Details of a Researcher - Sasaki, Takashi

Papers - Sasaki, Takashi

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Induction of hair follicle dermal papilla cell properties in human induced pluripotent stem cell-derived multipotent LNGFR(+)THY-1(+) mesenchymal cells

Veraitch, O., Mabuchi, Y., Matsuzaki, Y., Sasaki, T., Okuno, H., Tsukashima, A., Amagai, M., Okano, H. and Ohyama, M.

Sci Rep 7 42777 2017.02

ISSN 2045-2322

The dermal papilla (DP) is a specialised mesenchymal component of the hair follicle (HF) that plays key roles in HF morphogenesis and regeneration. Current technical difficulties in preparing trichogenic human DP cells could be overcome by the use of highly proliferative and plastic human induced pluripotent stem cells (hiPSCs). In this study, hiPSCs were differentiated into induced mesenchymal cells (iMCs) with a bone marrow stromal cell phenotype. A highly proliferative and plastic LNGFR(+)THY-1(+) subset of iMCs was subsequently programmed using retinoic acid and DP cell activating culture medium to acquire DP properties. The resultant cells (induced DP-substituting cells [iDPSCs]) exhibited up-regulated DP markers, interacted with human keratinocytes to up-regulate HF related genes, and when co-grafted with human keratinocytes in vivo gave rise to fibre structures with a hair cuticle-like coat resembling the hair shaft, as confirmed by scanning electron microscope analysis. Furthermore, iDPSCs responded to the clinically used hair growth reagent, minoxidil sulfate, to up-regulate DP genes, further supporting that they were capable of, at least in part, reproducing DP properties. Thus, LNGFR(+)THY-1(+) iMCs may provide material for HF bioengineering and drug screening for hair diseases.

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Identification of factors contributing to phenotypic divergence via quantitative image analyses of autosomal recessive woolly hair/hypotrichosis with homozygous c.736T>A LIPH mutation

Kinoshita-Ise M., Kubo A., Sasaki T., Umegaki-Arao N., Amagai M., Ohyama M.

British Journal of Dermatology 176 ( 1 ) 138 - 144 2017.01

ISSN 0007-0963

<p>Background: Autosomal recessive woolly hair/hypotrichosis (ARWH/H) is caused by mutations in LIPH. Homozygotes for the LIPH c.736T>A (p.C246S) mutation, the most prevalent genotype in Japanese patients, present varying degrees of hair loss; however, determinants of this phenotypic diversity remain elusive. Objectives: To establish methodologies for quantitative assessment of clinical severity and provide a detailed characterization to elucidate the factors contributing to phenotypic divergence. Methods: Digital image analyses were conducted to convert clinical severities into numerical values. Eight patients with ARWH/H were classified into three groups (mild, severe, very severe), based on severity scores. Dermoscopic images were collected and assessed for total hair numbers and hair thickness for intergroup comparisons. Results: The image analysis detected a difference in hair thickness but not in total hair numbers, between mild and severe cases. A marked decrease in total hair number was noted in an atypical very severe case. Histopathologically, a patient with a mild case demonstrated hair miniaturization and a high telogen/anagen ratio without a decrease in total hair count, endorsing dermoscopic observations. Two children demonstrated spontaneous improvement without an increase in total hair numbers, and two adults responded well to topical minoxidil with increased total hair numbers and hair thickness. Conclusions: The difference in the frequency of underdeveloped hairs may be a major factor contributing to the clinical diversity of hair sparseness in LIPH c.736T>A homozygotes with ARWH/H. Hence, pharmacological modification to thicken existing fine hairs may provide a therapeutic strategy.</p>

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Identification of factors contributing to phenotypic divergence via quantitative image analyses of autosomal recessive woolly hair/hypotrichosis with homozygous c.736T>A LIPH mutation

Kinoshita-Ise, M., Kubo, A., Sasaki, T., Umegaki-Arao, N., Amagai, M. and Ohyama, M.

