Bringing health care information to the deaf community.

BACKGROUND: The Deaf community reports limited access to health promotion information and care. Literature review, key informant interviews, and focus groups generated a clearer understanding of the community. Health care providers, educators, and policymakers could improve medical care to the Deaf community by: 1) better understanding its culture and language; 2) creating more health education programs specifically for the Deaf community; 3) developing opportunities for more deaf people and American Sign Language (ASL) users to enter the health professions; and 4) creating incentives for hearing health care providers to become ASL proficient.

Bringing breast cancer education to deaf women.

BACKGROUND: The Deaf community has not been adequately served by mainstream public health interventions. METHODS: A breast cancer education program adapted for the needs of the Deaf community was evaluated by 123 deaf and hard-of-hearing women using pre- and post-surveys and focus groups. RESULTS: Among the findings were the difficulty of recruiting Deaf community members to education and research programs; low adherence to breast cancer screening guidelines; insufficient breast-health knowledge; endorsement of the program; and suggestions for strengthening it. CONCLUSION: Deaf women will benefit from breast cancer education programs that specifically address their language, culture, and preferred learning styles.

An in-frame trinucleotide repeat in the coding region of the human cellular glutathione peroxidase (GPX1) gene: in vivo polymorphism and in vitro instability.

We report the variation in vivo and instability in vitro of an in-frame GCG trinucleotide repeat in the human cellular glutathione peroxidase (GPX1) gene. In a population study of 110 alleles from 55 unrelated individuals, the allele frequencies for 4, 5, and 6 GCG repeats were 0.40, 0.35, and 0.25, respectively. No allele was associated with diminished enzyme activity. Current stocks of HL-60 cells, a human myeloid leukemia cell line, are homozygous for the 6-repeat allele. Early passage HL-60 cells frozen in 1976 show a 4/6 genotype and "intermediate" passage cells frozen in 1985 contain both 4/6 and 5/6 genotypes. Thus, the expansion of the repeat appears to have developed in the course of multiple passages of the rapidly proliferating cell line.

Interactive video for bilingual ASL/English instruction of deaf children.

Advances in technology make possible certain instructional approaches that heretofore were difficult to implement. One of these advances is the use of computers to present video instructional materials for student-directed learning. In the experimental program described here, we use a bilingual approach to teach aspects of English to deaf children who are fluent in ASL. The goal of this project is to explore ways that ASL and English can be used cooperatively to help deaf students learn more about English.

BioBreeding/Worcester (BB/Wor) rats are deficient in the generation of functional cytotoxic T cells.

The BioBreeding/Worcester (BB/Wor) rat provides a good model of spontaneous autoimmune diabetes. There are several sublines of the BB/Wor rat. The diabetes prone (DP) sublines develop diabetes at a frequency of 50 to 80% from 60 to 120 days of age. The DP rats are lymphopenic, have a severe deficit in phenotypic OX 19+ OX 8+ cytotoxic T cells (Tc), and lack RT 6.1 T cells. These rats have a relative increase in OX 19- OX 8+ natural killer (NK) cells and in NK activity as compared with the diabetes resistant (DR) sublines. The DR sublines have a normal complement of phenotypic Tc and RT 6.1 T cells, fewer NK cells, and lower NK activity than the DP rat. The ability to elicit functional Tc in the BB/Wor rat has not been well studied. In these experiments, by using a model of lymphocytic choriomeningitis virus (LCMV) infection in DP and DR rats, we have studied the functional activity of Tc in these lines. Seven days after infection with LCMV, DR rats develop lymphocytes which are cytotoxic for LCMV-infected syngeneic fibroblasts. These cytotoxic lymphocytes are phenotypic Tc (OX 19+ OX 8+), and do not kill Pichinde virus-infected syngeneic fibroblasts or LCMV-infected allogeneic fibroblasts. This cytotoxic activity is accompanied by an increase in phenotypic Tc from 17 to 33%. DP rats produced neither functional nor phenotypic Tc. These studies confirm that NK cells are the predominant cytotoxic lymphocyte in the BB/Wor rat and suggest that these rats may not utilize a Tc mechanism in islet destruction or another immunologic process such as graft rejection.

Mitogen responsiveness of lymphocytes from the BB/W rat.

The response of BB diabetes-prone (DP) and W-line non-diabetes-prone rats to the T-cell mitogen concanavalin A (ConA) was measured. The W line was a good responder to ConA, whereas the DP was relatively unresponsive. This unresponsiveness could not be reversed with exogenous interleukin 2 (IL-2). The response of DP rats was enhanced by removing adherent cells. To directly test the response of BB T-cells, they were isolated by flow sorting. These experiments demonstrated that BB T-cells could mount a normal ConA response. The normal function of isolated BB T-cells suggested that they were under suppression. Suppressor activity could not be found in the OX8+ population but was found in the DP-adherent cell population. Adherent cells from the W line were not suppressive at the concentrations used. These results showed that the decreased mitogen responsiveness of BB T-cells was not due to an intrinsic T-cell abnormality but was due, in part, to suppression by adherent cells.

Deficiency of phenotypic cytotoxic-suppressor T lymphocytes in the BB/W rat.

The BB/W rat is currently the best model of type I (insulin dependent diabetes). Even though this rat develops an autoimmune disease, they are immune deficient. In this study we have demonstrated the almost complete absence of the OX 8+, OX 19+ T cytotoxic/suppressor population in diabetes prone and acute diabetic rats. This population is present in the diabetes resistant W line. The diabetes prone and acute diabetic rats have a relative increase in OX 8+, OX 19- natural killer (NK) cells. Our data suggests that virtually all OX 8+ cells in diabetes prone and acute diabetic animals are phenotypic NK cells.

Visual-spatial processing in deaf brain-damaged signers.

Sign language displays all the complex linguistic structure found in spoken languages, but conveys its syntax in large part by manipulating spatial relations. This study investigated whether deaf signers who rely on a visual-spatial language nonetheless show a principled cortical separation for language and nonlanguage visual-spatial functioning. Four unilaterally brain-damaged deaf signers, fluent in American Sign Language (ASL) before their strokes, served as subjects. Three had damage to the left hemisphere and one had damage to the right hemisphere. They were administered selected tests of nonlanguage visual-spatial processing. The pattern of performance of the four patients across this series of tests suggests that deaf signers show hemispheric specialization for nonlanguage visual-spatial processing that is similar to hearing speaking individuals. The patients with damage to the left hemisphere, in general, appropriately processed visual-spatial relationships, whereas, in contrast, the patient with damage to the right hemisphere showed consistent and severe visual-spatial impairment. The language behavior of these patients was much the opposite, however. Indeed, the most striking separation between linguistic and nonlanguage visual-spatial functions occurred in the left-hemisphere patient who was most severely aphasic for sign language. Her signing was grossly impaired, yet her visual-spatial capacities across the series of tests were surprisingly normal. These data suggest that the two cerebral hemispheres of congenitally deaf signers can develop separate functional specialization for nonlanguage visual-spatial processing and for language processing, even though sign language is conveyed in large part via visual-spatial manipulation.