著者

Hidenori Ando Sherif E. Emam Yoshino Kawaguchi Taro Shimizu Yu Ishima Kiyoshi Eshima Tatsuhiro Ishida

出版者

The Pharmaceutical Society of Japan

雑誌

Biological and Pharmaceutical Bulletin (ISSN:09186158)

巻号頁・発行日

vol.44, no.6, pp.844-852, 2021-06-01 (Released:2021-06-01)

参考文献数

45

被引用文献数

10

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Acidic extracellular pH (pHe) is characteristic of the tumor microenvironment. Several reports suggest that increasing pHe improves the response of immune checkpoint inhibitors in murine models. To increase pHe, either sodium bicarbonate (NaHCO3) or citric acid/potassium-sodium citrate (KNa-cit) was chronically administered to mice. It is hypothesized that bicarbonate ions (HCO3−), produced from these alkalinizing agents in vivo, increased pHe in the tumor, and excess HCO3− eliminated into urine increased urinary pH values. However, there is little published information on the effect of changing serum HCO3− concentrations, urinary HCO3− concentrations and urinary pH values on the therapeutic outcomes of immunotherapy. In this study, we report that oral administration of either NaHCO3 or KNa-cit increased responses to anti-programmed cell death-1 (PD-1) antibody, an immune checkpoint inhibitor, in a murine B16 melanoma model. In addition, we report that daily oral administration of an alkalinizing agent increased blood HCO3− concentrations, corresponding to increasing the tumor pHe. Serum HCO3− concentrations also correlated with urinary HCO3− concentrations and urinary pH values. There was a clear relationship between urinary pH values and the antitumor effects of immunotherapy with anti-PD-1 antibody. Our results imply that blood HCO3− concentrations, corresponding to tumor pHe and urinary pH values, may be important factors that predict the clinical outcomes of an immunotherapeutic agent, when combined with alkalinizing agents such as NaHCO3 and KNa-cit.

著者

Masayuki Amano Taro Shimizu

出版者

一般社団法人 日本内科学会

雑誌

Internal Medicine (ISSN:09182918)

巻号頁・発行日

vol.53, no.2, pp.79-82, 2014 (Released:2014-01-15)

参考文献数

21

被引用文献数

14 95

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Emphysematous cystitis (EC) is a rare form of complicated urinary tract infection, its characteristic feature being gas within the bladder wall and lumen. Patients with EC present with variable clinical manifestations ranging from asymptomatic to severe sepsis. EC is typically observed in elderly women with severe diabetes mellitus. Escherichia coli and Klebsiella pneumoniae are often isolated from urine cultures. Imaging methods, such as plain conventional abdominal radiography and computed tomography, are pivotal for obtaining a definitive diagnosis of EC. Most cases can be treated with a combination of antibiotics, bladder drainage and glycemic control. EC is potentially life-threatening, with a mortality rate of 7%. Early medical intervention can contribute to achieving a favorable prognosis without the need for surgical intervention. In this review, we provide a comprehensive description of the clinical characteristics of EC.

著者

Masayuki Amano Taro Shimizu

出版者

The Japanese Society of Internal Medicine

雑誌

Internal Medicine (ISSN:09182918)

巻号頁・発行日

pp.0495-17, (Released:2018-05-18)

参考文献数

57

被引用文献数

67

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Mondor's disease (MD) is a rare disease that manifests with a palpable cord-like induration on the body surface. In general, MD is a self-limited, benign thrombophlebitis that resolves in four to eight weeks without any specific treatment. Cases of MD can be roughly categorized into three different groups based on the site of the lesion as follows: original MD of the anterolateral thoracoabdominal wall, penile MD with dorsum and dorsolateral aspects of the penis, and axillary web syndrome with mid-upper arm after axillary surgery. The diagnosis of MD is rather straightforward and based on a physical examinations. However, some case occur "secondary" with another underlying disease, including malignancy, a hypercoagulative state, and vasculitis. Therefore, it is critical to identify MD precisely, evaluate any possible underlying disease, and avoid any unnecessary invasive tests or treatment. In this paper, we comprehensively review the clinical characteristics of MD.

著者

Taku Harada Takanobu Hirosawa Kouhei Morinaga Taro Shimizu

出版者

一般社団法人 日本内科学会

雑誌

Internal Medicine (ISSN:09182918)

巻号頁・発行日

vol.56, no.6, pp.737-739, 2017-03-15 (Released:2017-03-17)

参考文献数

10

被引用文献数

11

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A 40-year-old woman with bipolar disorder who was taking mirtazapine presented with mydriasis, abnormal diaphoresis, myoclonus and muscle rigidity after taking metocloplamide. Her medical history, which included the use of serotonergic agents, and the presence of symptoms including myoclonus and muscle rigidity were consistent with a diagnosis of serotonin syndrome (SS) according to the Hunter criteria. The symptoms diminished following three days of treatment with oral lorazepam and cyproheptadine and a reduced dose of mirtazapine. Metoclopramide is frequently used to various gastric symptom. Metoclopramide is not widely known to induce SS. This potentially fatal condition should be avoided by exercising care in the use of drugs that have the potential to cause drug-drug interactions.

