Manpei Kawakami

Osaka Medical College, Takatuki, Ōsaka, Japan

Are you Manpei Kawakami?

Claim your profile

Publications (24)10.71 Total impact

  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Ciliary beat frequency (CBF) was measured by video-optical microscopy in rat tracheal and distal airway ciliary cells using a slice preparation. In tracheal ciliary cells (tracheal slice), ATP or 2-methylthio ATP (MeSATP) increased CBF, which was inhibited by suramin (100 microm, an inhibitor of purinergic receptor). Ionomycin (5 microm) or thapsigargin (2 microm) increased CBF similarly. Ca2+-free solution or addition of Ni2+ (1 mm) decreased CBF gradually by approximately 25% and subsequent stimulation with ATP (10 microm) increased CBF transiently. The purinergic agonist experiments demonstrated that ATP increases CBF in tracheal ciliary cells via both P2X and P2Y receptors. ATP increased the intracellular calcium concentration ([Ca2+]i) in tracheal ciliary cells. However, in distal airway ciliary cells (lung slice), ATP did not increase CBF and [Ca2+]i, although a Ca2+-free solution decreased CBF, and ionomycin (5 microm) or thapsigargin (2 microm) increased it. Moreover, acetylcholine (100 microm) did not increase CBF in distal airway ciliary cells, although it increased CBF in tracheal ciliary cells. Terbutaline (10 microm), a selective beta2-adrenergic agonist, increased CBF in both tracheal and distal airway ciliary cells. These observations suggest that the Ca2+-mobilization mechanisms via purinergic or muscarinic receptors of the distal airway ciliary cell may be different from those of the tracheal ciliary cell. In conclusion, the CBF increase is differently regulated in the tracheal and distal airway epithelia of the rat.
    Experimental Physiology 08/2005; 90(4):535-44. DOI:10.1113/expphysiol.2004.028746 · 2.67 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: A 32-year-old man was referred to our hospital because of a mediastinal tumor with mild dysphagia. Computed tomography (CT) showed that the tumor was located in the neck and the posterior mediastinum. An esophagogram demonstrated severe distortion of the esophageal lumen and an endoscopic examination disclosed a submucosal bulge covered by normal mucosa with no erosion and no ulceration. A CT-guided needle biopsy for neck lesion of the tumor was performed and the histopathological diagnosis was an esophageal leiomyoma. Complete enucleation via a left anteroaxillary thoracotomy for the tumor was performed without perforation of esophageal mucosa. The resected tumor was 12 cm in size. The final diagnosis of the resected tumor located in the cervical, upper, middle and intramural esophagus was a rare giant esophageal leiomyoma. Postoperative course was uneventful. We suggested that enucleation with an operative procedure selected carefully for a giant esophageal leiomyoma was attempted for preservation of esophageal function.
    Kyobu geka. The Japanese journal of thoracic surgery 01/2005; 57(13):1245-9.
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The ciliary beat frequency (CBF) of rat tracheal ciliary cells in a slice preparation was measured using video-enhanced contrast (VEC) microscopy. Acetylcholine (ACh) increased CBF mediated via intracellular Ca2+ concentration ([Ca2+]i) in a dose-dependent manner. An adequate hypo-osmotic stress (-40 mosM) potentiated ACh-stimulated CBF increase in tracheal ciliary cells and shifted the ACh dose-response curve to the left (lower concentration side). This potentiation was independent of hypo-osmotic stresses applied ranging from -20 mosM to -90 mosM. A hypo-osmotic stress induces ATP release in many cell types. The present study demonstrated that suramin (an inhibitor of purinergic receptors) and apyrase (an ATPase/ADPase) eliminate the hypo-osmotic potentiation of ACh-stimulated CBF increase and that ATP increased [Ca2+]i and CBF, as well as potentiating ACh-stimulated rises in [Ca2+]i and CBF increase. Moreover, the apical surface of tracheal ciliary cells were stained immunopositive for the P2X4 purinergic receptor. A hypo-osmotic stress (-40 mosM) transiently increased [Ca2+]i and potentiated the ACh-stimulated [Ca2+]i increase. The hypo-osmotic potentiation of ACh-stimulated CBF increase was not detected under Ca2+-free conditions. These observations suggest that a hypo-osmotic stress stimulates ATP release from the trachea. The released ATP may induce further increases in [Ca2+]i and CBF in ACh-stimulated tracheal ciliary cells, which may be mediated by purinergic receptors, such as P2X4.
    Experimental Physiology 12/2004; 89(6):739-51. DOI:10.1113/expphysiol.2004.028670 · 2.67 Impact Factor
  • M Kawakami · K Tokitsu · T Morita · T Hashimoto · T Hayashi · S Sasaki
    [Show abstract] [Hide abstract]
