Publications by authors named "Stephen H-F Macdonald"

Background: Self-stigma among people who have tuberculosis (TB) can contribute to non-adherence to medication and disengagement from care. It can manifest in feelings of worthlessness, shame, and guilt, leading to social withdrawal and disengagement from life opportunities. Self-stigma may also affect families of those who have TB, or healthcare workers who treat them.

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In an era of emergent infectious disease, the timely and efficient management of disease outbreaks is critical to public health protection. Integrated technologies for case and incident management (CIM) collect real-time health intelligence for decision making in Public Health. In Ireland, a Public Health reform program is preparing for implementation of a health information system for health protection.

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Introduction: The best interventions to address frailty among older adults have not yet been fully defined, and the diversity of interventions and outcome measures makes this process challenging. Consequently, there is a lack of guidance for clinicians and researchers regarding which interventions are most likely to help older persons remain robust and independent. This paper uses meta-analysis to assess effectiveness of primary care interventions for physical frailty among community-dwelling adults aged 60+ and provides an up-to-date synthesis of literature in this area.

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Introduction: Self-stigma-negative self-judgements resulting in shame, worthlessness and self-blame-may play a crucial role in emotional reactions and cause emotional distress among many people living with HIV and other chronic illnesses. Furthermore, self-stigma negatively impacts on self-agency, quality of life, adherence to treatment, and access to services. High levels of self-stigma have been reported across many countries, however few programmes or interventions exist to specifically tackle this phenomenon.

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Background: Depletion of T cells following infection by Mycobacterium tuberculosis (Mtb) impairs disease resolution, and interferes with clinical test performance that relies on cell-mediated immunity. A number of mechanisms contribute to this T cell suppression, such as activation-induced death and trafficking of T cells out of the peripheral circulation and into the diseased lungs. The extent to which Mtb infection of human macrophages affects T cell viability however, is not well characterised.

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Background: Large conductance calcium- and voltage activated potassium (BK) channels are important determinants of neuronal excitability through effects on action potential duration, frequency and synaptic efficacy. The pore- forming subunits are encoded by a single gene, KCNMA1, which undergoes extensive alternative pre mRNA splicing. Different splice variants can confer distinct properties on BK channels.

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Wallerian degeneration of injured neuronal axons and synapses is blocked in Wld(S) mutant mice by expression of an nicotinamide mononucleotide adenylyl transferase 1 (Nmnat-1)/truncated-Ube4b chimeric gene. The protein product of the Wld(S) gene localizes to neuronal nuclei. Here we show that Wld(S) protein expression selectively alters mRNA levels of other genes in Wld(S) mouse cerebellum in vivo and following transfection of human embryonic kidney (HEK293) cells in vitro.

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The pore-forming alpha-subunits of large conductance calcium- and voltage-activated potassium (BK) channels are encoded by a single gene that undergoes extensive alternative pre-mRNA splicing. However, the extent to which differential exon usage at a single site of splicing may confer functionally distinct properties on BK channels is largely unknown. Here we demonstrated that alternative splicing at site of splicing C2 in the mouse BK channel C terminus generates five distinct splice variants: ZERO, e20, e21(STREX), e22, and a novel variant deltae23.

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Large conductance voltage- and calcium-activated potassium (BK(Ca)) channels are important signaling molecules that are regulated by multiple protein kinases and protein phosphatases at multiple sites. The pore-forming alpha-subunits, derived from a single gene that undergoes extensive alternative pre-mRNA splicing, assemble as tetramers. Although consensus phosphorylation sites have been identified within the C-terminal domain of alpha-subunits, it is not known whether phosphorylation of all or single alpha-subunits within the tetramer is required for functional regulation of the channel.

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Large conductance, calcium- and voltage-activated potassium (BK) channels control excitability in many tissues and are regulated by several protein kinases and phosphatases that remain associated with the channels in cell-free patches of membrane. Here, we report the identification of a highly conserved, non-canonical, leucine zipper (LZ1) in the C terminus of mammalian BK channels that is required for cAMP-dependent protein kinase (PKA) to associate with the channel and regulate its activity. A synthetic polypeptide encompassing the central d position leucine residues in LZ1 blocks the regulation of recombinant mouse BK channels by endogenous PKA in HEK293 cells.

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