Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Kohei Horioka Last modified date:2024.06.03

Assistant Professor / Gastrointestinal Surgery (1) / Kyushu University Hospital

1. Chikanori Tsutsumi, Kenoki Ohuchida, Naoki Katayama, Yutaka Yamada, Shoichi Nakamura, Sho Okuda, Yoshiki Otsubo, Chika Iwamoto, Nobuhiro Torata, Kohei Horioka, Koji Shindo, Yusuke Mizuuchi, Naoki Ikenaga, Kohei Nakata, Eishi Nagai, Takashi Morisaki, Yoshinao Oda, Masafumi Nakamura, Tumor-infiltrating monocytic myeloid-derived suppressor cells contribute to the development of an immunosuppressive tumor microenvironment in gastric cancer, Gastric Cancer, 10.1007/s10120-023-01456-4, 2024.04, Background
Gastric cancer (GC) is characterized by an immunosuppressive and treatment-resistant tumor immune microenvironment (TIME). Here, we investigated the roles of different immunosuppressive cell types in the development of the GC TIME.
Single-cell RNA sequencing (scRNA-seq) and multiplex immunostaining of samples from untreated or immune checkpoint inhibitor (ICI)-resistant GC patients were used to examine the correlation between certain immunosuppressive cells and the prognosis of GC patients.
The results of the scRNA-seq analysis revealed that tumor-infiltrating monocytic myeloid-derived suppressor cells (TI-M-MDSCs) expressed higher levels of genes with immunosuppressive functions than other immunosuppressive cell types. Additionally, among the immunosuppressive cell types assessed, M-MDSCs were most significantly enriched in GC tissues relative to adjacent normal tissues. The M-MDSCs in GC tissues expressed significantly higher levels of these markers than adjacent normal tissues; moreover, their presence was most strongly associated with a poor prognosis among the immunosuppressive cells. Immediate early response 3 (IER3), which we identified as a differentially expressed gene between M-MDSCs of GC and adjacent normal tissues, was an independent poor prognostic factor in GC patients (P=0.0003). IER3+ M-MDSCs expressed higher levels of genes with immunosuppressive functions than IER3- M-MDSCs and were more abundant in treatment-resistant than -responsive GC patie
The present study suggests that TI-M-MDSCs, especially IER3+ ones, may play a predominant role in the development of the immunosuppressive and ICI-resistant GC TIME.
2. Fujiwara K, Ohuchida K, Sada M, Horioka K, Ulrich CD 3rd, Shindo K, Ohtsuka T, Takahata S, Mizumoto K, Oda Y, Tanaka M, CD166/ALCAM expression is characteristic of tumorigenicity and invasive and migratory activities of pancreatic cancer cells, PLoS One, 9, 9, e107247, 2014.04, BACKGROUND:

CD166, also known as activated leukocyte cell adhesion molecule (ALCAM), is expressed by various cells in several tissues including cancer. However, the role of CD166 in malignant tumors is controversial, especially in pancreatic cancer. This study aimed to clarify the role and significance of CD166 expression in pancreatic cancer.


We performed immunohistochemistry and flow cytometry to analyze the expression of CD166 in surgical pancreatic tissues and pancreatic cancer cell lines. The differences between isolated CD166+ and CD166- pancreatic cancer cells were analyzed by invasion and migration assays, and in mouse xenograft models. We also performed quantitative RT-PCR and microarray analyses to evaluate the expression levels of CD166 and related genes in cultured cells.


Immunohistochemistry revealed high expression of CD166 in pancreatic cancer tissues (12.2%; 12/98) compared with that in normal pancreas controls (0%; 0/17) (p = 0.0435). Flow cytometry indicated that CD166 was expressed in 33.8-70.2% of cells in surgical pancreatic tissues and 0-99.5% of pancreatic cancer cell lines. Invasion and migration assays demonstrated that CD166- pancreatic cancer cells showed stronger invasive and migratory activities than those of CD166+ cancer cells (p