Br J Dermatol 176 ( 1 ) 138 - 144 2017.01

ISSN 1365-2133

BACKGROUND: Autosomal recessive woolly hair/hypotrichosis (ARWH/H) is caused by mutations in LIPH. Homozygotes for the LIPH c.736T>A (p.C246S) mutation, the most prevalent genotype in Japanese patients, present varying degrees of hair loss; however, determinants of this phenotypic diversity remain elusive. OBJECTIVES: To establish methodologies for quantitative assessment of clinical severity and provide a detailed characterization to elucidate the factors contributing to phenotypic divergence. METHODS: Digital image analyses were conducted to convert clinical severities into numerical values. Eight patients with ARWH/H were classified into three groups (mild, severe, very severe), based on severity scores. Dermoscopic images were collected and assessed for total hair numbers and hair thickness for intergroup comparisons. RESULTS: The image analysis detected a difference in hair thickness but not in total hair numbers, between mild and severe cases. A marked decrease in total hair number was noted in an atypical very severe case. Histopathologically, a patient with a mild case demonstrated hair miniaturization and a high telogen/anagen ratio without a decrease in total hair count, endorsing dermoscopic observations. Two children demonstrated spontaneous improvement without an increase in total hair numbers, and two adults responded well to topical minoxidil with increased total hair numbers and hair thickness. CONCLUSIONS: The difference in the frequency of underdeveloped hairs may be a major factor contributing to the clinical diversity of hair sparseness in LIPH c.736T>A homozygotes with ARWH/H. Hence, pharmacological modification to thicken existing fine hairs may provide a therapeutic strategy.

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Case of dominant dystrophic epidermolysis bullosa with amniotic band syndrome

Sakiyama, T., Umegaki-Arao, N., Sasaki, T., Kosaki, K., Amagai, M. and Kubo, A.

J Dermatol 44 ( 1 ) 102 - 103 2017.01

ISSN 1346-8138

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Novel KRT9 missense mutation in a Japanese case of epidermolytic palmoplantar keratoderma

Fukunaga Yoshie, Kubo Akiharu, Sasaki Takashi, Tsuruta Daisuke, Fukai Kazuyoshi

Journal of Dermatology 2017

ISSN 0385-2407

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RNA Sequencing Analysis Reveals Interactions between Breast Cancer or Melanoma Cells and the Tissue Microenvironment during Brain Metastasis

Sato Ryo, Nakano Teppei, Hosonaga Mari, Sampetrean Oltea, Harigai Ritsuko, Sasaki Takashi, Koya Ikuko, Okano Hideyuki, Kudoh Jun, Saya Hideyuki, Arima Yoshimi

BioMed Research International 2017 2017

ISSN 2314-6133

<p>Metastasis is the main cause of treatment failure and death in cancer patients. Metastasis of tumor cells to the brain occurs frequently in individuals with breast cancer, non-small cell lung cancer, or melanoma. Despite recent advances in our understanding of the causes and in the treatment of primary tumors, the biological and molecular mechanisms underlying the metastasis of cancer cells to the brain have remained unclear. Metastasizing cancer cells interact with their microenvironment in the brain to establish metastases. We have now developed mouse models of brain metastasis based on intracardiac injection of human breast cancer or melanoma cell lines, and we have performed RNA sequencing analysis to identify genes in mouse brain tissue and the human cancer cells whose expression is associated specifically with metastasis. We found that the expressions of the mouse genes Tph2, Sspo, Ptprq, and Pole as well as those of the human genes CXCR4, PLLP, TNFSF4, VCAM1, SLC8A2, and SLC7A11 were upregulated in brain tissue harboring metastases. Further characterization of such genes that contribute to the establishment of brain metastases may provide a basis for the development of new therapeutic strategies and consequent improvement in the prognosis of cancer patients.</p>

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Identification and Characterization of a Recessive Missense Mutation p.P277L in SERPINB7 in Nagashima-Type Palmoplantar Keratosis

Shiohama, A., Sasaki, T., Sato, S., Sakabe, J., Ito, T., Isoda, H., Zenke, Y., Nakano, T., Maeda, T., Ishiko, A., Kabashima, K., Tokura, Y., Mitsuhashi, Y., Amagai, M. and Kubo, A.

J Invest Dermatol 136 ( 1 ) 325 - 8 2016.01

ISSN 1523-1747

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Japanese recurrent mutation c.6216+5G>T in COL7A1 leads to a mild phenotype of dystrophic epidermolysis bullosa

Masunaga, T., Saito, M., Sasaki, T., Kubo, A., Amagai, M. and Ishiko, A.

J Dermatol Sci 80 ( 3 ) 220 - 3 2015.12

ISSN 1873-569X

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Pathological characterization of pachydermia in pachydermoperiostosis

Tanese, K., Niizeki, H., Seki, A., Otsuka, A., Kabashima, K., Kosaki, K., Kuwahara, M., Miyakawa, S., Miyasaka, M., Matsuoka, K., Okuyama, T., Shiohama, A., Sasaki, T., Kudoh, J., Amagai, M. and Ishiko, A.

