La regulación de la biosíntesis de hemo en Kluyveromyces lactis: regulación transcripcional de los genes KIHEM1, KlHEM12 y análisis comparativo de los factores reguladores Hap1p y Srb10p en levaduras.

[Resumen] Kluyveromyces lactis es una levadura de elevado interés biotecnológico que se diferencia de la levadura tradicional de estudio Saccharomyces cerevisiae en diversos aspectos de su metabolismo. Mientras que en condiciones de aerobiosis y con glucosa como fuente de carbono K. lactis posee un metabolismo fundamentalmente respirativo, S. cervisiae lo tiene fermentativo en el mismo contexto. Estas diferencias metabólicas podrían ser el reflejo de una diferente regulación transcripcional de aquellos genes relacionados con la respiración en estos organismos tan próximos evolutivamente. En la presente Tesis se estudiaron una serie de genes que se consideran fundamentales en este aspecto. ScHEM1 y ScHEM12 codifican respectivamente la delta-aminolevulinato sintasa y la uroprofirinógeno descarboxilasa que catalizan el primer y quinto paso de la ruta de biosíntesis de hemo. Este grupo estructural de hemoproteínas como los citocromos, que participan en los procesos de respiración. ScHAP1 codifica un factor trascripcional activado por hemo que regula la expresión de genes relacionados con la respiración, y además activa la expresión de ScROX1 que reprime genes hipóxicos en condiciones aeróbicas. ScSRB10 codifica una quinasa que participa en procesos tanto de activación como de represión trascripcional. En estos últimos se caracteriza por interaccionar con el complejo represor Ssn6-Tup1p tras ser reclutado hacia las regiones promotoras de los genes por diversos factores represores, entre los que se encuentra la proteína Rox1p. En este trabajo se han clonado los genes K1HEM12, K1SRB10 y K1HAP1 demostrando para los dos primeros su funcionalidad mediante complementación de mutaciones en genes homólogos en S. cerevisiae. K1HAP1 no ha demostrado ser funcional en S.cerevisiae al menos bajo control de su propio promotor

Efficacy of a computerized cognitive training application for older adults with and without memory impairments

[Abstract] Background/aims It has been shown that cognitive training might help to protect against age-related cognitive decline. Our aim was to evaluate the efficacy of a computerized cognitive training application and its near transfer effects on the cognitive status of older adults. Methods Performance on the 7-Minute Screen at baseline and at the end of the program was analyzed by using a prepost design. Adults aged 55 and older (n = 101; mean age ± standard deviation: 68.97 ± 5.81 years) with and without memory impairments were trained. Results Significant improvements after the training program were found in memory, visuo-spatial and verbal fluency abilities, regardless of age, gender or education. Moreover, participants without significant memory impairments and those with Age-Associated Memory Impairment gained from the program more than subjects with mild cognitive impairment. Conclusion Computerized cognitive training programs, such as Telecognitio , may be used as a practical and valuable tool in clinic to improve cognitive status

Estudio de tres técnicas de concentración de proteína para la determinación del perfil proteico en Condensado de Aire Exhalado

Comunicaciones a congreso

Verbal fluency, naming and verbal comprehension: three aspects of language as predictors of cognitive impairment

[Abstract] Objectives: To establish the possible relationship among three components of language (verbal fluency, naming and comprehension) and cognitive impairment as well as to determine the usefulness of language assessment tests to predict or monitor the development of cognitive impairment. Method: A comparative, descriptive and cross-sectional study was performed on 82 subjects 65 years of age who were cognitively assessed with the Mini Mental State Examination and were divided into two groups: Group A comprised of subjects classified as levels 1, 2 and 3 on the Reisberg’s Global Deterioration Scale (GDS) and group B comprised of subjects at levels 4 and 5 of the GDS. Language skills were assessed by the Verbal Fluency Test, Boston Naming Test and Token Test. Results: An inverse relationship between performance on language tests and cognitive impairment level was observed with a more pronounced effect observed on fluency and comprehension tests. Conclusion: Language assessments, especially fluency and comprehension, were good indicators of cognitive impairment. The use of these assessments as predictors of the degree of cognitive impairment is discussed in-depth

The impact of hearing loss on language performance in older adults with different stages of cognitive function

[Abstract] Purpose. The possible relationship between audiometric hearing thresholds and cognitive performance on language tests was analyzed in a cross-sectional cohort of older adults aged ≥65 years (N=98) with different degrees of cognitive impairment. Materials and methods. Participants were distributed into two groups according to Reisberg’s Global Deterioration Scale (GDS): a normal/predementia group (GDS scores 1–3) and a moderate/moderately severe dementia group (GDS scores 4 and 5). Hearing loss (pure-tone audiometry) and receptive and production-based language function (Verbal Fluency Test, Boston Naming Test, and Token Test) were assessed. Results. Results showed that the dementia group achieved significantly lower scores than the predementia group in all language tests. A moderate negative correlation between hearing loss and verbal comprehension (r=−0.298; P<0.003) was observed in the predementia group (r=−0.363; P<0.007). However, no significant relationship between hearing loss and verbal fluency and naming scores was observed, regardless of cognitive impairment. Conclusion. In the predementia group, reduced hearing level partially explains comprehension performance but not language production. In the dementia group, hearing loss cannot be considered as an explanatory factor of poor receptive and production-based language performance. These results are suggestive of cognitive rather than simply auditory problems to explain the language impairment in the elderly

Efficacy of a computerized cognitive training application on cognition and depressive symptomatology in a group of healthy older adults: a randomized controlled trial

