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Ohno Y, Nakatani M, Ito T, Matsui Y, Ando K, Suda Y, Ohashi K, Yokoyama S, Goto K. Activation of Lactate Receptor Positively Regulates Skeletal Muscle Mass in Mice. Physiol Res 2023; 72:465-473. [PMID: 37795889 PMCID: PMC10634564 DOI: 10.33549/physiolres.935004] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Accepted: 05/23/2023] [Indexed: 01/05/2024] Open
Abstract
G protein-coupled receptor 81 (GPR81), a selective receptor for lactate, expresses in skeletal muscle cells, but the physiological role of GPR81 in skeletal muscle has not been fully elucidated. As it has been reported that the lactate administration induces muscle hypertrophy, the stimulation of GPR81 has been suggested to mediate muscle hypertrophy. To clarify the contribution of GPR81 activation in skeletal muscle hypertrophy, in the present study, we investigated the effect of GPR81 agonist administration on skeletal muscle mass in mice. Male C57BL/6J mice were randomly divided into control group and GPR81 agonist-administered group that received oral administration of the specific GPR81 agonist 3-Chloro-5-hydroxybenzoic acid (CHBA). In both fast-twitch plantaris and slow-twitch soleus muscles of mice, the protein expression of GPR81 was observed. Oral administration of CHBA to mice significantly increased absolute muscle weight and muscle weight relative to body weight in the two muscles. Moreover, both absolute and relative muscle protein content in the two muscles were significantly increased by CHBA administration. CHBA administration also significantly upregulated the phosphorylation level of p42/44 extracellular signal-regulated kinase-1/2 (ERK1/2) and p90 ribosomal S6 kinase (p90RSK). These observations suggest that activation of GRP81 stimulates increased the mass of two types of skeletal muscle in mice in vivo. Lactate receptor GPR81 may positively affect skeletal muscle mass through activation of ERK pathway.
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Onishi T, Nakatani M, Matsumoto R, Shibahara T, Sekito S, Kajiwara S, Okamoto T. A prospective randomized study comparing short-time with long-time continuous saline bladder irrigation after transurethral resection in non-muscular invasive bladder cancer. Eur Urol 2023. [DOI: 10.1016/s0302-2838(23)00756-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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Nakazawa R, Azuma N, Suzuki M, Nakatani M, Nankou T, Furuyoshi S, Yasuda A, Takata S, Tani N, Kobayashi F. A New Treatment for Dialysis-Related Amyloidosis with β 2-Microglobulin Adsorbent Column. Int J Artif Organs 2018. [DOI: 10.1177/039139889301601207] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Dialysis-related amyloidosis (DRA) is characterized by the presence of β 2-microglobulin (β 2-m) in the plasma. In order to eliminate β 2-m from the circulating blood, the β 2-m selective adsorbent for direct hemoperfusion (DHP) was developed. A DHP column (BM-01), containing 350 ml of the adsorbent, was subjected to clinical trials. The column was connected with a PAN (AN69) membrane dialyzer in series and used 3 times a week for 1 week (11 patients), 4 weeks (5 patients), 6 months (1 patient) and 12 months (2 patients). The percent reduction (%) of β 2-m was for 16 patients (for 1 or 4 weeks), more than 65, and for 3 patients (for more than 6 months), 76.5 ± 4.9, 73.5 ± 5.7, 72.2 ± 6.2. At the end of each session, β 2-m plasma levels were found to be below 10 mg/L, with 3.4 mg/L being the lowest. The total amounts of β 2-m removed were 172.5 ± 22.3, 257.0 ± 75.6, 157.6 ± 32.2 and 429.8 mg/session at max. Two out of these three patients had a favorable effect on joint symptoms and ocular fundus. It can be concluded that this selective adsorption therapy may delay the progression of DRA, and is worth considering for wide application.