J Dermatol 42 ( 7 ) 710 - 4 2015.07

ISSN 1346-8138

Pachydermoperiostosis is a rare hereditary disease, which presents with the cutaneous manifestations of pachydermia and cutis verticis gyrata. Histological findings in pachydermia frequently include dermal edema, mucin deposition, elastic fiber degeneration, dermal fibrosis and adnexal hyperplasia. However, the severity of these findings varies between clinical reports, and a systematic multiple-case clinicopathological correlative analysis has not been performed to date. In the present study, we reviewed the skin biopsy specimens obtained from the pachydermia of six pachydermoperiostosis patients. The severity of the characteristic histological features was semiquantitatively evaluated and correlated with the grade of pachydermia. Dermal edema, mucin deposition and elastic fiber degeneration were observed in all cases. Patients with severe pachydermia had sebaceous gland hyperplasia and fibrosis. These results suggest that the triad of mucin deposition, dermal edema and elastic fiber degeneration are found from very early stage pachydermia, and could be considered diagnostic findings. To ensure an earlier diagnosis of pachydermoperiostosis, a biopsy should be taken when a patient has grade 1 pachydermia to determine the presence of this histological triad.

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YAP is essential for tissue tension to ensure vertebrate 3D body shape

Porazinski, S., Wang, H., Asaoka, Y., Behrndt, M., Miyamoto, T., Morita, H., Hata, S., Sasaki, T., Krens, S. F. G., Osada, Y., Asaka, S., Momoi, A., Linton, S., Miesfeld, J. B., Link, B. A., Senga, T., Shimizu, N., Nagase, H., Matsuura, S., Bagby, S., Kondoh, H., Nishina, H., Heisenberg, C. P. and Furutani-Seiki, M.

Nature 521 ( 7551 ) 217 - 221 2015.05

ISSN 1476-4687

Vertebrates have a unique 3D body shape in which correct tissue and organ shape and alignment are essential for function. For example, vision requires the lens to be centred in the eye cup which must in turn be correctly positioned in the head. Tissue morphogenesis depends on force generation, force transmission through the tissue, and response of tissues and extracellular matrix to force. Although a century ago D'Arcy Thompson postulated that terrestrial animal body shapes are conditioned by gravity, there has been no animal model directly demonstrating how the aforementioned mechano-morphogenetic processes are coordinated to generate a body shape that withstands gravity. Here we report a unique medaka fish (Oryzias latipes) mutant, hirame (hir), which is sensitive to deformation by gravity. hir embryos display a markedly flattened body caused by mutation of YAP, a nuclear executor of Hippo signalling that regulates organ size. We show that actomyosin-mediated tissue tension is reduced in hir embryos, leading to tissue flattening and tissue misalignment, both of which contribute to body flattening. By analysing YAP function in 3D spheroids of human cells, we identify the Rho GTPase activating protein ARHGAP18 as an effector of YAP in controlling tissue tension. Together, these findings reveal a previously unrecognised function of YAP in regulating tissue shape and alignment required for proper 3D body shape. Understanding this morphogenetic function of YAP could facilitate the use of embryonic stem cells to generate complex organs requiring correct alignment of multiple tissues.

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Long-term safety issues of iPSC-based cell therapy in a spinal cord injury model: oncogenic transformation with epithelial-mesenchymal transition

Nori, S., Okada, Y., Nishimura, S., Sasaki, T., Itakura, G., Kobayashi, Y., Renault-Mihara, F., Shimizu, A., Koya, I., Yoshida, R., Kudoh, J., Koike, M., Uchiyama, Y., Ikeda, E., Toyama, Y., Nakamura, M. and Okano, H.

Stem Cell Reports 4 ( 3 ) 360 - 73 2015.03

ISSN 2213-6711

Previously, we described the safety and therapeutic potential of neurospheres (NSs) derived from a human induced pluripotent stem cell (iPSC) clone, 201B7, in a spinal cord injury (SCI) mouse model. However, several safety issues concerning iPSC-based cell therapy remain unresolved. Here, we investigated another iPSC clone, 253G1, that we established by transducing OCT4, SOX2, and KLF4 into adult human dermal fibroblasts collected from the same donor who provided the 201B7 clone. The grafted 253G1-NSs survived, differentiated into three neural lineages, and promoted functional recovery accompanied by stimulated synapse formation 47 days after transplantation. However, long-term observation (for up to 103 days) revealed deteriorated motor function accompanied by tumor formation. The tumors consisted of Nestin(+) undifferentiated neural cells and exhibited activation of the OCT4 transgene. Transcriptome analysis revealed that a heightened mesenchymal transition may have contributed to the progression of tumors derived from grafted cells.