[Abstract] Objective. The purpose of this study was to evaluate the efficacy of a multimedia and interactive cognitive program on cognition and depressive symptomatology in healthy older adults. Methods. Adults aged ≥65 years were randomly assigned to two groups: the experimental group in which the participants received a computerized cognitive training application; and the control group in which the participants received no intervention during the protocol. Performance on the mini-mental state examination (MMSE) and the short-form of the geriatric depression scale (GDS-SF) were analysed using a three-way repeated-measure analysis of variance. Results. To determine cognition after the training, the cognitive program was used and the results were assessed using the MMSE, indicating that the significant time effects within the groups reflected the score for cognitive assessment that was significantly better after the intervention in the experimental group. No significant differences were observed with regard to the depressive symptomatology or between the groups according to sex or educational level on the two dimensions previously established (cognition and depressive symptomatology). Conclusion. The development of technological applications for intervention in older adults is increasing. Based on the established objective, we can conclude that the computerized intervention may constitute a good alternative to enhance the cognitive status in older people

The opinion of professional caregivers about the platform understAID for patients with dementia

Clinical research[Abstract] BACKGROUND: The person with dementia should be treated as an unique person regarding symptoms directly associated with dementia, such as problems with memory, hallucinations, and delusions, as well as other physical, mental, or neurological deficits. The symptoms not directly typical of dementia, such as musculoskeletal disorders or depression, should be also be considered in order to improve the quality of life of a person with dementia. That is why professional caregivers have to broaden their current knowledge not only of medical symptoms but also of the patient’s psychosocial condition and increase their inquisitiveness about the individual condition of the patient. The aim of the study was to get to know the opinion of professional caregivers about the UnderstAID platform and its usefulness for informal caregivers. MATERIAL AND METHODS: Participants in the study group consisted of professional caregivers: nurses, sociologists, psychologists, physiotherapists, and occupational therapists, all of whom specialized in geriatrics and had experience in working with people with dementia. All professional caregivers answered 24 questions that refer to positive and negative aspects of the UnderstAID platform. RESULTS: The study group of professional caregivers highly appreciated that the application could give support to caregivers (mean score of 4.78; 5 points means that they totally agreed, and 1 point means that they totally disagreed) and that a wide range of multimedia materials helped the informal caregivers to gain a better understanding of the contents (mean score of 4.78). There was a statistically significant correlation between the age of the professional caregivers and the frequency of positive opinions that the UnderstAID application gave support to caregivers of relatives with dementia (p=0.028) and the opinion that videos, photos, and pictures may help the informal caregivers to gain a better understanding of the contents (p=0.028). CONCLUSIONS: A group of professional caregivers positively assessed the UnderstAID platform. Caregivers, especially older caregivers, highly appreciated the usefulness of videos, photos, and pictures for gaining a better understanding of the contents.European Commission; AAL5/1/2013European Commission; AAL5/2/201

UnderstAID, an ICT platform to help informal caregivers of people with dementia: a pilot randomized controlled study

[Abstract] Information and communications technology (ICT) could support ambient assisted living (AAL) based interventions to provide support to informal caregivers of people with dementia, especially when they need to cope with their feelings of overburden or isolation. An e-learning platform (understAID application) was tested by informal caregivers from Denmark, Poland, and Spain to explore the technical and the pedagogical specifications, as well as evaluating the impact of its use on the psychological status of the participants. 61 informal caregivers completed the study taking part in the experimental (n=30) or control (n=31) groups. 33.3% of the caregivers were satisfied with the application and around 50% of the participants assessed it as technically and pedagogically acceptable. After using understAID the caregivers in the experimental group significantly decreased their depressive symptomatology according to the Center for Epidemiologic Studies Depression scale, but a possible benefit on their feelings of competence and satisfaction with the caring experience was also observed. The low scores obtained for satisfaction were highlighting issues that need to be modified to meet the informal caregivers’ needs in national, social, and cultural context. Some possible biases are also considered and discussed to be taken into account in future improvements of understAID application.European Commission; AAL-2012-5-10

Predictors of caregiving satisfaction in informal caregivers of people with dementia

[Abstract] Objective. The prevalence of dementia is increasing and consequently the demands from families, institutions and healthcare system. Although a substantial amount of research on caregiving has emphasized the negative aspects of caregiving, specifically on caregiver burden and depression, less attention has been paid to the positive aspects of caregiving. The aim of the present work was to study the phenomenon of caregiving satisfaction in informal caregivers of people with dementia by assessing their likely predictors. Methods. A stress process model was used to study caregiver's satisfaction (measured using the Revised Caregiving Satisfaction Scale) on 101 informal caregivers of patients with dementia in relation to the caregiver's background and context, stress-related factors, and mediators. Results. The regression model has an adjusted R2 of 0.20, which indicates that having a consanguinity relationship with the care recipient, suffering from lower levels of subjective burden, and managing individuals with severe cognitive impairment are the most important predictors of higher caregiving satisfaction. Conclusion. Interventions focused on the enhancement of the caregiving satisfaction by increasing the understanding of the disease, should be especially addressed to caregivers without a consanguinity relationship and with high levels of subjective burden, and to those managing care recipients with mild or moderate stages of dementia.Ministerio de Industria, Energía y Turismo; AAL-2012-5-10

Timed Up and Go Test Performance as an Indicator of Fall History in Institutionalized Elderly: A Pilot Study

Background: Ageing is associated with sensory and physical declines and falling risk. Objective: To determine the association between 3 performance-based mobility tests and fall history. Methods: Fifty participants' mobility was assessed by Timed Up and Go (TUG) and 4- and 6-m walking tests (WT). Results: The TUG performance correlated with 4- and 6-m WT performance, and performance on 4-m WT positively correlated with 6-m WT. Only TUG performance showed a strong relationship to fall history. Conclusions: Performance tests could indicate the presence of fall history in the institutionalized older adults; the TUG being the most suitable compared with other common WT