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Nakatani M, Matsumoto R, Kobayshi K, Hitomi T, Inouchi M, Matsuhashi M, Kinoshita M, Kikuchi T, Yoshida K, Kunieda T, Takahashi R, Hattori N, Ikeda A. Inhibitory effects of electric cortical stimulation on interictal epileptiform discharges in human epileptic focus. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Nakatani M, Migita K, Matsumoto S, Wakatsuki K, Ito M, Nakade H, Kunishige T, Kitano M, Kanehiro H. Prognostic significance of the prognostic nutritional index in esophageal cancer patients undergoing neoadjuvant chemotherapy. Dis Esophagus 2017; 30:1-7. [PMID: 28575242 DOI: 10.1093/dote/dox020] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Accepted: 03/06/2017] [Indexed: 12/11/2022]
Abstract
Nutritional status is one of the most important issues faced by cancer patients. Several studies have shown that a low preoperative nutritional status is associated with a worse prognosis in patients with various types of cancer, including esophageal cancer (EC). Recently, neoadjuvant chemotherapy (NAC) and/or radiotherapy have been accepted as the standard treatment for resectable advanced EC. However, NAC has the potential to deteriorate the nutritional status of a patient. This study aimed to evaluate the prognostic significance of the nutritional status for EC patients who underwent NAC. We retrospectively reviewed 66 squamous cell EC patients who underwent NAC consisting of docetaxel, cisplatin, and 5-fluorouracil followed by subtotal esophagectomy at Nara Medical University Hospital between January 2009 and August 2015. To assess the patients' nutritional status, the prognostic nutritional index (PNI) before commencing NAC and prior to the operation was calculated as 10 × serum albumin (g/dl) + 0.005 × total lymphocyte count in the peripheral blood (per mm3). The cutoff value of the PNI was set at 45. A multivariable analysis was performed to identify prognostic factors for overall survival (OS) and relapse-free survival (RFS). The mean pre-NAC and preoperative PNI were 50.2 ± 5.7 and 48.1 ± 4.7, respectively (P = 0.005). The PNI decreased following NAC in 44 (66.7%) patients. Before initiating NAC, 9 (13.6%) patients had a low PNI, and 12 (18.2%) patients had a low PNI prior to the operation. The pre-NAC PNI and preoperative PNI were significantly associated with the OS (P = 0.013 and P = 0.004, respectively) and RFS (P = 0.036 and P = 0.005, respectively) rates. The multivariable analysis identified the preoperative PNI as an independent prognostic factor for poor OS and RFS, although the pre-NAC PNI was not an independent predictor. Our results suggest that the preoperative PNI is a useful marker for predicting the long-term outcomes of EC patients undergoing NAC and subsequent subtotal esophagectomy. Therefore, patients with a low preoperative nutritional status may be at a higher risk of EC recurrence.
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Usui S, Maeo S, Tayashiki K, Nakatani M, Kanehisa H. Low-load Slow Movement Squat Training Increases Muscle Size and Strength but Not Power. Int J Sports Med 2015; 37:305-12. [PMID: 26667928 DOI: 10.1055/s-0035-1564255] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
We tested a hypothesis that low-load squat training with slow movement and tonic force generation (LST) would increase muscle size and strength but not necessarily power. Healthy young men were assigned to LST [50% one-repetition maximum (1-RM) load, 3 s for lowering/lifting without pause: n=9] or low-load normal speed (LN: 50% 1-RM load, 1 s for lowering/lifting with 1-s pause; n=7) groups. Both groups underwent an 8-week squat training program (10 repetitions/set, 3 sets/day, and 3 days/week) using the assigned methods. Before and after the intervention, quadriceps femoris muscle thickness, maximal torque during isometric hip extension and knee extension, 1-RM squat, lifting power from squatting position and rate of electromyography rise (RER) in knee extensors during the task, leg extension power and vertical jump height were measured. After the intervention, the LN group showed no changes in all the variables. The LST group significantly (P<0.05) increased muscle thickness (6-10%), isometric hip extension torque (18%) and 1-RM squat (10%), but not isometric knee extension torque, lifting power and RER, leg extension power and vertical jump height. These results suggest that LST can increase muscle size and task-related strength, but has little effect on power production during dynamic explosive movements.
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Kariya S, Nakatani M, Yoshida R, Ueno Y, Komemushi A, Tanigawa N. REPEATED INTRANODAL LYMPHANGIOGRAPHY FOR THE TREATMENT OF LYMPHATIC LEAKAGE. Lymphology 2015; 48:59-63. [PMID: 26714370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Treatment of patients with chylous or non-chylous lymphatic leakage can be difficult. An approach using therapeutic lymphangiography can reduce the lymphatic leakage, but it seldom stops the leakage immediately and subsequent conservative treatment is necessary. We report three cases in which intranodal lymphangiography was performed multiple times to inhibit lymphatic leakage. In each case, the lymph node was punctured under ultrasound guidance using a 23-gauge needle and lipiodol was injected manually at a rate of 1 ml/3 min. The procedure was repeated twice in two cases of gastrointestinal carcinoma and four times in one case of lymphoma. In all three cases, the postoperative lymphatic leakage stopped after the repeated intranodal lymphangiography.