著者

Taro Shimizu Yoshino Kawaguchi Hidenori Ando Yu Ishima Tatsuhiro Ishida

出版者

The Pharmaceutical Society of Japan

雑誌

Chemical and Pharmaceutical Bulletin (ISSN:00092363)

巻号頁・発行日

vol.70, no.5, pp.341-350, 2022-05-01 (Released:2022-05-01)

参考文献数

110

被引用文献数

2

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Vaccines have contributed to the prevention of infectious diseases for a long time. Pathogen-derived antigens and adjuvants in vaccine formulations stimulate immune cells to elicit humoral and cellular immune responses against pathogens. Achieving highly immune responses with decreased adverse effects requires the development of a system that can deliver antigens to specific immune cells. Dendritic cells (DCs) are well-known professional antigen presenting cells (APCs) that initiate acquired immune responses by presenting antigens to T cells. Accordingly, DC-targeted vaccines have been investigated and applied in clinical trials for the treatment of infectious diseases and for chronic diseases such as cancers. In addition to DCs, B lymphocytes are regarded as professional APCs despite their primary role in humoral immunity. Therefore, B cell-targeted vaccines are also expected to elicit both humoral and cellular immune responses. In this review we summarize the basic functions of DCs and B cells as APCs. We also provide information on DC and B cell targeted vaccines in preclinical and clinical settings. Finally, we introduce our novel antigen delivery system that targets splenic marginal zone B cells and the ability of this system to act as a novel vaccine that elicits both humoral and cellular immune responses.

著者

Taku Harada Yukinori Harada Taro Shimizu

出版者

The Japanese Society of Internal Medicine

雑誌

Internal Medicine (ISSN:09182918)

巻号頁・発行日

pp.6736-20, (Released:2021-03-22)

参考文献数

13

被引用文献数

3

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Exposure to quinolones is known to be an independent risk factor for aortic dissection; however, the association with vertebral artery dissection remains unclear. We report two cases of vertebral artery dissection that occurred 4 and 8 days after exposure to levofloxacin, respectively. Both patients had risk factors for vertebral artery dissection, and quinolone use could have been avoided. These two cases indicate that quinolone exposure can be a risk factor for vertebral artery dissection. Considering the possible mechanism, it is better to avoid the prescription of quinolones to patients who have insufficient connective tissues to avoid vertebral artery dissection.

著者

Masayuki Amano Taro Shimizu

出版者

The Japanese Society of Internal Medicine

雑誌

Internal Medicine (ISSN:09182918)

巻号頁・発行日

vol.57, no.18, pp.2607-2612, 2018-09-15 (Released:2018-09-15)

参考文献数

56

被引用文献数

67

---

Mondor's disease (MD) is a rare disease that manifests with a palpable cord-like induration on the body surface. In general, MD is a self-limited, benign thrombophlebitis that resolves in four to eight weeks without any specific treatment. Cases of MD can be roughly categorized into three different groups based on the site of the lesion as follows: original MD of the anterolateral thoracoabdominal wall, penile MD with dorsum and dorsolateral aspects of the penis, and axillary web syndrome with mid-upper arm after axillary surgery. The diagnosis of MD is rather straightforward and based on a physical examinations. However, some case occur "secondary" with another underlying disease, including malignancy, a hypercoagulative state, and vasculitis. Therefore, it is critical to identify MD precisely, evaluate any possible underlying disease, and avoid any unnecessary invasive tests or treatment. In this paper, we comprehensively review the clinical characteristics of MD.

著者

Masayuki Amano Taro Shimizu

出版者

日本プライマリ・ケア連合学会

雑誌

General Medicine (ISSN:13460072)

巻号頁・発行日

vol.16, no.2, pp.63-67, 2015-06-20 (Released:2015-06-22)

参考文献数

11

著者

Taro Shimizu Yasuharu Tokuda

出版者

一般社団法人 日本内科学会

雑誌

Internal Medicine (ISSN:09182918)

巻号頁・発行日

vol.49, no.12, pp.1051-1057, 2010 (Released:2010-06-15)

参考文献数

80

被引用文献数

30 91

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Necrotizing fasciitis (NF) is a necrotizing soft tissue infection that can cause rapid local tissue destruction, necrosis and life-threatening severe sepsis. Predisposing conditions for NF include diabetes, malignancy, alcohol abuse, and chronic liver and kidney diseases. NF is classified into two categories (types 1 and 2) based on causative microorganisms. The initial clinical picture of NF mimics that of cellulitis or erysipelas, including fever, pain, tenderness, swelling and erythema. The cardinal manifestations of NF are severe pain at onset out of proportion to local findings, hemorrhagic bullae and/or vital sign abnormality. In such cases, NF should be strongly suspected and immediate surgical intervention should be considered, along with broad-spectrum antimicrobials and general supportive measures, regardless of the findings of imaging tests.