    ABSTRACT: The patient was a 27-year-old man who had been diagnosed as having hyperthyroidism and with an anterior mediastinal mass which was reduced in size after anti-thyroid therapy. This mass was thought to be thymic hyperplasia associated with hyperthyroidism. An anterior mediastinal mass accompanying hyperthyroidism should be surgically treated when it dose not regress after an appropriate antithyroid therapy or there is a clinical suspicion of malignancy.
    Kyobu geka. The Japanese journal of thoracic surgery 07/2004; 57(6):513-5.
  • Manpei Kawakami · Kousuke Tokitsu · Takahiko Hashimoto
    Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association) 01/2004; 65(1):64-67. DOI:10.3919/jjsa.65.64
  • [Show abstract] [Hide abstract]
    ABSTRACT: A 28-year-old man arrived at our hospital complaining of severe dyspnea. Bronchoscopic findings demonstrated that a tumor was located approximately 4 cm distant from the vocal cord, occupying most of the tracheal lumen. To urgently relieve the dyspnea, some parts of the tumor were cauterized with the neodymium:yttrium-aluminum garnet laser. Histopathologic examination of the cauterized specimen revealed malignant hemangiopericytoma. During the operation, the tumor was resected en bloc with a tracheal segment containing four tracheal cartilages. The patient's postoperative course was uneventful with no evidence of recurrence 1 year after the operation.
    The Annals of Thoracic Surgery 10/2003; 76(3):944-6. DOI:10.1016/S0003-4975(03)00137-1 · 3.85 Impact Factor
  • The Journal of the Japanese Associtation for Chest Surgery 01/2003; 17(7):777-781. DOI:10.2995/jacsurg.17.777
  • The Journal of the Japanese Associtation for Chest Surgery 01/2003; 17(5):586-590. DOI:10.2995/jacsurg.17.586
  • The Journal of the Japanese Associtation for Chest Surgery 01/2003; 17(7):762-765. DOI:10.2995/jacsurg.17.762
  • The Journal of the Japanese Associtation for Chest Surgery 01/2001; 15(4):454-458. DOI:10.2995/jacsurg.15.454
  • [Show abstract] [Hide abstract]
    ABSTRACT: As an induction therapy for advanced lung cancer, a patient received bronchial arterial infusion of 30 mg/m2 of docetaxel (TXT). Two weeks after infusion, although the tumor size was not reduced, the central necrotic area was significantly increased. There were no adverse effects. Nineteen days after infusion, we performed a right lower lobectomy and lymph nodal dissection. The resected specimen was examined by immunohistochemistry and biochemistry. The anti-tumor effects were evaluated clinically and the correlation between arterial TXT infusion therapy and apoptosis was studied. Hematoxylin and eosin staining demonstrated moderately differentiated squamous cell carcinoma associated with central necrosis, and cells with chromatin condensation scattered in both the necrotic areas and the margin of this area. It is thought that these findings were the result of this therapy, rather than just the self-necrosis seen in an untreated group.
    Gan to kagaku ryoho. Cancer & chemotherapy 08/2000; 27(7):1029-33.
  • K Nakao · Y Otsuki · Y Akao · Y Ito · O Marukawa · S Tachibana · M Kawakami · S Sasaki
    [Show abstract] [Hide abstract]
    ABSTRACT: We studied the synergistic effects of hyperthermia and anticancer drugs on induction of apoptosis in lung cancer cells (LK-2 and LU-65A) using in situ end-labeling of DNA, the DNA fragmentation assay, and transmission electron microscopy. A few apoptotic cells were detected only when both cell lines were heated at relatively high temperature (44 degrees C). Moderate numbers of apoptotic cells were observed when both cell lines were incubated with high concentrations (30 or 40 microM) of anticancer drug. Compared with hyperthermia or anticancer drug alone, the combined treatment induced many apoptotic cells in both cell lines, even in the cells treated with lower concentrations (6 or 8 microM) of anticancer drugs following mild hyperthermia (43 degrees C). In regard to kinetics of apoptotic cells induced by treatment, the maximum induction of apoptosis by the combined treatment was higher than that of hyperthermia or anticancer drug alone in both cell lines, although the time of the peak of apoptotic index differed among the three treatments. Therefore, "hyperthermo-chemotherapy" may reduce the required dosage of anticancer drug and decrease the temperature of hyperthermia on induction of apoptosis.
    Medical Electron Microscopy 02/2000; 33(1):44-50. DOI:10.1007/s007950000007
  • [Show abstract] [Hide abstract]