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Case of non-Herlitz junctional epidermolysis bullosa with COL17A1 mutation

Kasai, H., Sasaki, T., Matsuzaki, H., Yoshioka, T., Nagao, K., Amagai, M., Ishiko, A. and Kubo, A.

J Dermatol 42 ( 3 ) 323 - 5 2015.03

ISSN 1346-8138

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Global gene expression analysis following spinal cord injury in non-human primates

Nishimura, S., Sasaki, T., Shimizu, A., Yoshida, K., Iwai, H., Koya, I., Kobayashi, Y., Itakura, G., Shibata, S., Ebise, H., Horiuchi, K., Kudoh, J., Toyama, Y., Anderson, A. J., Okano, H. and Nakamura, M.

Exp Neurol 261 171 - 9 2014.11

ISSN 1090-2430

Spinal cord injury (SCI) is a devastating condition with no established treatment. To better understand the pathology and develop a treatment modality for SCI, an understanding of the physiological changes following SCI at the molecular level is essential. However, studies on SCI have primarily used rodent models, and few studies have examined SCI in non-human primates. In this study, we analyzed the temporal changes in gene expression patterns following SCI in common marmosets (Callithrix jacchus) using microarray analysis and mRNA deep sequencing. This analysis revealed that, although the sequence of events is comparable between primates and rodents, the inflammatory response following SCI is significantly prolonged and the onset of glial scar formation is temporally delayed in primates compared with rodents. These observations indicate that the optimal time window to treat SCI significantly differs among different species. This study provides the first extensive analysis of gene expression following SCI in non-human primates and will serve as a valuable resource in understanding the pathology of SCI.

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Application of moisturizer to neonates prevents development of atopic dermatitis

Horimukai, K., Morita, K., Narita, M., Kondo, M., Kitazawa, H., Nozaki, M., Shigematsu, Y., Yoshida, K., Niizeki, H., Motomura, K., Sago, H., Takimoto, T., Inoue, E., Kamemura, N., Kido, H., Hisatsune, J., Sugai, M., Murota, H., Katayama, I., Sasaki, T., Amagai, M., Morita, H., Matsuda, A., Matsumoto, K., Saito, H. and Ohya, Y.

J Allergy Clin Immunol 134 ( 4 ) 824 - 830 e6 2014.10

ISSN 1097-6825

BACKGROUND: Recent studies have suggested that epidermal barrier dysfunction contributes to the development of atopic dermatitis (AD) and other allergic diseases. OBJECTIVE: We performed a prospective, randomized controlled trial to investigate whether protecting the skin barrier with a moisturizer during the neonatal period prevents development of AD and allergic sensitization. METHODS: An emulsion-type moisturizer was applied daily during the first 32 weeks of life to 59 of 118 neonates at high risk for AD (based on having a parent or sibling with AD) who were enrolled in this study. The onset of AD (eczematous symptoms lasting >4 weeks) and eczema (lasting >2 weeks) was assessed by a dermatology specialist on the basis of the modified Hanifin and Rajka criteria. The primary outcome was the cumulative incidence of AD plus eczema (AD/eczema) at week 32 of life. A secondary outcome, allergic sensitization, was evaluated based on serum levels of allergen-specific IgE determined by using a high-sensitivity allergen microarray of diamond-like carbon-coated chips. RESULTS: Approximately 32% fewer neonates who received the moisturizer had AD/eczema by week 32 than control subjects (P = .012, log-rank test). We did not show a statistically significant effect of emollient on allergic sensitization based on the level of IgE antibody against egg white at 0.34 kUA/L CAP-FEIA equivalents. However, the sensitization rate was significantly higher in infants who had AD/eczema than in those who did not (odds ratio, 2.86; 95% CI, 1.22-6.73). CONCLUSION: Daily application of moisturizer during the first 32 weeks of life reduces the risk of AD/eczema in infants. Allergic sensitization during this time period is associated with the presence of eczematous skin but not with moisturizer use.

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Filaggrin loss-of-function mutations are not a predisposing factor for atopic dermatitis in an Ishigaki Island under subtropical climate

Sasaki, T., Furusyo, N., Shiohama, A., Takeuchi, S., Nakahara, T., Uchi, H., Hirota, T., Tamari, M., Shimizu, N., Ebihara, T., Amagai, M., Furue, M., Hayashi, J. and Kudoh, J.