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Uezumi A, Fukada S, Yamamoto N, Ikemoto-Uezumi M, Nakatani M, Morita M, Yamaguchi A, Yamada H, Nishino I, Hamada Y, Tsuchida K. Identification and characterization of PDGFRα+ mesenchymal progenitors in human skeletal muscle. Cell Death Dis 2014; 5:e1186. [PMID: 24743741 PMCID: PMC4001314 DOI: 10.1038/cddis.2014.161] [Citation(s) in RCA: 211] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Revised: 03/03/2014] [Accepted: 03/04/2014] [Indexed: 02/07/2023]
Abstract
Fatty and fibrous connective tissue formation is a hallmark of diseased skeletal muscle and deteriorates muscle function. We previously identified non-myogenic mesenchymal progenitors that contribute to adipogenesis and fibrogenesis in mouse skeletal muscle. In this study, we report the identification and characterization of a human counterpart to these progenitors. By using PDGFRα as a specific marker, mesenchymal progenitors can be identified in the interstitium and isolated from human skeletal muscle. PDGFRα+ cells represent a cell population distinct from CD56+ myogenic cells, and adipogenic and fibrogenic potentials were highly enriched in the PDGFRα+ population. Activation of PDGFRα stimulates proliferation of PDGFRα+ cells through PI3K-Akt and MEK2-MAPK signaling pathways, and aberrant accumulation of PDGFRα+ cells was conspicuous in muscles of patients with both genetic and non-genetic muscle diseases. Our results revealed the pathological relevance of PDGFRα+ mesenchymal progenitors to human muscle diseases and provide a basis for developing therapeutic strategy to treat muscle diseases.
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Suzuki S, Komemushi A, Sano A, Kariya S, Kanno S, Nakatani M, Yoshida R, Kono Y, Tanigawa N. Short term efficacy and safety of balloon-occluded retrograde transvenous obliteration of portosystemic shunt in patients with hepatic encephalopathy. J Vasc Interv Radiol 2014. [DOI: 10.1016/j.jvir.2013.12.332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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10
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Yoshida R, Kariya S, Nakatani M, Kono Y, Komemushi A, Tanigawa N. Renal volume reduction by transcatheter renal artery embolization with N-butyl cyanoacrylate for symptomatic polycystic kidney disease. J Vasc Interv Radiol 2014. [DOI: 10.1016/j.jvir.2013.12.142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Figueira ER, Rocha-Filho JA, Nakatani M, Buto MF, Tatebe ER, Andre VO, Cecconello I, D'Albuquerque LA. Hepatic ischemic preconditioning increases portal vein flow in experimental liver ischemia reperfusion injury. Hepatobiliary Pancreat Dis Int 2014; 13:40-7. [PMID: 24463078 DOI: 10.1016/s1499-3872(14)60005-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
BACKGROUND Ischemic preconditioning (IPC) has been shown to decrease liver injury and to increase hepatic microvascular perfusion after liver ischemia reperfusion. This study aimed to evaluate the effects of IPC on hemodynamics of the portal venous system. METHODS Thirty-two rats were randomized into two groups: IPC group and control group. The rats of the IPC group underwent IPC by 10 minutes of liver ischemia followed by 10 minutes of reperfusion before liver ischemia, and the rats of the control group were subjected to 60 minutes of partial liver ischemia. Non-ischemic lobes were resected immediately after reperfusion. The animals were studied at 4 hours and 12 hours after reperfusion. Mean arterial pressure, heart rate, portal vein flow and pressure were analyzed. Blood was collected for the determination of the levels of aspartate aminotransferase, alanine aminotransferase, calcium, lactate, pH, bicarbonate, and base excess. RESULTS IPC increased the mean portal vein flow at 4 hours and 12 hours after reperfusion. IPC recovered 78% of the mean portal vein flow at 12 hours after reperfusion. IPC decreased the levels of aspartate aminotransferase, alanine aminotransferase and lactate, and increased the levels of ionized calcium, bicarbonate and base excess at 12 hours after reperfusion. CONCLUSIONS This study demonstrated that IPC increases portal vein flow and enhances hepatoprotective effects in liver ischemia reperfusion. The better recovery of portal vein flow after IPC may be correlated with the lower levels of transaminases and with the better metabolic profile.
