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Hamada A, Akiyoshi R, Ishii J, Hamada N, Miyazaki C, Hamada T, Ohwaki Y, Ikeda R, Wada M, Nakashima K. Influence of calcium channel blockers in patients with gastrointestinal disease in Japanese community pharmacies. J Clin Pharm Ther 2012; 37:74-7. [DOI: 10.1111/j.1365-2710.2011.01253.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Hamada T, Mizuta E, Kondo T, Hirai M, Yamada K, Kato M, Shigemasa C, Yamamoto Y, Ninomiya H, Igawa O, Hisatome I. Effects of a low-dose antihypertensive diuretic in combination with losartan, telmisartan, or candesartan on serum urate levels in hypertensive patients. ACTA ACUST UNITED AC 2011; 60:71-5. [DOI: 10.1055/s-0031-1296251] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Urashima T, Kurata Y, Miake J, Kato M, Ogura K, Yano A, Adachi M, Tanaka Y, Yamada K, Hamada T, Mizuta E, Kuwabara M, Kato M, Yamamoto Y, Ogino K, Yoshida A, Shirayoshi Y, Hisatome I. Enhancing effects of salicylate on quinidine-induced block of human wild type and LQT3 related mutant cardiac Na+ channels. Biomed Res 2011; 32:303-12. [PMID: 22033299 DOI: 10.2220/biomedres.32.303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
It is unknown whether salicylate enhances the action of antiarrhythmic agents on human Na+ channels with state dependency and tissue specificity. We therefore investigated effects of salicylate on quinidine-induced block of human cardiac and skeletal muscle Na+ channels. Human cardiac wild-type (hH1), LQT3-related mutant (ΔKPQ), and skeletal muscle (hSkM1) Na+ channel α subunits were expressed in COS7 cells. Effects of salicylate on quinidine-induced tonic and use-dependent block of Na+ channel currents were examined by the whole-cell patch-clamp technique. Salicylate enhanced the quinidine-induced tonic and use-dependent block of both hH1 and hSkM1 currents at a holding potential (HP) of -100 mV but not at -140 mV. Salicylate decreased the IC50 value for the quinidine-induced tonic block of hH1 at an HP of -100 mV, and produced a negative shift in the steady-state inactivation curve of hH1 in the presence of quinidine. According to the modulated receptor theory, it is probable that salicylate decreases the dissociation constant for quinidine binding to inactivated-state channels. Furthermore, salicylate significantly enhanced the quinidine-induced tonic and use-dependent block of the peak and steady-state ΔKPQ channel currents. The results suggest that salicylate enhances quinidine-induced block of Na+ channels via increasing the affinity of quinidine to inactivated state channels.
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Fukuda S, Hamada T, Ishii N, Sakaguchi S, Sakai K, Akiyama M, Shimizu H, Masuda K, Izu K, Teye K, Tsuruta D, Karashima T, Nakama T, Yasumoto S, Hashimoto T. Novel adenosine triphosphate (ATP)-binding cassette, subfamily A, member 12 (ABCA12) mutations associated with congenital ichthyosiform erythroderma. Br J Dermatol 2011; 166:218-21. [DOI: 10.1111/j.1365-2133.2011.10516.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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80
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Fukuda S, Tsuruta D, Uchiyama M, Mitsuhashi Y, Kobayashi H, Ishikawa T, Ohyama B, Ishii N, Hamada T, Dainichi T, Karashima T, Nakama T, Yasumoto S, Hashimoto T. Brunsting-Perry type pemphigoid with IgG autoantibodies to laminin-332, BP230 and desmoplakins I/II. Br J Dermatol 2011; 165:433-5. [PMID: 21457206 DOI: 10.1111/j.1365-2133.2011.10343.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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81
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Ishitani K, Kanno H, Uchiyama T, Oka J, Hamada T, Saito K, Matsui H. Impact of polymorphisms on docetaxel-induced neutropenia in Japanese patients with gynecologic cancer. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e13015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Fukumoto Y, Hamada T, Suyama J, Yamamoto A, Naka T. Development of Flowering Stage Inspection Equipment for Small-Flowered Chrysanthemum. JOURNAL OF ROBOTICS AND MECHATRONICS 2011. [DOI: 10.20965/jrm.2011.p0310] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Small chrysanthemums are a major type of cut flower used in Japan for which we are developing flowering stage inspection equipment. This equipment has a camera and a flower carrier. When a flower is input to equipment, the equipment captures the flower image from the zenith, recognizes the flower and leaf parts in the image, determines whether it is appropriate for shipping, and drops it into the appropriate output area. Considering usability, equipment is designed to be attached to the weight grading equipment widely used by growers of small chrysanthemums. In this paper, we introduce this equipment and the results of evaluation experiments.
