gibbs, Jr., Ph.D., Kelvin H. Lee, Ph.D., and Michael G. Harrington, M.B., Ch.B.

N Engl J Med 1996; 335:924-930September 26, 1996

Abstract

Background

There is no practical and reliable premortem test for Creutzfeldt–Jakob disease and the related transmissible spongiform encephalopathies. Two proteins, designated 130 and 131, which have been detected in low concentrations in cerebrospinal fluid from patients with Creutzfeldt–Jakob disease, appear to be sensitive and specific markers for the disease. Attempts to identify these proteins, however, have been unsuccessful. We hypothesized that they may be present in the normal brain.

Methods

We detected proteins 130 and 131 in normal human brain, partially sequenced their amino acids, and found that they matched the brain protein known as 14-3-3. We then developed a simple, rapid immunoassay for this protein and tested it in cerebrospinal fluid samples from 71 humans and 30 animals with spongiform encephalopathies and in control samples from 186 humans and 94 animals.

Results

The immunoassay detected the 14-3-3 protein in cerebrospinal fluid from 68 of the 71 patients with Creutzfeldt–Jakob disease (96 percent; 95 percent confidence interval, 92 to 99 percent). Among 94 patients with other dementias, the specificity was 96 percent. If one excludes the three patients with dementia who had had strokes within one month before testing, the specificity was 99 percent. The test was positive in 12 of 24 patients with viral encephalitis. In animals the sensitivity of the assay was 87 percent and the specificity was 99 percent.

Conclusions

In patients with dementia, a positive immunoassay for the 14-3-3 brain protein in cerebrospinal fluid strongly supports a diagnosis of Creutzfeldt–Jakob disease. This finding, however, does not support the use of the test in patients without clinically evident dementia.

Media in This Article

Figure 2Immunostaining for Anti–14-3-3β Polyclonal Rabbit Antibody after Sodium Dodecyl Sulfate–Polyacrylamide-Gel Electrophoresis.
Figure 1Regions of Silver-Stained Gels Showing Protein Spots 130 and 131 after Two-Dimensional Electrophoresis.
Article

The transmissible spongiform encephalopathies constitute a group of uniformly fatal neurodegenerative diseases. These diseases include Creutzfeldt–Jakob disease and kuru, among others, in humans,1,2 scrapie in sheep and goats, and spongiform encephalopathy in cattle.3 Spongiform encephalopathies are characterized by spongiform degeneration of the brain, reactive gliosis in the cortical and subcortical gray matter, and the presence of the abnormal isoform of the cellular prion protein.4 These degenerative encephalopathies are transmissible when the infectious agent is experimentally inoculated into laboratory animals.

There is an urgent need for a premortem diagnostic test that can identify humans and animals with transmissible spongiform encephalopathy. Such a test could be useful in patients with iatrogenically transmitted Creutzfeldt–Jakob disease3-5 (especially because of difficulty decontaminating the infectious agent6), as well as in patients with the new strain of Creutzfeldt–Jakob disease possibly linked to bovine spongiform encephalopathy.7 To date, a definitive diagnosis of transmissible spongiform encephalopathy requires histopathological examination of a brain-biopsy specimen. Brain biopsy, however, places patients and health care personnel at risk and may miss the site of disease.

Most cerebrospinal fluid proteins studied in patients with Creutzfeldt–Jakob disease have not proved useful diagnostically.8-11 However, two 30-kd proteins detected by two-dimensional electrophoresis and designated proteins 130 and 131 correlate well with a diagnosis of Creutzfeldt–Jakob disease, with high sensitivity and specificity.12 Identification of these proteins has clarified the premortem diagnosis in several difficult cases,13-16 but the assay technique is not practical for routine clinical use. The development of a simpler assay requires the identification and characterization of proteins 130 and 131, but initial attempts have been hampered by their low concentration in cerebrospinal fluid. We hypothesized that proteins 130 and 131 might be abundant in normal brain tissue, which would facilitate their identification and the development of an immunoassay that could be of use in establishing the diagnosis of Creutzfeldt–Jakob disease without the need for a brain biopsy.

