Publications by authors named "Kosuke Morioka"

4 Publications

  • Page 1 of 1

Insight Into the Ontogeny of GnRH Neurons From Patients Born Without a Nose.

J Clin Endocrinol Metab 2020 05;105(5)

Clinical Research Branch, National Institute of Environmental Health Sciences, Durham, North Carolina.

Context: The reproductive axis is controlled by a network of gonadotropin-releasing hormone (GnRH) neurons born in the primitive nose that migrate to the hypothalamus alongside axons of the olfactory system. The observation that congenital anosmia (inability to smell) is often associated with GnRH deficiency in humans led to the prevailing view that GnRH neurons depend on olfactory structures to reach the brain, but this hypothesis has not been confirmed.

Objective: The objective of this work is to determine the potential for normal reproductive function in the setting of completely absent internal and external olfactory structures.

Methods: We conducted comprehensive phenotyping studies in 11 patients with congenital arhinia. These studies were augmented by review of medical records and study questionnaires in another 40 international patients.

Results: All male patients demonstrated clinical and/or biochemical signs of GnRH deficiency, and the 5 men studied in person had no luteinizing hormone (LH) pulses, suggesting absent GnRH activity. The 6 women studied in person also had apulsatile LH profiles, yet 3 had spontaneous breast development and 2 women (studied from afar) had normal breast development and menstrual cycles, suggesting a fully intact reproductive axis. Administration of pulsatile GnRH to 2 GnRH-deficient patients revealed normal pituitary responsiveness but gonadal failure in the male patient.

Conclusions: Patients with arhinia teach us that the GnRH neuron, a key gatekeeper of the reproductive axis, is associated with but may not depend on olfactory structures for normal migration and function, and more broadly, illustrate the power of extreme human phenotypes in answering fundamental questions about human embryology.
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May 2020

Effects of combination therapy using basic fibroblast growth factor and mature adipocyte-derived dedifferentiated fat (DFAT) cells on skin graft revascularisation.

J Plast Surg Hand Surg 2015 6;49(4):229-33. Epub 2015 Mar 6.

Department of Plastic and Reconstructive Surgery, School of Medicine .

Background: Although the benefits of basic fibroblast growth factor (bFGF) for wound healing and angiogenesis are well known, its effects on the process of skin graft revascularisation have not been clarified. It was hypothesised that bFGF would be beneficial to promote taking of skin grafts, but that the effect might be limited in the case of bFGF monotherapy. Therefore, this study investigated the efficacy of combination therapy using bFGF and dedifferentiated fat (DFAT) cells. DFAT cells have multilineage differentiation potential, including into endothelial cells, similar to the case of mesenchymal stem cells (MSC).

Methods: Commercially available human recombinant bFGF was used. DFAT cells were prepared from SD strain rats as an adipocyte progenitor cell line from mature adipocytes. Full-thickness skin was lifted from the back of SD strain rats and then grafted back to the original wound site. Four groups were established prior to skin grafting: control group (skin graft alone), bFGF group (treated with bFGF), DFAT group (treated with DFAT cells), and combination group (treated with both bFGF and DFAT cells). Tissue specimens for histological examination were harvested 48 hours after grafting.

Results: The histological findings for the bFGF group showed vascular augmentation in the grafted dermis compared with the control group. However, the difference in the number of revascularised vessels per unit area did not reach statistical significance against the control group. In contrast, in the combination group, skin graft revascularisation was significantly promoted, especially in the upper dermis.

Conclusion: The results suggest that replacement of the existing graft vessels was markedly promoted by the combination therapy using bFGF and DFAT cells, which may facilitate skin graft taking.
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April 2016

Insulin resistance in SHR/NDmc-cp rats correlates with enlarged perivascular adipocytes and endothelial cell dysfunction in skeletal muscle.

J Nutr Sci Vitaminol (Tokyo) 2014 ;60(1):52-9

Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi.

Ectopic adipose tissue in skeletal muscle is implicated in the development of insulin resistance, which is frequently induced by abnormal dietary habits such as excessive eating and a high-fat diet. However, the characteristics of ectopic adipocytes are unknown. In this study, we investigated the characteristics of ectopic adipocytes in the skeletal muscle of spontaneously hypertensive corpulent congenic (SHR/NDmc-cp) rats as a model of insulin resistance from excessive eating. SHR/NDmc-cp rats displayed overt insulin resistance with high plasma glucose, insulin, and triacylglycerol concentrations relative to control Wistar-Kyoto (WKY) rats. In contrast, streptozotocin (STZ)-treated WKY rats had high glucose but low insulin concentrations. Ectopic adipocytes were found around blood vessels in the gastrocnemius in SHR/NDmc-cp rats. Areas of perivascular adipocytes and protein expression of resistin were greater in SHR/NDmc-cp rats than in control and STZ-treated WKY rats. The level of the phosphorylated (active) form of endothelial nitric oxide synthase in the gastrocnemius was lower in SHR/NDmc-cp rats than in the other groups. Insulin-resistant SHR/NDmc-cp rats showed enlarged perivascular adipocytes and greater endothelial cell dysfunction in the gastrocnemius.
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December 2014

Successful management of a critically ill burn patient suffering sepsis by use of endotoxin absorption therapy (PMX).

Burns 2004 May;30(3):276-9

Department of Plastic and Reconstructive Surgery, Tokyo Women's Medical University, Tokyo, Japan.

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May 2004