J Dermatol Sci 76 ( 1 ) 10 - 5 2014.10

ISSN 1873-569X

BACKGROUND: Filaggrin (FLG) is a major protein component of the stratum corneum (SC) layer, and FLG loss-of-function mutations are a predisposing factor for atopic dermatitis (AD). Previous cohort studies of children from northern and western Europe have reported FLG loss-of-function mutation frequencies of 15.1-20.9% and 5.8-13.0% in AD and non-AD groups, respectively. OBJECTIVE: To elucidate the association between AD prevalence of FLG loss-of-function mutation carriers and climate conditions, we determined the AD prevalence and FLG loss-of-function mutation frequencies in a cohort of children from Ishigaki Island. Ishigaki Island has a subtropical climate with high humidity (monthly average, 60.8-78.7%) and high temperature (monthly average, 18.5-29.4 degrees C) throughout the year. METHODS: We diagnosed AD prevalence and analyzed eight FLG loss-of-function mutations in the Japanese population against a cohort of 721 children from the Kyushu University Ishigaki Atopic Dermatitis Study (KIDS) cohort. Parents gave consent for the mutation analysis during their medical examinations from 2001 to 2006. RESULTS: Average AD prevalence was 7.3% per year, and a total of 127 children (17.6%) were diagnosed with AD at least once between 2001 and 2006. The average total serum IgE level differed significantly between the AD and non-AD groups (199.0 and 69.0IU/ml, respectively). Although five kinds of FLG loss-of-function mutations isolated in previous Japanese FLG mutation studies were identified, the FLG loss-of-function mutation frequency in children of the KIDS cohort was not significantly different between the AD and non-AD groups (7.9% and 6.1%, respectively; P=0.174). CONCLUSION: The FLG loss-of-function mutation frequency was not significantly different between the AD and non-AD groups in a cohort of children from Ishigaki Island, which has a subtropical climate, suggesting that FLG loss-of-function mutations are not always a predisposing factor for AD prevalence.

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The complete type of pachydermoperiostosis: a novel nonsense mutation p.E141* of the SLCO2A1 gene

Niizeki, H., Shiohama, A., Sasaki, T., Seki, A., Kabashima, K., Otsuka, A., Kosaki, K., Ogo, A., Yamada, T., Miyasaka, M., Matsuoka, K., Hirakiyama, A., Okuyama, T., Matsuda, M., Nakabayashi, K., Tanese, K., Ishiko, A., Amagai, M. and Kudoh, J.

J Dermatol Sci 75 ( 3 ) 193 - 5 2014.09

ISSN 1873-569X

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The novel SLCO2A1 heterozygous missense mutation p.E427K and nonsense mutation p.R603* in a female patient with pachydermoperiostosis with an atypical phenotype

Niizeki, H., Shiohama, A., Sasaki, T., Seki, A., Kabashima, K., Otsuka, A., Takeshita, M., Hirakiyama, A., Okuyama, T., Tanese, K., Ishiko, A., Amagai, M. and Kudoh, J.

Br J Dermatol 170 ( 5 ) 1187 - 9 2014.05

ISSN 1365-2133

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[Mouse models for spontaneous dermatitis due to impaired skin barrier formation]

Sasaki, T., Shiohama, A. and Amagai, M.

Nihon Rinsho Meneki Gakkai Kaishi 37 ( 3 ) 160 - 5 2014

ISSN 1349-7413

Flaky tail mice possess two distinct autosomal recessive mutations, hair abnormality (matted: ma) and stratum corneum layer abnormality (flaky tail: ft), and develop dermatitis spontaneously with high serum IgE even under specific pathogen free condition. We demonstrated that flaky tail mice possess loss of function mutation in Filaggrin (Flg) which is one of the major component of stratum corneum, and showed skin barrier abnormality, although our genetically engineered Flg null mice did not develop dermatitis spontaneously. As a result of segregation of ft and ma mutations, we identified that ma mutation is responsible for the dermatitis phenotype in flaky tail mice, and Tmem79 nonsense mutation (Tmem79(ma)) is corresponding to the ma mutation. Tmem79 is expressed in outermost cell of stratum granulosum layer, and ma mice showed abnormal lamellar granule secretory system and abnormal formation of stratum corneum. Thus, Tmem79(ma/ma) mice provides a useful mouse model for spontaneous dermatitis caused by skin barrier gene deficiency. Further analysis for Tmem79(ma/ma) mice would elucidate important mechanisms for development of atopic dermatitis.

フィラグリン(fillagrin)

雅行, 佐々木　貴史、天谷

分子消化器病 11(2) 88 - 93 2014

皮膚バリア異常を示す自然発症皮膚炎モデルマウス

雅行, 佐々木　貴史、塩濱　愛子、天谷

日本臨床免疫学会会誌 37(3) 160 - 165 2014

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