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Schweitzer GG, Castorena CM, Hamada T, Funai K, Arias EB, Cartee GD. The B2 receptor of bradykinin is not essential for the post-exercise increase in glucose uptake by insulin-stimulated mouse skeletal muscle. Physiol Res 2011; 60:511-9. [PMID: 21401298 DOI: 10.33549/physiolres.932085] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Bradykinin can enhance skeletal muscle glucose uptake (GU), and exercise increases both bradykinin production and muscle insulin sensitivity, but bradykinin's relationship with post-exercise insulin action is uncertain. Our primary aim was to determine if the B2 receptor of bradykinin (B2R) is essential for the post-exercise increase in GU by insulin-stimulated mouse soleus muscles. Wildtype (WT) and B2R knockout (B2RKO) mice were sedentary or performed 60 minutes of treadmill exercise. Isolated soleus muscles were incubated with [³H]-2-deoxyglucose +/-insulin (60 or 100 microU/ml). GU tended to be greater for WT vs. B2RKO soleus with 60 microU/ml insulin (P=0.166) and was significantly greater for muscles with 100 microU/ml insulin (P<0.05). Both genotypes had significant exercise-induced reductions (P<0.05) in glycemia and insulinemia, and the decrements for glucose (approximately 14 %) and insulin (approximately 55 %) were similar between genotypes. GU tended to be greater for exercised vs. sedentary soleus with 60 microU/ml insulin (P=0.063) and was significantly greater for muscles with 100 microU/ml insulin (P<0.05). There were no significant interactions between genotype and exercise for blood glucose, plasma insulin or GU. These results indicate that the B2R is not essential for the exercise-induced decrements in blood glucose or plasma insulin or for the post-exercise increase in GU by insulin-stimulated mouse soleus muscle.
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Hamada T, Hisatome I, Shigemasa C. [Hyperuricemia]. NIHON NAIKA GAKKAI ZASSHI. THE JOURNAL OF THE JAPANESE SOCIETY OF INTERNAL MEDICINE 2011; 100:406-412. [PMID: 21400878 DOI: 10.2169/naika.100.406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
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85
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Egawa T, Hamada T, Ma X, Karaike K, Kameda N, Masuda S, Iwanaka N, Hayashi T. Caffeine activates preferentially α1-isoform of 5'AMP-activated protein kinase in rat skeletal muscle. Acta Physiol (Oxf) 2011; 201:227-38. [PMID: 21241457 DOI: 10.1111/j.1748-1716.2010.02169.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIM Caffeine activates 5'AMP-activated protein kinase (AMPK), a signalling intermediary implicated in the regulation of glucose, lipid and energy metabolism in skeletal muscle. Skeletal muscle expresses two catalytic α subunits of AMPK, α1 and α2, but the isoform specificity of caffeine-induced AMPK activation is unclear. The aim of this study was to determine which α isoform is preferentially activated by caffeine in vitro and in vivo using rat skeletal muscle. METHODS Rat epitrochlearis muscle was isolated and incubated in vitro in the absence or presence of caffeine. In another experiment, the muscle was dissected after intravenous injection of caffeine. Isoform-specific AMPK activity, the phosphorylation status of AMPKα Thr(172) and acetyl-CoA carboxylase (ACC) Ser(79) , the concentrations of ATP, phosphocreatine (PCr) and glycogen, and 3-O-methyl-d-glucose (3MG) transport activity were estimated. RESULTS Incubation of isolated epitrochlearis muscle with 1 mm of caffeine for 15 min increased AMPKα1 activity, but not AMPKα2 activity; concentrations of ATP, PCr and glycogen were not affected. Incubation with 3 mm of caffeine activated AMPKα2 and reduced PCr and glycogen concentrations. Incubation with 1 mm of caffeine increased the phosphorylation of AMPK and ACC and enhanced 3MG transport. Intravenous injection of caffeine (5 mg kg(-1) ) predominantly activated AMPKα1 and increased 3MG transport without affecting energy status. CONCLUSION Our results suggest that of the two α isoforms of AMPK, AMPKα1 is predominantly activated by caffeine via an energy-independent mechanism and that the activation of AMPKα1 increases glucose transport and ACC phosphorylation in skeletal muscle.
