676
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Yu RC, Williams JM, Wang HH, Thompson JE, Kini AM, Carlson KD, Ren J, Whangbo M, Chaikin PM. Anisotropic thermopower of the organic superconductor kappa -(BEDT-TTF)2Cu. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:6932-6936. [PMID: 9998575 DOI: 10.1103/physrevb.44.6932] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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677
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Ren J, Hamada J, Okada F, Takeichi N, Morikawa K, Hosokawa M, Kobayashi H. Correlation between the presence of microvilli and the growth or metastatic potential of tumor cells. Jpn J Cancer Res 1990; 81:920-6. [PMID: 1977729 PMCID: PMC5918116 DOI: 10.1111/j.1349-7006.1990.tb02668.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
We used an electron microscope to examine microvilli which appear on the surfaces of various tumor cells with high or low growth potential and/or metastatic ability. The results show that a greater number of microvilli appeared on the surfaces of tumor cells (QRpP and ERpP) which possess high growth potential than on tumor cells (QR and ER) with low growth potential. We also observed that microvilli were more abundant on the surface of highly metastatic clone cells, i.e. c-SST-2 (cl-2), mouse B16 melanoma (F-10) and human colon carcinoma (KM12SM) than on weakly metastatic clone cells, c-SST-2 (cl-4-2), B16 (F-1) and (KM12C). At the same time, more microvilli were observed on the surface of B16 BL6 cells, which were obtained from the metastatic site of the B16 F10 cells, than on the surface of the parent B16 F10 cells. Immunoelectron microscopy revealed that the c-neu oncogene product, which is closely related to an epidermal growth factor receptor, was positively stained in the microvilli of tumor cells (ERpP) with high growth potential and high metastatic ability, whereas the tumor cells (ER) with low growth potential and weak metastatic ability were not stained. These findings suggest that the increased presence of microvilli correlates closely with the growth potential and metastatic ability of tumor cells.
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678
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Ren J, Pan BR, Li MF, Lu P, Yan PS, Miao JY, Dong Y, Luo WH. Preliminary study on the microbiology of Campylobacter pyloridis and gastric histopathology. Keio J Med 1990; 39:112-6. [PMID: 2214500 DOI: 10.2302/kjm.39.112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Biopsy samples were taken endoscopically from the antral-mucosa of 693 patients with peptic ulcer and chronic gastritis presenting dyspepsia symptoms. Campylobacter pyloridis cultures were positive in 59 of 98 (60.2%) cases and histopathologically the organisms were found in 411 of 693 cases (59.3%). Pathologically, Campylobacter pyloridis was positive in 273 out of 300 patients with chronic superficial gastritis (91.0%), in 102 of 249 patients with chronic atrophic gastritis (40.9%), in 36 out of 144 patients with chronic atrophic gastritis with intestinalization or dysplasia (25.0%). We found that there was a significant association between the presence of Campylobacter pyloridis and chronic superficial gastritis, also the degree of lymphocyte infiltration showed a strong inverse association with the presence of Campylobacter pyloridis, suggesting that a local immune response might exert an important action in the eradication of this organism. These findings support the view that Campylobacter pyloridis, may be etiologically related to chronic gastritis and peptic ulceration, even though its role still remains to be determined.
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679
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Fan Y, Gan B, Chen S, Chen W, Ren J, Chen L. [Pest control and yield increase of areca by root-zone application of carbofuran in admixture with fertilizers]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1990; 15:204-6, 253. [PMID: 2169759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The result of our experiment has shown that by root-zone application of carbofuran in admixture with fertilizers to Areca in spring the serious pest Tirathaba rufivena can be controlled for 4 months during flowering and young fruiting stage and the yield can increase by 50%. The final residual amount of carbofuran in fruits is below 0.1-0.01 ppm or too low to be examined, and there is no decrease in total alkaloid content in fruits.