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Kariya S, Komemushi A, Nakatani M, Yoshida R, Sawada S, Tanigawa N. Re: CO2 microbubble contrast enhancement in x-ray angiography. A reply. Clin Radiol 2013; 68:1180. [DOI: 10.1016/j.crad.2013.06.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2013] [Accepted: 06/03/2013] [Indexed: 11/26/2022]
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13
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Nakatani M, Fukuda T, Sasamoto H, Arakawa N, Otaka H, Kawasoe T, Omata S. Relationship between perceived softness of bilayered skin models and their mechanical properties measured with a dual-sensor probe. Int J Cosmet Sci 2012; 35:84-8. [DOI: 10.1111/ics.12008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Accepted: 09/03/2012] [Indexed: 11/30/2022]
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Kariya S, Komemushi A, Nakatani M, Yoshida R, Sawada S, Tanigawa N. CO2 microbubble contrast enhancement in x-ray angiography. Clin Radiol 2012; 68:346-51. [PMID: 22981730 DOI: 10.1016/j.crad.2012.08.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Revised: 07/26/2012] [Accepted: 08/06/2012] [Indexed: 12/23/2022]
Abstract
AIM To demonstrate that carbon dioxide (CO2) microbubble contrast enhancement depicts blood vessels when used for x-ray examinations. MATERIALS AND METHODS Microbubbles were generated by cavitation of physiological saline to which CO2 gas had been added using an ejector-type microbubble generator. The input pressure values for CO2 gas and physiological saline that produced a large quantity of CO2 microbubbles were obtained in a phantom. In an animal study, angiography was performed in three swine using three types of contrast: CO2 microbubbles, conventional CO2 gas, and iodinated contrast medium. For CO2 microbubble contrast enhancement, physiological saline, and CO2 gas were supplied at the input pressures calculated in the phantom experiment. Regions of interest were set in the abdominal aorta, external iliac arteries, and background. The difference in digital values between each artery and the background was calculated. RESULTS The input pressures obtained in the phantom experiment were 0.16 MPa for physiological saline and 0.5 MPa for CO2 gas, with physiological saline input volume being 8.1 ml/s. Three interventional radiologists all evaluated the depictions of all arteries as "present" in the CO2 microbubble contrast enhancement, conventional CO2 contrast enhancement, and iodinated contrast enhancement performed in three swine. Digital values for all vessels with microbubble CO2 contrast enhancement were higher than background values. CONCLUSIONS In x-ray angiography, blood vessels can be depicted by CO2 microbubble contrast enhancement, in which a large quantity of CO2 microbubbles is generated within blood vessels.
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Nagata K, Nakatani M, Yoshida S. A revised rate- and state-dependent friction law obtained by constraining constitutive and evolution laws separately with laboratory data. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011jb008818] [Citation(s) in RCA: 122] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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Nakatani M, Kawasoe T, Denda M. Sex difference in human fingertip recognition of micron-level randomness as unpleasant. Int J Cosmet Sci 2011; 33:346-50. [DOI: 10.1111/j.1468-2494.2010.00634.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Tanigawa N, Kariya S, Tokuda T, Nakatani M, Yagi R, Komemushi A, Sawada S. Abstract No. 14: Prospective analysis of respiratory function following percutaneous vertebroplasty for osteoporotic compression fractures. J Vasc Interv Radiol 2010. [DOI: 10.1016/j.jvir.2009.12.156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Denda M, Nakatani M. Acceleration of permeability barrier recovery by exposure of skin to 10-30 kHz sound. Br J Dermatol 2009; 162:503-7. [DOI: 10.1111/j.1365-2133.2009.09509.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Nakatani M, Ando K, Houjou K. Oxidation behaviour of Si3N4/Y2O3 system ceramics and effect of crack-healing treatment on oxidation. Ann Ital Chir 2008. [DOI: 10.1016/j.jeurceramsoc.2007.10.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Tsuchida K, Sunada Y, Noji S, Murakami T, Uezumi A, Nakatani M. Inhibitors of the TGF-β Superfamily and their Clinical Applications. Mini Rev Med Chem 2006; 6:1255-61. [PMID: 17100637 DOI: 10.2174/138955706778742759] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The transforming growth factor-beta (TGF-beta) superfamily includes TGF-betas, activin, myostatin and bone morphogenetic proteins. Misregulation of the activity of TGF-beta family members is involved in pathogenesis of cancer, muscular dystrophy, obesity and bone and tooth remodeling. Natural inhibitors for the TGF-beta superfamily regulate fine-tuning of activity of TGF-beta family in vivo. In addition to natural inhibitors for the TGF-beta family, soluble forms of receptors for the TGF-beta family, blocking monoclonal antibodies and small chemical TGF-beta inhibitors have been developed. In this review, we summarize recent advances in our understanding of inhibitors for the TGF-beta superfamily and their medical applications.
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Seki T, Hinohara Y, Taki C, Nakatani M, Ozawa M, Nishimura S, Takaki A, Itho H, Takenoya F, Shioda S. PACAP Stimulates the Release of Interleukin-6 in Cultured Rat Muller Cells. Ann N Y Acad Sci 2006; 1070:535-9. [PMID: 16888221 DOI: 10.1196/annals.1317.043] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
We have investigated the in vivo effect of PACAP on rat Müller cells that are the predominant glial element in the retina. Müller cells were treated with PACAP38, either alone or in the presence of the PACAP-selective antagonist, PACAP6-38. Cellular proliferation was determined by measuring the incorporation of bromodeoxyuridine, while interleukin-6 (IL-6) levels in the culture medium were examined using a B9 cell bioassay. In cultured rat Müller cells, the expression of PACAP receptor (PAC1-R) was assessed with immunohistochemistry using a PAC1-R-specific antiserum. PACAP stimulated IL-6 production in Müller cells at a concentration as low as 10(-12) M, which was not sufficient to induce cell proliferation. This elevation of IL-6 production was significantly inhibited by PACAP6-38. These data suggest that Müller cells are one of the target cells for PACAP, stimulating the release of IL-6, and providing a mechanism whereby PACAP exerts a significant neuroprotective effect in the retina.
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Kawaguchi T, Nakatani M, Kawano T. Study of Dural Arteriovenous Fistula Drains into Leptomeningeal Vein without Sinus Interposition. Interv Neuroradiol 2004; 10 Suppl 1:127-34. [PMID: 20587288 DOI: 10.1177/15910199040100s122] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2004] [Accepted: 01/20/2004] [Indexed: 11/16/2022] Open
Abstract
SUMMARY We evaluated dural arteriovenous fistulas (DAVF) drains into leptomeningeal vein (LMV) without the venous sinus interposition. This type of DAVF contained the extra-sinusal type DAVF and the DAVF with so-called pure leptomeningeal venous drainage (PLMVD).We studied 15 patients with DAVF that flows into LMVD without passing into the sinus. The subjects were 5 patients with DAVF in the anterior cranial fossa, 2 with DAVF in the tentorium cerebelli, and 3 with DAVF in the craniocervical junction as extra-sinusal type DAVF and 3 with DAVF in the transverse sigmoid sinus and 2 with DAVF in the superior sagittal sinus as DAVF with PLMVD. This type appears to take a very aggressive course. The arterial pressure of the shunt is directly applied to LMV, which causes bending and winding of the vein, eventually varices, inducing intracranial haemorrhage or venous ischemia in the LMV reflux area. Emergency treatment should be performed as soon as possible. Although it is recognized that interruption of the draining vein is very effective, treatment methods such as TAE, direct surgery, and g knife treatment, or their combinations should be carefully chosen for each case.
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Shibata M, Suzuki H, Nakatani M, Koba S, Geshi E, Katagiri T, Takeyama Y. The involvement of vascular endothelial growth factor and flt-1 in the process of neointimal proliferation in pig coronary arteries following stent implantation. Histochem Cell Biol 2001; 116:471-81. [PMID: 11810189 DOI: 10.1007/s00418-001-0336-4] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/21/2001] [Indexed: 11/30/2022]
Abstract
To clarify the role of vascular endothelial growth factor (VEGF) in the process of restenosis, a Palmaz-Schatz stent was implanted in the left anterior descending coronary artery of male pigs at 2 weeks after balloon injury (balloon/artery ratio 1.2:1). The animals were euthanized at 1, 2, and 4 weeks after stenting, and western blot and immunohistochemical analysis were performed using VEGF, fms-like tyrosine kinase (flt)-1, and platelet-derived growth factor (PDGF) antibodies. The expressions of VEGF and flt-1 protein in the neointima were observed as early as 1 week after stenting and remained for up to 4 weeks, while re-endothelialization was complete at 2 weeks. These protein expressions were demonstrated in proliferated smooth muscle cells throughout the entire period after stenting and, in addition, they were observed in the macrophages and endothelial cells of microvessels around stent struts at 4 weeks. The expression pattern of VEGF corresponded with that of PDGF, a growth factor well-known to induce neointimal proliferation. The cell proliferative activity, measured by the proliferating cell nuclear antigen index, around the struts remained high until 4 weeks after stenting, while that in the other areas declined at 4 weeks. These results suggest that VEGF is involved in the process of restenosis not only through its angiogenic properties and induction of monocyte chemotaxis, but also by a synergistic effect with PDGF.