Methods

Cerebrospinal Fluid Specimens

Cerebrospinal fluid specimens from humans or animals with possible diagnoses of transmissible spongiform encephalopathy or from well-studied controls with established diagnoses were submitted to the National Institutes of Health or to the California Institute of Technology. The diagnoses were made by the referring physicians or veterinarians according to standard clinical criteria, as well as pathological studies, as appropriate and available. The specimens from patients with possible Creutzfeldt–Jakob disease were assigned to one of three diagnostic categories on the basis of the available clinical or pathological information: pathologically confirmed, clinically definite (rapidly progressive dementia, myoclonus, and characteristic electroencephalographic findings), or clinically probable (progressive dementia; the presence of cerebrospinal fluid proteins 130 and 131; and myoclonus, ataxia, or characteristic electroencephalographic findings).17 All samples were stored at -70°C without preservative.

Purification and Characterization of Proteins 130 and 131

Sample preparation, two-dimensional electrophoresis, and image analysis of proteins from brain tissue were performed as described elsewhere.18-21 The spot corresponding to protein 130 was excised from electroblotted membranes22 and subjected to amino acid sequencing according to standard methods.23 The partial amino acid sequences obtained were compared with those in the Swiss-Prot data bank with the use of the Basic Local Alignment Search Tool.

14-3-3 Immunoassay in Cerebrospinal Fluid

All tests were conducted without knowledge of the diagnoses, and the method was adapted from that of Brown et al.24 Fifty microliters of cerebrospinal fluid was mixed with 10 μl of sample buffer (5 percent glycerol, 1 percent 2-mercaptoethanol, 1 percent sodium dodecyl sulfate, and a trace of bromophenol blue in the final solution) and boiled for five minutes. Samples were separated by sodium dodecyl sulfate–polyacrylamide-gel electrophoresis (4 percent stacking gel with 12 percent resolving gel at 75 V for three hours) and transferred to nitrocellulose. Immunostaining was performed by blocking with TRIS-buffered saline containing 0.3 percent Tween 20 for 30 minutes, followed by incubation with anti–14-3-3β polyclonal rabbit antibody (Santa Cruz Biotechnology, No. sc-629) at a 1:500 dilution and then by incubation with an alkaline phosphatase–conjugated antirabbit IgG antibody (BioSource International, No. ALI3405) at a 1:1000 dilution. Antigen was detected by colorimetric reaction. Molecular-weight markers and a positive control (cerebrospinal fluid from a patient with confirmed Creutzfeldt–Jakob disease) were included on every gel.

Statistical significance25 was calculated with the chi-square test and Fisher's exact test for two-by-two contingency tables. P values of less than 0.05 were considered to indicate statistical significance. Confidence intervals were calculated with the exact method for a binomial parameter.25

Results

Identification, Characterization, and Verification of Proteins 130 and 131 as 14-3-3

The results of two-dimensional electrophoresis for the detection of cerebrospinal fluid proteins 130 and 131 in patients with Creutzfeldt–Jakob disease are shown in Figure 1AFigure 1Regions of Silver-Stained Gels Showing Protein Spots 130 and 131 after Two-Dimensional Electrophoresis. and Figure 1B. Recent technical improvements have resulted in increased resolution, with six spots rather than the two (corresponding to proteins 130 and 131) originally described. In order to find an abundant source of these proteins, we examined normal brain tissue to determine whether any brain proteins are located near the constellation of spots corresponding to cerebrospinal fluid proteins 130 and 131. Figure 1C shows a region of a silver-stained gel after two-dimensional electrophoresis of normal brain proteins. Several of the proteins appear in the same area as the 130–131 constellation, including two that have the same charge and mass as the 130–131 constellation in cerebrospinal fluid. The identification of the two spots on the basis of their position was confirmed by comigration studies. Spot 130 was purified by narrow-range two-dimensional electrophoresis (pH range, 4.5 to 5.4), as shown in Figure 1D.

Spot 130 was excised from 10 blots, enzymatically digested, and microsequenced. Amino acid sequences were obtained from four peptide fragments. Three of these sequences, Val–Thr–Glu–Leu–Asn–Glu–Pro–Leu–Xaa–Asn–Glu–Asp–Xaa–Asn–Leu–Leu–Ser–Val–Ala, Asp–Tyr–Tyr–Xaa–Tyr–Leu–Ala–Glu–Val–Ala–Thr–Gly–Glu–Lys, and Asn–Val–Val–Xaa–Ala–Arg–Arg–Ser–Ser–Xaa–Arg–Val–Ile–Ser–Ser–Ile–Glu–Gln, matched the sequence of the human 14-3-3 protein, isoform eta. The fourth sequence, Tyr–Ser–Glu–Ala–Xaa–Glu–Ile–Ser, matched the bovine 14-3-3 protein, isoform gamma.