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Nindita Y, Hamada T, Bahrudin U, Hosoyamada M, Ichida K, Iwai C, Urashima S, Kuwabara M, Kuwabara N, Utami SB, Mizuta E, Yamada K, Igawa O, Shigemasa C, Ninomiya H, Tsuchihashi T, Hisatome I. Effect of losartan and benzbromarone on the level of human urate transporter 1 mRNA. ARZNEIMITTEL-FORSCHUNG 2010; 60:186-8. [PMID: 20486468 DOI: 10.1055/s-0031-1296271] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
Both an angiotensin II receptor blocker, losartan (CAS 124750-99-8) and a serum urate lowering agent, benzbromarone (CAS 3562-84-3) exert a uricosuric action by inhibiting urate transporter 1 (URAT1). A recent clinical trial indicated that losartan could reduce the level of serum urate in hypertensive patients treated with urate lowering agents, suggesting the different mode of action of losartan from benzbromarone. In the present study, the effect of losartan and benzbromarone on the level of URAT1 mRNA was determined in transfected HEK293 cells. Losartan caused a significant reduction of its mRNA level, whereas it was not affected by benzbromarone. These results indicate that losartan decreases the level of human URAT1 mRNA, which may underlie the uricosuric action of losartan in hypertensive patients treated with serum urate lowering agents.
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Vestergaard M, Hamada T, Morita M, Takagi M. Cholesterol, Lipids, Amyloid Beta, and Alzheimers. Curr Alzheimer Res 2010; 7:262-70. [DOI: 10.2174/156720510791050821] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2008] [Accepted: 05/04/2009] [Indexed: 11/22/2022]
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Hamada T, Teraoka M, Imaki J, Ui-Tei K, Ladher RK, Asahara T. Gene Expression of Spag6 in Chick Central Nervous System. Anat Histol Embryol 2010; 39:227-32. [DOI: 10.1111/j.1439-0264.2010.01000.x] [Citation(s) in RCA: 12] [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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Hashimoto T, Dainichi T, Ohyama B, Hamada T, Ishii N, Sato N, Tanigawa O, Nakayama J, Amano S, Nishiyama T, Karashima T, Nakama T, Yasumoto S. A case of antilaminin 332 mucous membrane pemphigoid showing a blister on the bulbar conjunctiva and a unique epitope on the alpha3 subunit. Br J Dermatol 2010; 162:898-9. [PMID: 20199543 DOI: 10.1111/j.1365-2133.2010.09648.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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90
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Jofré J, Hamada T, Nishimura M, Klattenhoff C. The effect of maximum bite force on marginal bone loss of mini-implants supporting a mandibular overdenture: a randomized controlled trial. Clin Oral Implants Res 2010; 21:243-9. [DOI: 10.1111/j.1600-0501.2009.01834.x] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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91
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Mizuta E, Hamada T, Igawa O, Shigemasa C, Hisatome I. [Calcium antagonists: current and future applications based on new evidence. The mechanisms on lowering serum uric acid level by calcium channel blockers]. CLINICAL CALCIUM 2010; 20:45-50. [PMID: 20048433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
In hypertensive subjects, their serum uric acid levels tend to be higher because of decreasing urinary secretion or overproduction of uric acid. Among calcium channel blockers (CCBs) , long acting nifedipine and cilnidipine reveal serum uric acid lowering action. They decrease the production of uric acid precursor in skeletal muscles under anaerobic condition induced by hypertension or insulin resistance. Hyperuricemia is considered to be a risk factor of not only gout but also renal and cardiovascular diseases, thus, it is important to use CCBs without adverse effect on uric acid metabolisms.
