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Objectives Experiencing dementia-related challenges in a dementia simulation program can be useful for caregivers to understand perspectives of people with dementia possibly leading to improvement in the quality of care and positive outcomes in caregivers and people with dementia. Previous studies about dementia simulation programs have been conducted in Western countries and no research has been conducted in Asian countries. The purpose of this qualitative study was to explore experiences of caregivers of people with dementia who participated in a Korean dementia simulation program. Methods A descriptive phenomenological study using thematic analysis with ATLAS.ti 8 software was used. A total of 28 Korean caregivers were interviewed about two weeks after participating in the Korean dementia simulation program that was modified from a program developed in USA by considering Korean cultures. Results Three key themes with seven subthemes emerged. The present study demonstrated that participation in the program helped caregivers have more empathy, affected their care strategies positively leading to emotional and social benefits on the care dyads, and increased awareness in possible changes due to aging and the risk of dementia. Conclusions The present study was the first study that demonstrated caregivers’ positive experiences in and benefits from participation in a dementia simulation program in an Asian country. Caregivers in the other Asian countries may have similar benefits from participation in dementia simulation programs.

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Although arginase II (ArgII) is abundant in mitochondria, Ca 2+ -accumulating organelles, the relationship between ArgII activity and Ca 2+ translocation into mitochondria and the regulation of cytosolic Ca 2+ signaling are completely unknown. We investigated the effects of ArgII activity on mitochondrial Ca 2+ uptake through mitochondrial p32 protein (p32m) and on CaMKII-dependent vascular smooth muscle cell (VSMC) contraction. Native low-density lipoprotein stimulation induced an increase in [Ca 2+ ]m as measured by CoCl 2 -quenched calcein-AM fluorescence, which was prevented by Arg inhibition in hAoSMCs and reduced in mAoSMCs from ArgII −/− mice. Conversely, [Ca 2+ ]c analyzed with Fluo-4 AM was increased by Arg inhibition and ArgII gene knockout. The increased [Ca 2+ ]c resulted in CaMKII and MLC 20 phosphorylation, which was associated with enhanced vasoconstriction activity to phenylephrine (PE) in the vascular tension assay. Cy5-tagged siRNA against mitochondrial p32 mRNA (sip32m) abolished mitochondrial Ca 2+ uptake and induced activation of CaMKII. Spermine, a polyamine, induced mitochondrial Ca 2+ uptake and dephosphorylation of CaMKII and was completely inhibited by sip32m incubation. In mAoSMCs from ApoE-null mice fed a high-cholesterol diet (ApoE −/− +HCD), Arg activity was increased, and spermine concentration was higher than that of wild-type mice. Furthermore, [Ca 2+ ]m and p32m levels were elevated, and CaMKII phosphorylation was reduced in mAoSMCs from ApoE −/− +HCD. In vascular tension experiments, an attenuated response to vasoconstrictors in de-endothelialized aorta from ApoE −/− +HCD was recovered by incubation of sip32m. ArgII activity-dependent production of spermine augments Ca 2+ transition from the cytosol to the mitochondria in a p32m-dependent manner and regulates CaMKII-dependent constriction in VSMCs.

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