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680
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Mittal RK, Ren J, McCallum RW, Shaffer HA, Sluss J. Modulation of feline esophageal contractions by bolus volume and outflow obstruction. THE AMERICAN JOURNAL OF PHYSIOLOGY 1990; 258:G208-15. [PMID: 2305886 DOI: 10.1152/ajpgi.1990.258.2.g208] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
We studied the effect of bolus volume and esophageal obstruction on esophageal peristalsis by using synchronized video-fluoroscopic and manometric techniques in cats. A specially designed pressure cuff was surgically implanted around the distal esophagus to control the degrees of outflow obstruction. Secondary esophageal peristalsis was evoked by injecting bolus volumes of 3, 6, and 9 ml at cuff pressures of 0, 20, 40, and 60 mmHg. Increases in outflow obstruction reduced the velocity of peristalsis. The amplitude of esophageal contraction increased with increasing outflow obstruction at low bolus volumes but decreased with larger bolus volumes and larger outflow obstruction. In the absence of outflow obstruction, each esophageal contraction traversed the entire esophagus distal to its site of origin, but in the presence of outflow obstruction contractions only traversed part of the esophagus. The incidence and site of failure of propagation was directly related to cuff pressure and bolus volume. The relationship between the onset of manometric pressure complex at a given site in the esophagus to the passage of the bolus from that esophageal site was markedly affected by outflow obstruction. We conclude that esophageal peristalsis can be modulated by the bolus volume and outflow obstruction.
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681
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Ren J, Hamada J, Takeichi N, Fujikawa S, Kobayashi H. Ultrastructural differences in junctional intercellular communication between highly and weakly metastatic clones derived from rat mammary carcinoma. Cancer Res 1990; 50:358-62. [PMID: 2295075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
We examined by electron microscopy the differences in junctional intercellular communications among highly metastatic clones, weakly metastatic clones, and the parent clone obtained from a spontaneously developed rat mammary carcinoma. We also investigated intercellular communications of the highly and weakly metastatic clone cells with normal fibroblasts. The results showed that ultrastructural changes of the highly metastatic clone cells, such as microvilli, microfilaments, and small organelles including endoplasmic reticulum, Golgi apparatus, and mucous particles, were more distinct than those of the weakly metastatic clone cells, and that the numbers of desmosome and gap junctions of weakly metastatic clone cells were significantly greater than those of highly metastatic clone cells. The formation of gap junctions and desmosomes was found only between weakly metastatic clone cells and normal fibroblasts. When both highly and weakly metastatic clone cells were cultured with normal fibroblasts, a tight junction was observed only in the culture of weakly metastatic clone cells and normal fibroblasts. These results suggest that ultrastructural differences are related to the proliferation and detachment of tumor cells from the primary site in the initial stage of tumor metastasis.
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682
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Ren J, Schulze-Delrieu K. Movement of wax particles by contractions in the isolated opossum esophagus. THE AMERICAN JOURNAL OF PHYSIOLOGY 1990; 258:G164-70. [PMID: 2301578 DOI: 10.1152/ajpgi.1990.258.1.g164] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
We investigated whether the contractions of the isolated smooth muscle opossum esophagus can propel luminal contents. Wax particles were placed into the esophagus in vitro, and esophageal contractions were evoked by stimulating either primarily the intrinsic esophageal nerves (using electrical pulses of 0.5 ms) or the esophageal muscle directly (using pulses of 0.5 s). Direct muscle stimulation and neural stimulation produced circular muscle contractions of similar amplitude, but only neural stimulation was associated with a propagating ring contraction and longitudinal muscle contraction. Movement of the wax particle occurred after 21% of all stimulus responses. Aborad movement of the wax particle was 10 times as common as was its orad movement. Wax movement occurred less commonly and over shorter distance with muscle as compared with neural stimulation. The distance the wax moved was enhanced when the esophagus was allowed to shorten in its longitudinal axis. Movement occurred late during the contraction response and at velocities less than that of the ring contraction. Also, the ring contraction passed over the particle. The amplitude of circular muscle contractions had no predictive value for the occurrence of propulsion. The finding that the isolated esophagus can propel luminal contents in the aborad direction supports the thesis that peristalsis is primarily a function of the intrinsic neuromuscular organization of the smooth muscle esophagus.
