Highly selective luminescent nanostructures for mitochondrial imaging and targeting

Here a luminescent hybrid nanostructure based on functionalized quantum dots (QDs) is used as a fluorescent imaging agent able to target selectively mitochondria thanks to the molecular recognition of the translocator protein (TSPO). The selective targeting of such an 18 kDa protein mainly located in the outer mitochondrial membrane and overexpressed in several pathological states including neurodegenerative diseases and cancers may provide valuable information for the early diagnosis and therapy of human disorders. In particular, the rational design of amino functionalized luminescent silica coated QD nanoparticles (QD@SiO2 NPs) provides a versatile nanoplatform to anchor a potent and selective TSPO ligand, characterized by a 2-phenyl-imidazo[1,2-a]pyridine acetamide structure along with a derivatizable carboxylic end group, useful to conjugate the TSPO ligand and achieve TSPO-QD@SiO2 NPs by means of a covalent amide bond. The colloidal stability and optical properties of the proposed nanomaterials are comprehensively investigated and their potential as mitochondrial imaging agents is fully assessed. Sub-cellular fractionation, together with confocal laser scanning fluorescence microscopy and co-localization analysis of targeted TSPO-QD@SiO2 NPs in C6 glioma cells overexpressing the TSPO, proves the great potential of these multifunctional nanosystems as in vitro selective mitochondrial imaging agents.

Empowerment: a case study of a grandmother caring for her HIV-positive grandchild

A case study methodology is used to explore the meaning and development of empowerment in a grandmother who is the primary caregiver of a child with HIV infection. Empowerment to this grandmother meant being strong, coming to grips with life's challenges, and then moving on. Empowerment developed over the grandmother's life span as a result of developmental and situational experiences such as motherhood, disclosure of the HIV diagnosis, sharing her positive and negative feelings with others, gaining knowledge about HIV, making management decisions, and her increasing sense of spirituality. This grandmother manifests her empowerment through her public commitment to influence others positively about HIV infections through speaking, writing, and leadership in groups. Clinical implications are discussed.

Boosting social support in caregivers of children with HIV/AIDS

Providing care for a child that is infected with human immunodeficiency virus (HIV) is challenging for the child's caregiver and affects the entire family system. Research has demonstrated that social support has the potential to buffer caregiver stress and facilitate caregiver coping. A two-group experimental study was implemented to test the effect of a social support boosting intervention on caregiver stress, coping and social support among caregivers of children with HIV/acquired immune deficiency syndrome (AIDS). The subjects in the study were caregivers of children with HIV/AIDS. The sample strata included seropositive caregivers (biological parents) and seronegative caregivers (foster parents and extended family members). The measures for the study included the Derogatis Stress Profile, The Family Crisis Oriented Personal Evaluation Scale, and the Tilden Interpersonal Relationship Inventory. These data were then analyzed descriptively and then with a repeated measure MANOVA. Initially, there were no statistically significant differences found between the control and intervention groups. However, when subject HIV status was included in the analysis, the combined dependent variables of stress, coping, and social support were significantly related to the interactions of group by HIV status over time. F values were then computed and no statistically significant differences were found for stress or coping. There were, however, significant differences in measures of social support between groups when adjusting for HIV status of caregivers. In this study, social support levels over time for seronegative caregivers were significantly different from those of seronegative caregivers in the control group. Three case studies are presented that illustrate differences between seronegative and seropositive caregivers. The case studies describe the problems identified by caregivers and the effectiveness of problem solving using the social support boosting intervention. Finally, the mobilization of social support is discussed. Contrasts between the problems of caregivers are made relative to their HIV status. The potential for the effectiveness of the social support boosting intervention is discussed within the context of the caregiver's HIV status.

The experience of being a grandmother who is the primary caregiver for her HIV-positive grandchild

BACKGROUND

The number of grandparents assuming care for their grandchildren is increasing, and this affects grandparents both positively and negatively. The current study builds on an earlier study of the effects of social support, stress, and level of illness on caregiving of children with acquired immune deficiency syndrome (AIDS) that identified both positive and negative effects of caregiving.