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Hamada T, Hirose R, Kosaka T, Fujita F, Tajima Y, Kanematsu T. Laparoscopic sigmoidectomy using a prolapsing technique for sigmoid colon volvulus in children. Eur J Pediatr Surg 2010; 20:50-2. [PMID: 19370518 DOI: 10.1055/s-0029-1192049] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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93
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Nikawa H, Nishimura H, Yamamoto T, Hamada T, Samaranayake LP. The Role of Saliva and Serum inCandida albicansBiofllm Formation on Denture Acrylic Surfaces. MICROBIAL ECOLOGY IN HEALTH AND DISEASE 2009. [DOI: 10.3109/08910609609167727] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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94
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Morizane S, Setsu N, Yamamoto T, Hamada T, Nakanishi G, Asagoe K, Iwatsuki K. Ichthyosiform eruptions in association with primary cutaneous T-cell lymphomas. Br J Dermatol 2009; 161:115-20. [DOI: 10.1111/j.1365-2133.2009.09109.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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95
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Tsuzaki K, Kotani K, Nagai N, Saiga K, Sano Y, Hamada T, Moritani T, Yoshimura M, Egawa K, Horikawa C, Kitagawa Y, Kiso Y, Sakane N. Adiponectin gene single-nucleotide polymorphisms and treatment response to obesity. J Endocrinol Invest 2009; 32:395-400. [PMID: 19794286 DOI: 10.1007/bf03346474] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
BACKGROUND In the adiponectin gene polymorphisms, single-nucleotide polymorphism (SNP)-45 and SNP276 have reportedly been associated with obesity, Type 2 diabetes, and other features of metabolic syndrome. AIM Whether these adiponectin SNP affect obesity-related parameters during caloric restriction in obese subjects. SUBJECTS AND METHODS Thirty- two obese Japanese women were treated by meal replacement with a low calorie diet for 8 weeks and asked to maintain their habitual lifestyle. Obesity-related parameters were measured before and after the treatment period. We determined four SNP (T45G, I164T, G276T, and C-11377G) using a fluorescent allele-specific DNA primer assay systemand FRET probe assay system. RESULTS After the treatment, the extent of decrease in waist circumference was greater in the subjects with the G/G or G/T genotype of SNP276 than in those with the T/T genotype (p=0.026). As for SNP45, the extent of decrease in triglyceride levels was greater in the subjects with the T/T genotype than in those with the T/G genotype (p=0.003). For SNP-11377, the extent of decrease in systolic blood pressure and fasting plasma glucose was greater in the subjects with the C/G or G/G genotype than in those with the C/C genotype (p=0.044). CONCLUSION Our findings indicate that each SNP in the adiponectin gene might modify the change in obesity-related parameters during meal replacement with a low calorie diet.
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Hamada A, Ishii J, Doi K, Hamada N, Miyazaki C, Hamada T, Ohwaki Y, Wada M, Nakashima K. Increased risk of exacerbating gastrointestinal disease among elderly patients following treatment with calcium channel blockers. J Clin Pharm Ther 2009; 33:619-24. [PMID: 19138239 DOI: 10.1111/j.1365-2710.2008.00958.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND AND OBJECTIVE Calcium channel blockers (CCBs) have been widely used for the treatment of hypertension and angina pectoris. It is presumed that CCBs decrease the lower esophageal sphincter pressure and as a result, the risk of gastrointestinal disease may be increased. Since the prevalence of gastrointestinal diseases has increased in elderly patients, it is possible that treatment with CCBs may have contributed to this increase. Therefore, we considered that the risk of exacerbating gastrointestinal disease among elderly patients by CCBs can be estimated by using the prescription ratio of antisecretory drugs as an outcome. METHOD We hypothesized that patients who are prescribed CCBs would increase the use of antisecretory drugs involving H(2)-receptor antagonists and proton pump inhibitors (PPIs). From January 2001 to December 2005, a dynamic retrospective cohort study was performed at three community pharmacies in Nagasaki city, Japan, to assess the use of antisecretory drugs following treatment with CCBs among elderly patients. The correlation of initiation of antisecretory drugs treatment to maintenance therapy with PPIs was determined by the Cox proportional hazards model. RESULTS The proposed study includes 303 patients prescribed CCBs and 258 controls. During the study period, 138 patients prescribed CCBs and 66 controls were initiated by giving antisecretory drugs; the hazard ratio was 1.40 (95% confidence interval 1.21-1.63). Eighty two patients taking CCBs and 32 controls were initiated by the maintenance therapy with PPIs; the hazard ratio was 1.48 (95% confidence interval 1.21-1.83). CONCLUSION Patients who simultaneously initiated the use of antisecretory drugs with CCBs could not be found. Therefore, antisecretory drugs have not been used to prevent the gastrointestinal diseases caused by CCBs. The results obtained in this study suggest that the risk of gastrointestinal disease could be increased by long-term treatment with CCBs for elderly patients.