The 14-3-3 antibody reacted specifically with cerebrospinal fluid proteins 130 and 131 on a two-dimensional electrophoretic immunoblot but did not react with other cerebrospinal fluid proteins, thus verifying that cerebrospinal fluid proteins 130 and 131 are 14-3-3 proteins.

14-3-3 Immunoassay

The discovery that the cerebrospinal fluid 30-kd spots (proteins 130 and 131) are 14-3-3 proteins led to the development of a simple immunoassay to aid in the diagnosis of transmissible spongiform encephalopathy. As Figure 2Figure 2Immunostaining for Anti–14-3-3β Polyclonal Rabbit Antibody after Sodium Dodecyl Sulfate–Polyacrylamide-Gel Electrophoresis. shows, in cerebrospinal fluid from patients with Creutzfeldt–Jakob disease, there was a 30-kd immunoreactive band (lanes 2 and 3), whereas no such band was detected in cerebrospinal fluid from healthy controls (data not shown) or from a patient with Alzheimer's disease (lane 1). As expected, 14-3-3 was abundant in an extract of normal human brain (lane 8). the 14-3-3 protein was not found in normal serum (lane 6); however, it was also not detected in serum from patients with Creutzfeldt–Jakob disease (lane 7). Prion protein purified from the brain of a patient with Creutzfeldt–Jakob disease (lane 9) did not cross-react with 14-3-3 antibody, confirming that 14-3-3 is not prion protein.

Sixty-eight of 71 cerebrospinal fluid samples from patients with Creutzfeldt–Jakob disease (96 percent) were positive for 14-3-3 (Table 1Table 1Cerebrospinal Fluid Samples Evaluated with the 14-3-3 Immunoassay, According to Diagnosis. and Table 2Table 2Sensitivity and Specificity of the 14-3-3 Immunoassay for Creutzfeldt–Jakob Disease.). Four of 94 samples (4 percent) from patients with other diseases involving dementia were positive for 14-3-3 (Table 1 and Table 2) (P<0.001). Furthermore, when patients with dementia known to have had acute infarctions of the brain within one month before testing were excluded from the analysis, only 1 of 91 samples (1 percent) was positive (P<0.001). Samples from all 10 patients with multi-infarct dementia but without strokes in the month before testing were negative for 14-3-3. The single false positive result among the cerebrospinal fluid samples from the other patients with dementia was from a patient with a clinical diagnosis of Alzheimer's disease that had not been verified by pathological studies.

14-3-3 was detected in 18 of the 66 cerebrospinal fluid samples (27 percent) from patients with other neurologic illnesses not involving dementia. The 18 positive samples were from patients with acute viral encephalitis, stroke (without dementia) within one month before testing, subarachnoid hemorrhage, or Rett's syndrome. Creutzfeldt–Jakob disease could not reasonably be included in the differential diagnosis of any of these disorders.

Overall, the sensitivity of the 14-3-3 immunoassay as a marker for Creutzfeldt–Jakob disease was 96 percent (68 true positive results divided by 71 true positive and false negative results; 95 percent confidence interval, 92 to 99 percent), and the specificity was 88 percent (164 true negative results divided by 186 true negative and false positive results; 95 percent confidence interval, 84 to 92 percent). More important, the specificity of this assay among all the patients with dementia was 96 percent (90 true negative results divided by 94 true negative and false positive results; 95 percent confidence interval, 90 to 96 percent), and when the three patients with dementia and brain infarction within one month before testing were excluded, the specificity of the immunoassay was 99 percent (90 true negative results divided by 91 true negative and false positive results; 95 percent confidence interval, 97 to 100 percent) (Table 1 and Table 2).