OBJECTIVES

To identify the lived experience of African American and Latino grandmothers as the primary caregivers for their grandchildren who are human immunodeficiency virus (HIV)-infected or have AIDS and to identify the similarities and differences between the two groups.

METHODS

Using Van Manen's method for hermeneutical phenomenological research, the lived experiences of 10 African American and Latino grandmothers who were the primary caregivers for their HIV-positive grandchildren were investigated. Additionally, the similarities and differences between the two groups were studied.

RESULTS

Four themes identified were (a) upholding the primacy of the family, (b) living in the child-centered present, (c) being strong as mature women, and (d) living within a constricting environment. Twelve subthemes expanded and clarified the meaning of these themes.

CONCLUSIONS

Although there were differences related to family structure and cultural backgrounds, the grandmothers were more alike than different.

The effect of a social support boosting intervention on stress, coping, and social support in caregivers of children with HIV/AIDS

BACKGROUND

Caring for the human immunodeficiency virus (HIV)-infected child is challenging and affects the entire family system. Studies have shown that social support can mitigate caregiver stress and enhance coping; however, social support may not always result in a positive outcome for the recipient.

OBJECTIVES

To measure caregiver stress, coping, and social support, and to test the effect of a social support boosting intervention on levels of stress, coping, and social support among caregivers of children with HIV/acquired immune deficiency syndrome (AIDS).

METHODS

An experimental design was used with monthly social support boosting interventions implemented. The stratified randomized sample included 70 primary caregivers of children with HIV/AIDS. The sample strata were seropositive caregivers (biological parents) and seronegative caregivers (foster parents and extended family members). Study measures included the Derogatis Stress Profile, Family Crisis Oriented Personal Evaluation Scale, and the Tilden Interpersonal Relationship Inventory. Data were analyzed using descriptive statistics and repeated measure MANOVA.

RESULTS

Statistically significant differences between the experimental and control groups were found on changes in the dependent variables over time when caregiver strata were included as a factor in the analysis; no statistically significant results were found when caregiver strata were combined. Univariate Ftests indicated that the level of social support for caregivers who were seronegative in the experimental group was significantly different from seronegative caregivers in the control group and seropositive caregivers in both groups. No significant treatment group differences were found for seropositive caregivers.

CONCLUSIONS

Seronegative caregivers derived substantial benefit from the social support boosting intervention. Seronegative caregivers who acquire a child with HIV/AIDS are confronted with a complex stressful situation; the critical need to enhance their social support is achievable through the intervention tested in this study.

Effects of social support, stress, and level of illness on caregiving of children with AIDS

The purpose of this descriptive correlational study was to explore the relationship between social support, stressors, level of illness, and perceived caregiver burden in caregivers of children with HIV/AIDS. Instruments used were: (1) the Classification System for Human Immunodeficiency Virus (HIV) Infection in Children Under 13 Years of Age (1987), (2) the Daily Hassles Scale, (3) the Tilden Interpersonal Relationship Inventory (IPRI), (4) the Derogatis Stress Profile (DSP), and (5) the Caregiver Appraisal Scale. The sample was drawn from two medical centers in New Jersey. The 49 caregivers of children with perinatally acquired HIV were predominantly HIV-positive biological mothers of African American descent whose education ranged from 8th grade through college. One-half of the children were classified at the CDC P2 level. Descriptive statistics and stepwise multiple regression were used to analyze the data. The results of the DSP indicated subjects were slightly below the 70th percentile for anxiety, depression, hostility, and work stressors and that subjects' social support levels were in the upper end of the low support category. Stepwise regression indicated that depression and anxiety predicted 40% of the variance in caregiver burden (R2 = .399; F = 14,985; p = .000). Hostility and level of social support predicted 37% of the variance in caregiving impact (R2 = .37; F = 13.254; p = .000). Finally, social support predicted 17.5% of the variability in the caregivers' sense of caregiving competency (R2 = .175; F = 9.788; p = .003). The child's level of illness and HIV status of caregiver did not significantly predict variance in caregiving appraisal.