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Ribeiro U, Safatle-Ribeiro AV, Habr-Gama A, Gama-Rodrigues JJ, Sohn J, Reynolds JC. Effect of Chagas' disease on nitric oxide-containing neurons in severely affected and unaffected intestine. Dis Colon Rectum 1998; 41:1411-7. [PMID: 9823808 DOI: 10.1007/bf02237058] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
PURPOSE The pathophysiology of Chagas' disease is incompletely understood. Neuronal nitric oxide has been cited as a candidate neurotransmitter responsible for relaxation of the internal anal sphincter. Neuronal nicotinamide adenine dinucleotide phosphate diaphorase can be used as a marker for neuronal nitric oxide synthase. This study was designed to examine the alterations of the nitric oxide-containing neurons in the enteric nervous system of the colon of patients who underwent resections for advanced megacolon and to compare these specimens with small-bowel specimens from the same patients and with specimens from control subjects. METHODS Specimens from resected rectum and extramucosal small-bowel biopsy specimens from 11 patients with Chagas megacolon but no apparent small-bowel clinical involvement were compared with the uninvolved colon and jejunum of 10 control patients with colon cancer. Tissues were fixed in Zamboni solution and evaluated by histochemistry for nicotinamide adenine dinucleotide phosphate diaphorase-containing neurons. Reactivity was evaluated on a 0 to 4 scale in the longitudinal muscle, myenteric plexus, circular muscle, submucosal plexus, and mucosa. RESULTS Specimens from control patients showed well-stained myenteric and submucosal neurons and an abundant network of terminal nerve fibers in the muscle layers. Chagasic specimens had decreased staining in all layers of the gut. Overall there was a statistically significant decrease in nicotinamide adenine dinucleotide phosphate diaphorase-containing neurons. Biopsy specimens from clinically uninvolved small bowel of patients with Chagas' disease also showed decreased reactivity, but to a lesser degree. CONCLUSIONS Nicotinamide adenine dinucleotide phosphate diaphorase activity is decreased in patients with advanced megacolon. The alterations are more relevant in the myenteric plexus and the circular muscle. Reactivity is also diminished in the clinically uninvolved small bowel, but to a lesser extent.
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Kim SS, Utsunomiya H, Koski JA, Wu BM, Cima MJ, Sohn J, Mukai K, Griffith LG, Vacanti JP. Survival and function of hepatocytes on a novel three-dimensional synthetic biodegradable polymer scaffold with an intrinsic network of channels. Ann Surg 1998; 228:8-13. [PMID: 9671060 PMCID: PMC1191421 DOI: 10.1097/00000658-199807000-00002] [Citation(s) in RCA: 354] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE To evaluate the survival and function of hepatocytes (HCs) on a novel three-dimensional (3D) synthetic biodegradable polymer scaffold with an intrinsic network of interconnected channels under continuous flow conditions. SUMMARY BACKGROUND DATA The authors' laboratory has investigated HC transplantation using 3D biodegradable polymers as scaffolding as an alternative approach to treatment of end-stage liver disease. Previous studies have demonstrated survival of HCs transplanted on polymer discs in peripheral tissue sites and partial correction of single enzyme liver defects. One of the major limitations has been the insufficient survival of an adequate mass of transplanted cells; this is thought to be caused by inadequate oxygen diffusion. METHODS HCs and nonparenchymal liver cells from Lewis rats were seeded onto 3D biodegradable polymer scaffolds. Microporous 3D polymers were created using 3D printing on copolymers of polylactide-coglycolide. The cell/polymer constructs were placed in static culture or continuous flow conditions. The devices were retrieved after 2 days and examined by scanning electron microscopy and histology. Culture medium was analyzed for albumin by enzyme-linked immunosorbent assay (ELISA). Differences in culture parameters including pH, PCO2, PO2, glucose, lactate, and HCO3 were examined. RESULTS Scanning electron microscopy revealed successful attachment of HCs on the 3D polymer in both static and flow conditions. Histology demonstrated viable HCs in both conditions. ELISA demonstrated a significantly higher mean concentration of albumin in flow conditions than in static conditions. Culture parameter analysis revealed a significantly higher PO2 and glucose level, and a more physiologic pH in flow conditions than in static conditions. CONCLUSIONS HCs cocultured with nonparenchymal cells can attach to and survive on the 3D polymer scaffolds in both static and flow conditions in the size and configuration used in this study. Flow conditions may provide a more conducive environment for HC metabolism and albumin synthesis than static conditions. The authors hypothesize that flow through directed channels will be necessary for the transfer of large masses of cells when implantation studies are initiated.
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Sohn J, Lee CH, Chung DJ, Park SH, Kim I, Hwang WI. Effect of petroleum ether extract of Panax ginseng roots on proliferation and cell cycle progression of human renal cell carcinoma cells. