Born in Gamagori City, Aichi Prefecture, I entered Ehime University School of Medicine after graduating from Aichi Prefectural Jishukan High School with high motivation to be a clinical primary-care doctor at depopulated area. I have been doing judo since I was in elementary school and majored in anatomy (Chair, Professor Yasuo Uehara, a judo club advisor) at graduate school, trained in electron microscopic morphology.

　Following postdoctoral training under JSPS and Professor Uehara at Kumamoto University, I have started my own research concerning to olfactory brain morphology as an Assistant Professor supervised by Professor Toshio Kosaka of Kyushu University, and then come to my current position after working as Associate Professor at Tokushima University School of Medicine. During these times, I received sincere guidance from Professor Emeritus Kiyoshi Hama at the National Institute for Physiological Sciences at Okazaki, Japan, and currently conducts research as a Specially Appointed Professor at Osaka University using ultra-high voltage electron microscopy.

　I would like to have following words in my heart, “Heart is won by Heart. If I don't do it, who will do it?" "Morphology aiming "Beauty is Truth" in order to "withstand the wind and snow of the times". I aim to practice education to foster the next generation of young people, doctors, and medical researchers with a sense of mission and passion.

I teach anatomy and histology for 1st year medical students. My research focuses on the development of the cerebral cortex and its connectivity with subcortical regions. I am particularly interested in how dynamic cell-cell interactions, which are mediated by cell adhesion molecules and vesicular release, regulate cortico-subcortical wiring during development.
　I completed my PhD at the University of Tokyo, where I focused on the regulation of sperm tail movement driven by dynein motor proteins. I did my first post-doctoral research in the group of Dr Masatoshi Takeichi at the RIKEN Center for Developmental Biology (CDB), studying the role of non-clustered protocadherins in brain development. In 2016 I joined the group of Professor Zoltán Molnár at the University of Oxford as a postdoctoral fellow and investigated how neuronal activity regulates the synaptic development of cerebral cortical projections into the thalamus. In 2019 I was appointed as an Associate Professor at Kawasaki Medical School.
Email: s.hayashi(at)med.kawasaki-m.ac.jp

ORCID
https://orcid.org/0000-0001-7209-0007

I am a urologist and I have a broad background in Andrology, with specific training and expertise in basic research using mouse. My clinical and research have focused on rescuing male infertility and developing method preserving fertility of male cancer patients. While Ph. D candidate I succeeded in publishing a paper about production of functional sperm from cryopreserved neonatal testis by culture system. This work showed the best cryopreserving method of testis tissue and reported obtaining a matured sperm from sexually pre-matured cryopreserved neonatal testis in vitro for the first time in the world (Yokonishi et al. Nat commun. 2014). Since I joined Capel laboratory in Duke University, I learned testis development which is helpful to broad my knowledge and find a new approach to my study. Recently I succeed in reporting interesting manipulation of replacing endogenous Sertoli cells by specific drug leads to a male infertility therapy and a major breakthrough in xenogeneic transplantation in mouse result in preserving fertility of young cancer patients (Yokonishi et al. Nat commun. 2020). This project will generate new investigate the interaction between niche and spermatogonial stem cells in testis and testis regeneration.

Education and Training
• Post-doctoral Fellowship, Blanche Capel Lab., Department Of Cell Biology, Duke University, 2014 - 2020
• Ph.D., Takehiko Ogawa Lab., Yokohama City University, Ogawa lab, 2015
• M.D., Showa University, 2006

Email address; yokonishi(at)med.kawasaki-m.ac.jp(Please replace (at) with @.）

I received MSc from Osaka Graduated University, then I worked for a manufacturing company as a researcher. I was involved in product development of cosmetics, beauty device, functional food and clinical research of hair regenerative medicine. Furthermore, I researched the three-dimensional ultrastructure of lamellar granules, which play important role of skin barrier formation, in human epidermis. And I reveled the existence of lanceolate nerve endings surrounding human terminal hair. I received Ph.D. from Tokyo University of Technology. My present research is structural change of neuron in olfactory bulb effected by sexual hormones. In education, I am responsible for histological practice.

In the research, I analyze neural circuits of olfactory bulbs using a ultrastructure analysis method using an electron microscope. In the education, I am in charge of the practice of gross anatomy. Also I am in charge of the practice of osteology. I give lectures on anatomy (splanchnology) at Kawasaki Rehabilitation School, and participates in anatomy practice at Kawasaki University of Medical Welfare and Kawasaki College of Allied Health Professions.

I received my Ph.D at the Okayama University. I was studied about neural circuit and neuroendocrine system of mammals under supervision by Hirotaka Sakamoto Ph.D. I continued my studies as a research fellow of the Japan Society for the Promotion of Science at the above laboratory, where we conducted research on neural circuits that control the sexual function of mammals. Since August 2017, I was appointed to the Kawasaki Medical School as assistant professor in Department of Anatomy. I mainly perform morphological analysis using a light- and electron-microscope for neural circuits of the olfactory bulb in mice. I am mainly responsible for histological anatomy practice.

My doctoral research was elucidation of structure and function in trigeminal primary neurons innervating whisker hair follicles, and I received my Ph.D. in Meiji University of Integrative Medicine, Dept. Anatomy in 2016. After my doctoral course, I belonged Hyogo College of Medicine as a postdoctoral fellow and investigated pain-respiratory response through the parabrachial neuron using electrophysiological methods. In 2018, I joined Dr. Jianguo Gu’s laboratory at the University of Alabama at Birmingham, and I focused on the dysfunction of ion channels at the node of Ranvier in demyelinated motor nerves in mammalian using in situ pressure-patch-clamp recording technique. In 2022, I was appointed an assistant professor at Kawasaki Medical School. My next research is analysis of electrophysiological properties and structures in the olfactory bulb neurons. Also, I get involved in the practice of human anatomy.