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Sasajima Y, Mikami Y, Kaku T, Kiyokawa T, Ohishi Y, Hamada T, Sasaki T, Fujita H, Moriya T, Kasamatsu T, Tsuda H. Gross features of lobular endocervical glandular hyperplasia in comparison with minimal-deviation adenocarcinoma and stage Ib endocervical-type mucinous adenocarcinoma of the uterine cervix. Histopathology 2008; 53:487-90. [DOI: 10.1111/j.1365-2559.2008.03095.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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98
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Hamada T, Ichida K, Hosoyamada M, Mizuta E, Yanagihara K, Sonoyama K, Sugihara S, Igawa O, Hosoya T, Ohtahara A, Shigamasa C, Yamamoto Y, Ninomiya H, Hisatome I. Uricosuric action of losartan via the inhibition of urate transporter 1 (URAT 1) in hypertensive patients. Am J Hypertens 2008; 21:1157-62. [PMID: 18670416 DOI: 10.1038/ajh.2008.245] [Citation(s) in RCA: 114] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND The angiotensin receptor blocker losartan inhibited urate transporter 1 (URAT1) according to in vitro experiments. However, it is still unknown whether the inhibitory effect of losartan on URAT1 contributes to its uricosuric action in humans. METHODS Thirty-two patients with hypertension and nine patients with idiopathic renal hypouricemia (five with and four without hypertension) were enrolled for this study. Hypertensive patients were prescribed oral losartan (50 mg/day, n = 16) or candesartan (8 mg/day, n = 16). Before and after 1-month treatment, the serum concentration of urate (Sur) and creatinine (Scr), and the clearance value of urate (Cur) and creatinine (Ccr) were determined. Clearance studies using the URAT1 inhibitor benzbromarone (100 mg/day) or losartan (50 mg/day) loading test were also performed in these patients. RESULTS Blood pressure (BP) significantly decreased in the patients treated with either losartan or candesartan. Losartan significantly reduced Sur, which was associated with a concomitant increase in the Cur/Ccr ratio, whereas candesartan did not alter these parameters. In hypertensive patients with loss-of-function mutation of URAT1, losartan did not alter either Sur or Cur/Ccr, nor did benzbromarone. The lack of effect of URAT1 inhibitors on renal excretion of urate was independent of the renal function of hypouricemic patients. On the other hand, both losartan and benzbromarone increased Cur/Ccr ratio in hypertensive patients harboring the wild URAT1 gene, regardless of the presence of hypouricemia. CONCLUSIONS These findings suggested that losartan inhibited URAT1 and thereby it lowered Sur levels in hypertensive patients.
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Kedar P, Hamada T, Warang P, Nadkarni A, Shimizu K, Fujji H, Ghosh K, Kanno H, Colah R. Spectrum of novel mutations in the human PKLR gene in pyruvate kinase-deficient Indian patients with heterogeneous clinical phenotypes. Clin Genet 2008; 75:157-62. [PMID: 18759866 DOI: 10.1111/j.1399-0004.2008.01079.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Eighteen unrelated pyruvate kinase (PK)-deficient Indian patients were identified in the past 4 years with varied clinical phenotypes ranging from a mild chronic haemolytic anaemia to a severe transfusion-dependent disorder. We identified 17 different mutations in the PKLR gene among the 36 mutated alleles. Ten novel mutations were identified: 427G>A, 499C>A, 1072G>A, 1180G>T, 1216G>A, 1220A>G, 644delG, IVS5 (+20) C>A, IVS9 (+44) C>T, and IVS9 (+93) A>C. A severe syndrome was commonly associated with some mutations, 992A>G, 1436G>A, 1220A>G, 644delG and IVS9 (+93) A>C, in the PKLR gene. Molecular graphics analysis of human red blood cell PK (RPK), based on the crystal structure of human PK, shows that mutations located near the substrate or fructose 1,6-diphosphate binding site may change the conformation of the active site, resulting in very low PK activity and severe clinical symptoms. The mutations target distinct regions of RPK structure, including domain interfaces and catalytic and allosteric sites. In particular, the 1216G>A and 1219G>A mutations significantly affect the interdomain interaction because they are located near the catalytic site in the A/B interface domains. The most frequent mutations in the Indian population appear to be 1436G>A (19.44%), followed by 1456C>T (16.66%) and 992A>G (16.66%). This is the first study to correlate the clinical profile with the molecular defects causing PK deficiency from India where 10 novel mutations that produce non-spherocytic haemolytic anaemia were identified.
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Hamada T, Ishii N, Fukuda S, Takagi A, Yasumoto S, Ikeda S, Hashimoto T. A new c.2541delC mutation in the ATP2A2 gene in a Japanese patient with Darier's disease. J Eur Acad Dermatol Venereol 2008; 23:457-8. [PMID: 18624837 DOI: 10.1111/j.1468-3083.2008.02902.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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