Comparison of Two-Dimensional Electrophoresis and Immunoassay

We compared the two-dimensional electrophoretic assay for proteins 130 and 131 with the 14-3-3 immunoassay in 50 cerebrospinal fluid samples (Table 3Table 3Comparison of Two-Dimensional Electrophoresis for Proteins 130 and 131 and the 14-3-3 Immunoassay.). Thirteen of 15 specimens from patients with Creutzfeldt–Jakob disease were positive with both tests, and the other 2 samples were negative for proteins 130 and 131 but positive for the 14-3-3 protein. The results of the two tests were the same in samples from patients with dementias not associated with Creutzfeldt–Jakob disease or other neurologic disorders. Although the specificities of the two tests are similar, the 14-3-3 immunoassay has a slightly higher sensitivity.

14-3-3 Immunoassay in Animals

The results of the studies in animals were consistent with those of the studies in humans. Figure 2 shows the assay results in cerebrospinal fluid from a normal cow (lane 4) and a cow with pathological evidence of transmissible spongiform encephalopathy (lane 5). As Table 4Table 4Results of the 14-3-3 Immunoassay in Cerebrospinal Fluid Samples from Animals. shows, 14-3-3 protein was detected in cerebrospinal fluid from six of nine cattle with experimentally induced transmissible mink encephalopathy or scrapie. The one cow with clinical features but no pathological evidence of transmissible spongiform encephalopathy also had a positive test. No control cattle had positive assays. The test was positive in five of six sheep with naturally acquired scrapie and was negative in the one control sheep. All 15 experimentally infected chimpanzees had positive tests, whereas none of the 77 control chimpanzees did. The overall sensitivity of the 14-3-3 immunoassay in animals was 87 percent, and the overall specificity was 99 percent.

Discussion

The discovery that proteins 130 and 131 belong to the 14-3-3 family of proteins has permitted the development of a premortem immunoassay of cerebrospinal fluid from humans and animals with transmissible spongiform encephalopathy. The overall specificity of the assay (88 percent) is low because we used a substantial number of cerebrospinal fluid samples from patients with various other conditions, including herpes simplex encephalitis, in which we expected 14-3-3 might be present in cerebrospinal fluid. When the assay was used more selectively, the specificity was very high (99 percent). This finding emphasizes the need to use the 14-3-3 marker as a test only in the appropriate clinical setting. For a patient with dementia, the detection of 14-3-3 in cerebrospinal fluid strongly supports a diagnosis of Creutzfeldt–Jakob disease, provided there has been no recognizable cerebral infarction within the preceding month. However, the one false positive result, in a patient with a clinical diagnosis of Alzheimer's disease, suggests that some caution in interpretation is required until the assay has been evaluated in larger numbers of patients.

The predictive values of this test are governed not only by its sensitivity and specificity but also by the prevalence of Creutzfeldt–Jakob disease in the population tested. For example, in a population in which Creutzfeldt–Jakob disease has a prevalence of 1 percent, a positive test has a predictive value of only 49 percent, but in a population in which the prevalence of Creutzfeldt–Jakob disease is 50 percent, a positive test has a predictive value of 99 percent and a negative test has a predictive value of 95 percent. Therefore, this test will be most useful in patients with clinically suspected Creutzfeldt–Jakob disease. Thus far, the test cannot provide information on the clinical stage, severity, or source of the disease.

Although only a limited number of animals have been tested, the 14-3-3 immunoassay may prove to be a premortem diagnostic test for transmissible spongiform encephalopathy in animals. At this stage, we have not studied animals with other neurologic disorders or cattle in the United Kingdom affected with bovine spongiform encephalopathy. However, the results in cattle with experimentally induced transmissible spongiform encephalopathy or naturally acquired scrapie in sheep suggest that this test will be of help in diagnosing bovine spongiform encephalopathy. At this time, the test cannot provide information on the clinical stage, severity, or source of the disease in animals.

We do not know why the detection of the 14-3-3 protein in cerebrospinal fluid is a useful and specific biochemical marker for transmissible spongiform encephalopathy. The role of 14-3-3 in the pathophysiology of Creutzfeldt–Jakob disease has yet to be determined. This highly conserved protein is found in a broad range of species, including yeast, plants, insects, and mammals, and has a wide variety of functions.27-36 In humans and other mammals, 14-3-3 is a normal neuronal protein consisting of several isoforms, and it plays a part in the conformational stabilization of other proteins.29,33-36 Since misfolded prion proteins are the central feature of Creutzfeldt–Jakob disease, an intriguing additional interpretation for the presence of 14-3-3 in cerebrospinal fluid from patients with this disease is that the protein may be centrally involved in the molecular pathologic features of transmissible spongiform encephalopathy.