    ABSTRACT: We experienced two cases of intrathoracic lipoma arising from the chest wall. The first case was a 55-year-old male, and another case was a 70-year-old female. In the second case, the computed tomography was highly suggestive of a pleural tumor with almost same density as the subcutaneous adipose tissue. This findings may be diagnostic in assessing intrathoracic chest wall type lipoma. Both cases had thoracotomy to remove the tumors. The tumors were easily resectable, though their capsules were partially unclear. We resected the tumors completely together with pleura, periosteum and intercostal muscle. The diagnosis of intramuscular lipoma was confirmed postoperatively by histopathologic examination in each case. When the capsule of lipoma is not clear, combined resection of the tumor and chest wall should be considered. There have been no recurrence of the tumors in our cases.
    Kyobu geka. The Japanese journal of thoracic surgery 04/1999; 52(3):251-3.
  • [Show abstract] [Hide abstract]
    ABSTRACT: A 38-year-old female was found to have abnormal lesion in the left lower lung by chest X-ray examination which was done for her periodical health examination in March, 1997. She was referred to our Institution for operation of the pulmonary lesion by her family physician. The pathology was reported to be adenocarcinoma by the preoperative bronchofiberscopy. As she was Jehovah's witness, she refused to receive either homologous or autologous blood transfusion on the ground of her faith. Prior to the operation, the consultation was held together with the patient, family and doctors in reference to the informed consent. In June, 1997, she had left lower lobectomy without blood transfusion. Postoperative course was uneventful. The problems of surgical treatment in Jehovah's witness rejected blood transfusion are discussed.
    Kyobu geka. The Japanese journal of thoracic surgery 08/1998; 51(7):558-60.
  • [Show abstract] [Hide abstract]
    ABSTRACT: A 36-year-old man with a mediastinal bronchial cyst was reported. CT showed a mass with water density in the posterior mediastinum. MRI revealed that this mediastinal mass had high signal intensity on both T1-weighted and T2-weighted images. MRI was considered to be useful for the qualitative diagnosis of mediastinal tumors as cystic or solid. An operation was performed and histological diagnosis was bronchial cyst. Intracystic fluid study revealed high titer of total protein, amylase and tumor markers, low titer of glucose and LDH.
    Kyobu geka. The Japanese journal of thoracic surgery 08/1998; 51(8 Suppl):710-2.
  • [Show abstract] [Hide abstract]
    ABSTRACT: We report herein the case of a 28-year-old woman who presented with a mediastinal mass, subsequently confirmed to be idiopathic mediastinal fibrosis. Preoperative chest computed tomography (CT) showed a noncalcified mediastinal mass and surgery was performed to exclude malignancy. The mass was hard and dense, involved the left phrenic nerve, vagus nerve, and left upper lobe, and surrounded the subclavian artery, subclavian vein, superior vena cava, and left pulmonary artery. Pathologic examination showed the findings of mediastinal fibrosis and the mass was partially excised. Postoperative medical treatment was performed with prednisolone and tranilast, and a 3-year follow-up has not demonstrated any complications.
    Surgery Today 03/1998; 28(3):335-8. DOI:10.1007/s005950050135 · 1.53 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: We reported a case of aneurysmal bone cyst originating in the left 4th rib. This disease originating in a rib was recorded in only 18 cases in Japan in the literature. The patient was a 16-year-old man and he was first found to have an abnormal shadow in the left upper lung field on the chest roentgenogram. In this case, MRI was very useful to show internal septation of the tumor. We performed a thoracotomy through the left 4th intercostal space with an anteroaxillary skin incision and removed the tumor and the 4th rib completely. Pathological findings showed multiple cysts filled with blood and fibrous trabecullae containing osteoid tissue and multinucleated giant cells, confirming the diagnosis of aneurysmal bone cyst. There has been no evidence of recurrence during the 9 months postoperatively.
    Kyobu geka. The Japanese journal of thoracic surgery 03/1998; 51(2):158-60.
  • Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association) 01/1998; 59(1):99-103. DOI:10.3919/jjsa.59.99
  • [Show abstract] [Hide abstract]
    ABSTRACT: A case of benign schwannoma originating from the lowest trunk of the left brachial plexus with intrathoracic extension was reported. Intrathoracic growth of a schwannoma of the brachial plexus has been reported in only 3 cases in the literature. The patient was a 53-year-old man and he was first found to have an abnormal shadow at the left lung apex on the chest roentogenogram. We performed a thoracotomy through the left third intercostal space with an axillary skin incision and removed the tumor completely. There was no neurological problem postoperatively
    Kyobu geka. The Japanese journal of thoracic surgery 08/1997; 50(7):598-601.
  • The Journal of the Japanese Associtation for Chest Surgery 01/1997; 11(5):636-641. DOI:10.2995/jacsurg.11.636