Immunohistochemical analysis of adenosine deaminase in rat brain revealed an extensive plexus of adenosine deaminase-containing neurons in the basal hypothalamus. These neurons converged on and were most numerous in three major centers, namely, the tuberal, caudal, and postmammillary caudal magnocellular nuclei. Most other brain regions were devoid of cells containing adenosine deaminase. Some adenosine deaminase-containing neurons were retrogradely labeled with the fluorescent dye fast blue when the dye was injected into the frontal cortex and striatum. Specific populations of neurons having high levels of adenosine deaminase may release adenosine as a neurotransmitter.
Background There is a complicated and exploitative history of research with Indigenous peoples and accompanying calls to meaningfully and respectfully include Indigenous knowledge in healthcare. Storytelling approaches that privilege Indigenous voices can be a useful tool to break the hold that Western worldviews have within the research. Our collaborative team of Indigenous and non-Indigenous researchers, and Indigenous patients, Elders, healthcare providers, and administrators, will conduct a critical participatory, scoping review to identify and examine how storytelling has been used as a method in Indigenous health research. Methods Guided by two-eyed seeing, we will use Bassett and McGibbon’s adaption of Arksey and O’Malley’s scoping review methodology. Relevant articles will be identified through a systematic search of the gray literature, core Indigenous health journals, and online databases including Scopus, MEDLINE, Embase, CINAHL, AgeLine, Academic Search Complete, Bibliography of Native North Americans, Canadian Reference Centre, and PsycINFO. Qualitative and mixed-methods research articles will be included if the researchers involved Indigenous participants or their healthcare professionals living in Turtle Island (i.e., Canada and the USA), Australia, or Aotearoa (New Zealand); use storytelling as a research method; focus on healthcare phenomena; and are written in English. Two reviewers will independently screen titles/abstracts and full-text articles. We will extract data, identify the array of storytelling approaches, and critically examine how storytelling was valued and used. An intensive collaboration will be woven throughout all review stages as academic researchers co-create this work with Indigenous patients, Elders, healthcare professionals, and administrators. Participatory strategies will include four relational gatherings throughout the project. Based on our findings, we will co-create a framework to guide the respectful use of storytelling as a method in Indigenous health research involving Indigenous and non-Indigenous peoples. Discussion This work will enable us to elucidate the extent, range, and nature of storytelling within Indigenous health research, to critically reflect on how it has been and could be used, and to develop guidance for the respectful use of this method within research that involves Indigenous peoples and settlers. Our findings will enable the advancement of storytelling methods which meaningfully include Indigenous perspectives, practices, and priorities to benefit the health and wellbeing of Indigenous communities. Systematic review protocol registration Open Science Framework (https://osf.io/rvf7q)
Adenosine deaminase (ADA) was detected immunohistochemically in neuronal cell bodies of dorsal root ganglia (DRG) of the rat. ADA-immunoreactivity was confined exclusively to small type B ganglion neurons in cervical, thoracic and lumbar sensory ganglia; large type A neurons in sensory ganglia were devoid of immunostaining for ADA. It was consistently found that only a small proportion of type B neurons in DRG contain immunohistochemically detectable ADA. It is suggested that the expression of high ADA levels is a distinguishing feature of a subpopulation of type B DRG neurons and, further, that ADA in these neurons may reflect their utilization of purines (adenosine or adenine nucleotides) as transmitters or cotransmitters.
The influence of capsaicin on autotomy was studied in adult rats in which the sciatic and saphenous nerves were sectioned. Capsaicin was administered subcutaneously to neonatal rats or applied topically to the sciatic and saphenous nerves in adult animals. Quantification of neurogenic plasma extravasation in skin areas subserved by these nerves and of the number of small type B neurones in lumbar sensory ganglia were used to confirm the effectiveness of capsaicin-induced lesions of unmyelinated sensory nerves. Neonatal capsaicin treatment significantly reduced neuronal numbers in ganglia and, compared to control responses, plasma extravasation was nearly abolished after both neonatal and peripheral nerve treatment with capsaicin. Despite these deficits in sensory neurones function, no differences in any parameters of autotomy were observed between animals receiving both capsaicin treatment and nerve section and those given nerve section alone. Animals in both control and experimental groups exhibited high autotomy scores. These results suggest that capsaicin-sensitive primary sensory neurones do not have a significant role in precipitating autotomy characterized by high incidence and severity.
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