CD166+ pancreatic cancer cells are strongly tumorigenic, while CD166- pancreatic cancer cells exhibit comparatively stronger invasive and migratory activities. These findings suggest that CD166 expression is related to different functions in pancreatic cancer cells.
3. Horioka K, Ohuchida K, Sada M, Zheng B, Moriyama T, Fujita H, Manabe T, Ohtsuka T, Shimamoto M, Miyazaki T, Mizumoto K, Oda Y, Nakamura M, Suppression of CD51 in pancreatic stellate cells inhibits tumor growth by reducing stroma and altering tumor-stromal interaction in pancreatic cancer, Int J Oncol, 48, 4, 1499-1508, 2016.04, Pancreatic stellate cells (PSCs) enhance the malignant behavior of pancreatic cancer by interacting with cancer cells and producing extracellular matrix (ECM). To date, several stroma-targeted therapies for pancreatic cancer have been attempted, but these therapies are still not in practical use. Integrins expressed in stromal cells are involved in fibrosis of several organs, as well as promoting tumor malignancy. We investigated whether CD51, also known as integrin αV, expressed in PSCs was associated with stromal formation of pancreatic cancer and enhancement of tumor malignancy. We also assessed the effects of suppression of CD51 in PSCs on pancreatic cancer. Immunohistochemistry for CD51 in resected pancreatic cancer tissues showed that high expression of CD51 in the tumor stroma was associated with lymph node metastasis (P=0.025), positive pathologic margin (P=0.025), and shorter patient survival times (P=0.043). Lentivirus-mediated short hairpin RNA knockdown of CD51 decreased the proliferation and migration of PSCs. Quantitative real-time polymerase chain reaction showed that expression levels of genes related with ECM and tumor-stromal interactions were decreased by CD51 knockdown in PSCs. In a co-implantation model of pancreatic cancer cells and PSCs, tumor growth in vivo was inhibited by CD51 knockdown in PSCs (P
4. Sada M, Ohuchida K, Horioka K, Okumura T, Moriyama T, Miyasaka Y, Ohtsuka T, Mizumoto K, Oda Y, Nakamura M, Hypoxic stellate cells of pancreatic cancer stroma regulate extracellular matrix fiber organization and cancer cell motility, Cancer Lett, 10.1016/j.canlet.2016.01., 372, 2, 210-218, 2016.04, Desmoplasia and hypoxia in pancreatic cancer mutually affect each other and create a tumor-supportive microenvironment. Here, we show that microenvironment remodeling by hypoxic pancreatic stellate cells (PSCs) promotes cancer cell motility through alteration of extracellular matrix (ECM) fiber architecture. Three-dimensional (3-D) matrices derived from PSCs under hypoxia exhibited highly organized parallel-patterned matrix fibers compared with 3-D matrices derived from PSCs under normoxia, and promoted cancer cell motility by inducing directional migration of cancer cells due to the parallel fiber architecture. Microarray analysis revealed that procollagen-lysine, 2-oxoglutarate 5-dioxygenase 2 (PLOD2) in PSCs was the gene that potentially regulates ECM fiber architecture under hypoxia. Stromal PLOD2 expression in surgical specimens of pancreatic cancer was confirmed by immunohistochemistry. RNA interference-mediated knockdown of PLOD2 in PSCs abrogated para
llel fiber architecture of 3-D matrices, leading to decreased directional migration of cancer cells within the matrices. In conclusion, these findings indicate that hypoxia-induced PLOD2 in PSCs creates a permissive microenvironment for migration of cancer cells through architectural regulation of stromal ECM in pancreatic cancer..
5. Zheng B, Ohuchida K, Chijiiwa Y, Zhao M, Mizuuchi Y, Cui L, Horioka K, Ohtsuka T, Mizumoto K, Oda Y, Hashizume M, Nakamura M, Tanaka M, CD146 Attenuation in Cancer-Associated Fibroblasts Promotes Pancreatic Cancer Progression, Mol Carcinog, 10.1002/mc.22409, 55, 11, 1560-1572, 2016.04.
6. Abe T, Ohuchida K, Koikawa K, Endo S, Okumura T, Sada M, Horioka K, Zheng B, Moriyama T, Nakata K, Miyasaka Y, Manabe T, Ohtsuka T, Nagai E, Mizumoto K, Hashizume M, Nakamura M, Cancer-associated peritoneal mesothelial cells lead the formation of pancreatic cancer peritoneal dissemination, Int J Oncol, 50, 2, 457-467, 2017.04, The interaction between the cancer cells and the peritoneal mesothelial cells (PMCs) plays an important role in the peritoneal dissemination in several types of cancer. However, the role of PMCs in the peritoneal dissemination of pancreatic cancer remains unclear. In the present study, we investigated the interaction between the pancreatic cancer cells (PCCs) and the PMCs in the formation of peritoneal dissemination in vitro and in vivo. The tumor-stromal interaction of PCCs and PMCs significantly enhanced their mobility and invasiveness and enhanced the proliferation and anoikis resistance of PCCs. In a 3D organotypic culture model of peritoneal dissemination, co-culture of PCCs and PMCs significantly increased the cells invading into the collagen gel layer compared with mono-culture of PCCs. PMCs pre-invaded into the collagen gel, remodeled collagen fibers, and increased parallel fiber orientation along the direction of cell invasion. In the tissues
of peritoneal dissemination of the KPC (LSL-KrasG12D/+; LSL-Trp53R172H/+;Pdx-1-Cre) transgenic mouse, the monolayer of PMCs was preserved in tumor-free areas, whereas PMCs around the invasive front of peritoneal dissemination proliferated and invaded into the muscle layer. In vivo, intraperitoneal injection of PCCs with PMCs significantly promoted peritoneal dissemination compared with PCCs alone. The present data suggest that the cancer-associated PMCs have important promoting roles in the peritoneal dissemination of PCCs. Therapy targeting cancer-associated PMCs may improve the prognosis of patients with pancreatic cancer..