We believe that the presence of 14-3-3 in cerebrospinal fluid may be due to massive neuronal disruption and the leakage of brain proteins into cerebrospinal fluid. Increased amounts of 14-3-3 in cerebrospinal fluid from some patients with inflammatory processes37 and the high number of positive assays for 14-3-3 in patients with herpes simplex encephalitis (11 of 12) or recent infarctions (7 of 7) are consistent with this hypothesis. This possibility suggests that the quantity of 14-3-3 present in cerebrospinal fluid should be proportional to the rate and amount of neuronal destruction. We do not have supporting data in humans; however, studies with four experimentally inoculated chimpanzees indicate that 14-3-3 becomes detectable in the cerebrospinal fluid at or just before the onset of clinical signs of disease. Further experiments are required to determine the quantity of 14-3-3 detected in cerebrospinal fluid and the timing of its detection in relation to its clearance in transmissible spongiform encephalopathy.

In summary, we describe an immunoassay that may be of help in the premortem diagnosis of transmissible spongiform encephalopathy in humans and animals. This test can provide objective evidence for the diagnosis of Creutzfeldt–Jakob disease, particularly in the context of a rapidly progressive dementia accompanied by myoclonus or ataxia. The results in animals suggest that the 14-3-3 marker in cerebrospinal fluid reflects the pathological features of transmissible spongiform encephalopathy. The 14-3-3 immunoassay of cerebrospinal fluid can now be widely used to establish the diagnosis of transmissible spongiform encephalopathy in patients and animals.

Supported by grants (NS30531, P30AG1230, and AG05131) from the U.S. Public Health Service.

Drs. Hsich, Kenney, Gibbs, and Harrington have submitted a patent application based on this work. Dr. Harrington is the coinventor of the original two-dimensional electrophoretic test for transmissible spongiform encephalopathy (U.S. patent no. 4,892,814).

We are indebted to the following people for their invaluable contributions of human or animal cerebrospinal fluid: R.T. Johnson and J. McArthur (Johns Hopkins Hospital); W.W. Tourtellotte (National Neurological Research Specimen Bank, West Los Angeles Veterans Affairs Medical Center); F. Lakeman (University of Alabama at Birmingham School of Medicine); D. Galasko (University of California at San Diego School of Medicine); R. Rosenberg and S. Speciale (Alzheimer's Disease Center, University of Texas Southwestern Medical Center); W. Markesberg (University of Kentucky); M. Martin and W.J. Strittmatter (Duke University Medical Center); R. Bradley (Central Veterinary Laboratory, Surrey, United Kingdom); R. Cutlip (Department of Agriculture, Ames, Iowa); J. Hourigan, J. Menchaca, and T. Pickerill (Department of Agriculture, Animal and Plant Health Inspection Service); T. Huff, D. Knowles, and M. Robinson (Department of Agriculture, Agricultural Research Service); and P. Brown (National Institute of Neurological Disorders and Stroke). We are also indebted to Stuart Isaacson for advice; to Joe Creed and Carl Merril for technical instruction on the two-dimensional electrophoretic technique; to Trueman Sharp for assistance with the statistical analysis; to D.C. Gajdusek, P. Brown, L. Cervenàkovà, and T. Weber for comments on the manuscript; and to Miki Yun, Jina Yun, Helen Lee, and Suneil Ramchandani for outstanding technical support.

Source Information

From the Laboratory of Central Nervous System Studies, National Institutes of Health, Bethesda, Md. (G.H., K.K., C.J.G.), and the Biology Division, California Institute of Technology, Pasadena (K.H.L., M.G.H.).

Address reprint requests to Dr. Gibbs at the Laboratory of Central Nervous System Studies, Basic Neurosciences Program, Division of Intramural Research, Bldg. 36, Rm. 4A05, 9000 Rockville Pike, Bethesda, MD 20892-4122, or to Dr. Harrington at Mailstop 139/74, California Institute of Technology, Pasadena, CA 91125.

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