Intraneuronal aluminum accumulation in amyotrophic lateral sclerosis and Parkinsonism-dementia of Guam.

Scanning electron microscopy with energy-dispersive x-ray spectrometry was used to analyze the elemental content of neurofibrillary tangle (NFT)-bearing and NFT-free neurons within the Sommer's sector (H1 region) of the hippocampus in Guamanian Chamorros with amyotrophic lateral sclerosis and parkinsonism-dementia and in neurologically normal controls. Preliminary data indicate prominent accumulation of aluminum within the nuclear region and perikaryal cytoplasm of NFT-bearing hippocampal neurons, regardless of the underlying neurological diagnosis. These findings further extend the association between intraneuronal aluminum and NFT formation and support the hypothesis that environmental factors are related to the neurodegenerative changes seen in the Chamorro population.

Evidence for and against the transmissibility of Alzheimer disease.

Nonhuman primates were inoculated intracerebrally with brain tissue from 52 patients with confirmed Alzheimer disease (AD) in order to investigate the possibility of an infectious etiology. Animals inoculated with brain tissue from two patients with familial AD developed a spongiform encephalopathy that was indistinguishable from Creutzfeldt-Jakob disease (CJD). Seventeen other cases of AD on test for more than 50 months failed to produce similar changes, and 33 cases have not been incubating for a sufficient period of time to ascertain the presence of a transmissible agent. The initial transmission of spongiform encephalopathy with brain tissue from the two familial cases of AD has not been reproduced and the association between AD and an infectious agent has not yet been demonstrated with any reasonable degree of certainty. The frequent overlap of clinical symptoms of AD and CJD, and the occurrence of cases of CJD and AD in the same families indicate the need for continuing research on the relationship between the two diseases.

Probable graft-vs-graft reaction in an infant after exchange transfusion and marrow transplantation.

A newborn with graft-vs-host (GVH) disease following an exchange transfusion was treated by attempting to eradicate the incompatible graft and to reconstitute the child hematologically and immunologically with a bone marrow transplant. The patient was a female term infant (blood group B, Rh+ Coombs test positive) who received a one-unit group O, Rh- exchange transfusion from an unrelated female donor for hyperbilirubinemia due to ABO incompatibility on day 2. Signs of acute GVH disease began on day 8 and the clinical diagnosis was supported by skin biopsy. With antithymocyte globulin and high dose dexamethasone, the GVH reaction improved somewhat. Cyclophosphamide, 200 mg/kg total dose, was given over four days followed by a marrow graft from a brother who was HLA-A, B identical, and probably also D locus compatible in mixed lymphocyte culture. All signs of GVH resolved with cyclophosphamide treatment and hematologic reconstitution was evident by 14 days after transplant. Two weeks later the GVH reaction and aplastic anemia recurred and Y chromatin was detected in only 6% of marrow cells. The infant died on day 80. Autopsy showed disseminated candidiasis, disseminated cytomegalovirus infection, thymic dysplasia, hypoplastic marrow, and other histopathologic changes consistent with GVH disease. The persistence of female cells in blood and bone marrow and the destruction of the reconstituted marrow suggest that the original incompatible transfusion-derived graft was not eliminated and that it ultimately rejected the histocompatible marrow graft.

Epidemiological surveillance of amyotrophic lateral sclerosis and parkinsonism-dementia in the Commonwealth of the Northern Mariana Islands.

Amyotrophic lateral sclerosis (ALS) and parkinsonism-dementia (PD), two fatal neurological diseases of unknown cause, occur in high incidence among the Chamorro people of Guam, the largest and southernmost island within the Mariana archipelago. To reassess and extend our present epidemiological knowledge of these degenerative diseases in this focal geographical region, a systematic search for both disorders was conducted on the remaining inhabited islands of Rota, Tinian, Saipan, and the four remote islands of Anatahan, Alamagan, Pagan, and Agrihan within the Marianas chain. One case of ALS (on Saipan), 2 cases of PD (on Rota and Saipan), and 6 cases of parkinsonism without dementia (2 on Rota, 3 on Saipan, 1 on Tinian) were encountered among the approximately 17,000 inhabitants. No cases of either ALS, PD, or parkinsonism were found in the four remote Northern Islands. An additional 22 cases of ALS and 8 cases of PD were identified from reports of previous case-finding surveys, hospital records, and death certificates. Among Chamorros born on Rota, the average annual age-adjusted mortality rates of ALS per 100,000 population were 37.7 for the 15-year period 1956 to 1970 and 22.5 for the past decade, 1971 to 1980. Among Chamorros born on Saipan, the average annual mortality rates were 7.2 and 3.2 per 100,000, respectively, for the two periods. The mortality rates of PD were also significantly lower on Saipan than on Rota. In general, the age-adjusted mortality rates of ALS and PD on Rota were similar to those currently observed on Guam. Since the origins and current genotypic composition of Chamorros on all the Mariana Islands are indistinguishable, the strikingly lower mortality rates of ALS and PD on Saipan suggest that environmental factors are far more important than genetic factors in the pathogenesis of these diseases.

Cortical bone loss and measurements of the second metacarpal bone. I. Comparisons between adult Guamanian Chamorros and American Caucasians.

The amount of radiographically detectable cortical bone, as determined by measurements of the second metacarpal, was evaluated in 42 male and 45 female Guamanian Chamorros and compared with the degree of bony demineralization in U.S. Caucasians participating in the Baltimore Longitudinal Study on Aging of the Gerontology Research Center. All Chamorros were individually matched to the Caucasian participants for age, sex, and menopause status. Chamorros of both sexes showed bilateral asymmetry in bone measurements and in the amount of cortical bone. Both Chamorro and Caucasian males had longer second metacarpals and more cortical bone than females. Caucasian males, however, had longer and larger second metacarpals than Chamorro males. Despite differences in the length and total width, Chamorro and Caucasian participants generally showed no significant differences in the amount of cortical bone or percent cortical area in the second metacarpal, suggesting that larger bones may not always indicate greater cortical mass. Although cross-sectional data suggested apparent age differences in the onset and rate of bone loss between Chamorros and Caucasians, the numbers of participants were too small to allow meaningful age-by-age statistical comparisons.