7. Endo S, Nakata K, Ohuchida K, Takesue S, Nakayama H, Abe T, Koikawa K, Okumura T, Sada M, Horioka K, Zheng B, Mizuuchi Y, Iwamoto C, Murata M, Moriyama T, Miyasaka Y, Ohtsuka T, Mizumoto K, Oda Y, Hashizume M, Nakamura M, Autophagy Is Required for Activation of Pancreatic Stellate Cells, Associated With Pancreatic Cancer Progression and Promotes Growth of Pancreatic Tumors in Mice, Gastroenterology, 10.1053/j.gastro.2017.01.010, 152, 6, 1492-1506, 2017.04, BACKGROUND & AIMS: Pancreatic stellate cells (PSCs) changefrom a quiescent to activated state in the tumor environmentand secrete extracellular matrix (ECM) molecules and cytokinesto increase the aggressiveness of tumors. However, it is notclear how PSCs are activated to produce these factors, orwhether this process can be inhibited. PSCs have morphologicand functional similarities to hepatic stellate cells, whichundergo autophagy to promote fibrosis and tumor growth. Weinvestigated whether autophagy activates PSCs, which promotesdevelopment of the tumor stroma and growth ofpancreatic tumors in mice. METHODS: We used immunofluorescencemicroscopy and immunohistochemistry to analyzepancreatic tumor specimens from 133 patients who underwentpancreatectomy in Japan from 2000 to 2009. PSCs werecultured from pancreatic tumor tissues or tissues of patientswith chronic pancreatitis; these were analyzed by immunofluorescencemicroscopy, immunoblots, quantitative
reversetranscription polymerase chain reaction, and in assays forinvasiveness, proliferation, and lipid droplets. Autophagy wasinhibited in PSCs by administration of chloroquine or transfectionwith small interfering RNAs. Proteins were knockeddown in immortalized PSCs by expression of small hairpinRNAs. Cells were transplanted into pancreatic tails of nudemice, and tumor growth and metastasis were quantified. RESULTS:Based on immunohistochemical analyses, autophagywas significantly associated with tumor T category (P シ .018),histologic grade (P シ .001), lymph node metastases (P < .001),stage (P シ .009), perilymphatic invasion (P シ .001), and perivascularinvasion (P シ .003). Autophagy of PSCs was associatedwith shorter survival times of patients with pancreatic cancer.PSC expression of microtubule-associated protein 1 lightchain 3, a marker of autophagosomes, was associated with pooroutcomes (shorter survival time, disease recurrence) forpati
ents with pancreatic cancer (relative risk of shorter survivaltime, 1.56). Immunoblots showed that PSCs from pancreatictumor samples expressed higher levels of markers of autophagythan PSCs from chronic pancreatitis samples. Inhibitorsof autophagy increased the number of lipid droplets of PSCs,indicating a quiescent state of PSCs, and reduced their productionof ECM molecules and interleukin 6, as well as theirproliferation and invasiveness in culture. PSCs exposedto autophagy inhibitors formed smaller tumors in nude mice(P シ .001) and fewer liver metastases (P シ .018) with lessperitoneal dissemination (P シ .018) compared to PSCs notexposed to autophagy inhibitors. CONCLUSIONS: AutophagicPSCs produce ECM molecules and interleukin 6 and areassociated with shorter survival times and disease recurrencein patients with pancreatic cancer. Inhibitors of PSC autophagymight reduce pancreatic tumor invasiveness by altering thetumor stroma..
8. Okumura T, Ohuchida K, Kibe S, Iwamoto C, Ando Y, Takesue S, Nakayama H, Abe T, Endo S, Koikawa K, Sada M, Horioka K, Mochidome N, Arita M, Moriyama T, Nakata K, Miyasaka Y, Ohtsuka T, Mizumoto K, Oda Y, Hashizume M, Nakamura M, Adipose tissue-derived stromal cells are sources of cancer-associated fibroblasts and enhance tumor progression by dense collagen matrix, Int J Cancer, 10.1002/ijc.31775 , 144, 6, 1401-1413, 2018.04, Abstract
Although recent studies revealed that adipose tissue accelerates pancreatic tumor progression with excessive extracellular matrix, key players for desmoplasia in the adipose microenvironment remains unknown. Here, we investigated the roles of adipose tissue-derived stromal cells (ASCs) in desmoplastic lesions and tumor progression by in vitro and in vivo experiments. In a three-dimensional (3-D) organotypic fat invasion model using visceral fat from CAG-EGFP mice, GFP-positive fibroblastic cells infiltrated toward cancer cells. When tumor cells were inoculated into transplanted visceral fat pads in vivo, tumor weights and stromal components were enhanced compared to subcutaneous and orthotopic tumor cells inoculated without fat pads. Expression of αSMA in established human ASCs was lower compared to cancer associated fibroblasts, and the 3-D collagen matrices produced by ASCs cultured in cancer cell-conditioned medium changed from loose to dense structures that affected the motility of cancer cells. Microarray analyses revealed upregulation of S100A4 in ASCs, while S100A4-positive stromal cells were observed at extrapancreatic invasion sites of human pancreatic cancer. The present findings indicate that ASCs are recruited to extrapancreatic invasion sites and produce dense collagen matrices that lead to enhanced tumor progression. Both inhibition of ASCs recruitment and activation could lead to a novel antistromal therapy.