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MESH Headings
- Animals
- Blotting, Western
- Cell Count
- Cell Division
- Coronary Restenosis/metabolism
- Coronary Restenosis/pathology
- Coronary Vessels/metabolism
- Coronary Vessels/pathology
- Coronary Vessels/surgery
- Endothelial Growth Factors/metabolism
- Endothelium, Vascular/metabolism
- Endothelium, Vascular/pathology
- Extracellular Matrix Proteins/metabolism
- Fluorescent Antibody Technique, Indirect
- Immunoenzyme Techniques
- Lymphokines/metabolism
- Macrophages/metabolism
- Macrophages/pathology
- Male
- Monocytes/metabolism
- Monocytes/pathology
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/pathology
- Neovascularization, Pathologic/metabolism
- Neovascularization, Pathologic/pathology
- Platelet-Derived Growth Factor/metabolism
- Proliferating Cell Nuclear Antigen/metabolism
- Stents
- Swine
- Tunica Intima/metabolism
- Tunica Intima/pathology
- Vascular Endothelial Growth Factor A
- Vascular Endothelial Growth Factors
- von Willebrand Factor/metabolism
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Abdelgaleil SA, Kassem SM, Doe M, Baba M, Nakatani M. Diterpenoids from Euphorbia paralias. PHYTOCHEMISTRY 2001; 58:1135-1139. [PMID: 11730879 DOI: 10.1016/s0031-9422(01)00393-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Two segatane diterpenoids containing a bicyclic [4,3,1] ring system were isolated, together with 11 known diterpenoids, four segetanes, five jatrophanes and two paralianes, from the aerial parts of Euphorbia paralias. The structures of the new compounds were established by spectroscopic means, including by 2D NMR and CD spectroscopic analyses. The antifeedant and antiviral activities of the isolated compounds are also described.
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Yorozuya M, Takeyama Y, Iso Y, Shibata M, Nakatani M, Koba S, Suzuki H, Murakami M, Katagiri T. [Morphological and histological studies of in-stent restenosis in seven types of stents implanted in porcine coronary arteries]. J Cardiol 2001; 38:273-80. [PMID: 11729727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
OBJECTIVES Differences in the mechanism of restenosis after stenting between coil and tubular stents were examined in porcine coronary arteries using histological and immunohistochemical methods. METHODS Twenty-four pigs underwent balloon-induced injury in the left anterior descending coronary artery. Two weeks later, seven different stents clinically available in Japan (Coil stents: GR I, GR II, Wiktor, Cordis; Tubular stents: gfx, Multilink, Palmaz-Schatz) were implanted in the injured site. Four weeks after the stent implantation, the pigs were sacrificed for histological examination and for morphometrical analysis of the lumen, neointima, media and adventitia. Immunohistochemical studies using anti-proliferating cell nuclear antigen (PCNA), anti-alpha-smooth muscle actin and anti-macrophage antibody were also performed. RESULTS The coil stents formed eccentric, and the tubular stents formed concentric neointimal proliferation. Although there was no difference in the area of neointima between the stents, the area of lumen in the tubular stents was bigger than that in the coil stents (p < 0.01), because the vascular area was bigger in the tubular stents (p < 0.05). Immunohistochemical examination found many PCNA-positive cells in the proliferated neointima, especially in the area around the stent strut. Many of these cells around the stent strut were positively stained by anti-macrophage antibody. Other cells positively stained for PCNA were confirmed as smooth muscle cells. CONCLUSIONS Tubular stents maintained a wider lumen than coil stents, because negative remodeling after stenting was less in the tubular stents. Implantation of stents with less negative remodeling is very important to prevent restenosis after stenting.
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