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683
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Shirazi S, Schulze-Delrieu K, Custer-Hagen T, Brown CK, Ren J. Motility changes in opossum esophagus from experimental esophagitis. Dig Dis Sci 1989; 34:1668-76. [PMID: 2582979 DOI: 10.1007/bf01540042] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We assessed how acute inflammation affects the contractile activity of the esophageal body. Two models of esophagitis were used: nine opossums had an esophageal perfusion of 100 meq hydrochloric acid for 2 hr and were studied at 24 hr. Ten had the perfusion for 4 h and their esophagitis were studied in vitro after 72 hr. Comparisons were made in all instances to animals who had esophageal saline perfusion for identical periods. All acid-perfused animals developed gross and histologic evidence of mucosal inflammation; in three animals, inflammatory changes extended into the submucosa and the muscularis propria. Manometric recordings in the acid-perfused animals revealed esophageal shortening, frequent failure of primary peristalsis and frequent occurrence of spontaneous contractions. Recordings of isometric tension of muscle in vitro revealed spontaneous contractions in strips from the mucosa and from the circular and from the longitudinal muscle. The amplitude of contractions in response to electrical stimulation was decreased, but the duration of contractions was increased largely because of a prolonged recovery phase. These changes in mechanical response occurred with stimulus parameters directed at both the muscle and the intrinsic nerves. We conclude that esophageal inflammation can lead to an increased irritability and decreased stimulus response of the smooth muscle of the esophagus even where it is not directly involved in an inflammatory response. These changes correspond to the functional abnormalities of the esophagus seen in patients with reflux esophagitis.
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684
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Abstract
Stimulation of the intrinsic nerves of the esophageal body leads to a twitch of the circular muscle after the end of the stimulation (the esophageal off-response), and the twitch spreads in the distal direction because of a latency gradient in the onset of the off-response between the proximal and the distal esophagus. We investigated the possibility that local input can modulate the basic off-response through intrinsic mechanisms and make it resemble more closely the sequential ring contractions that move boluses in the esophagus of intact animals (esophageal peristalsis). The esophagus up to the aortic arch and down to the gastroesophageal junction was removed from opossums and suspended in an organ bath containing 2 liters of Krebs solution at 36 degrees C. The mechanical activity of the esophagus was recorded by force transducers on the serosal surface of the esophagus 2, 4, and 6 cm above the LES. The intramural nerves of the proximal esophagus were stimulated by electrical pulses with and without distension of the esophagus by inflation of a luminal balloon. Balloon distension increased the latency of the off-response in the distal esophagus, thereby reducing the velocity at which the circular muscle contraction spread through the esophagus. In addition, balloon distension increased the amplitude and the duration of the esophageal circular muscle contraction (both off- and on-responses), and decreased the amplitude of the longitudinal muscle contraction (duration response) and LES response (relaxation response). Similar changes in the esophageal contraction responses were produced by radial stretch of an open preparation of the esophagus from which the mucosa had been removed.(ABSTRACT TRUNCATED AT 250 WORDS)
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685
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Schulze-Delrieu K, Percy WH, Ren J, Shirazi SS, Von Derau K. Evidence for inhibition of opossum LES through intrinsic gastric nerves. THE AMERICAN JOURNAL OF PHYSIOLOGY 1989; 256:G198-205. [PMID: 2563200 DOI: 10.1152/ajpgi.1989.256.1.g198] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We have studied the mechanical responses of the isolated opossum gastroesophageal junction to a variety of stimuli. Lower esophageal sphincter (LES) relaxations were readily produced by gastric stretch and by electrical stimulation of the intramural gastric nerves. Gastric stimulation also led in 60% of stimuli to a contraction of circular muscle (the off response) in the distal esophagus, but in less than 15% of stimuli to a contraction of longitudinal esophageal muscle (the duration response). Mechanical or electrical stimulation of the esophagus led to a mechanical response of the stomach (relaxation, contraction, or both) in 76% of stimuli. The LES relaxation produced by esophageal stimulation was not as long as that produced by gastric stimulation. Direct electrical stimulation of the esophageal or gastric muscle produced a ring contraction that spread readily across the gastroesophageal junction but did not produce a relaxation of the LES or a contraction of the longitudinal esophageal muscle. Thus intramural nervous pathways can coordinate the mechanical activity of the esophagus, LES, and stomach. LES relaxations may occur as part of intrinsic reflexes that mediate gastric accommodation to volume.
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686
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Ren J, Wang ZG. Pharmacological research on the effect of licorice. J TRADIT CHIN MED 1988; 8:307-9. [PMID: 3073265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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687
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Ren J. [Ultrastructural study on the tracheal epithelium of hamsters induced by chemical carcinogen]. ZHONGHUA BING LI XUE ZA ZHI = CHINESE JOURNAL OF PATHOLOGY 1987; 16:285-7, 51. [PMID: 2968166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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688
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Ren J, Ma TX, Sun ZL, Wang Q, Tao HZ. Echocardiography in chronic cor pulmonale. Its value in early diagnosis compared with roentgenography and electrocardiography. Chin Med J (Engl) 1982; 95:203-8. [PMID: 6807628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
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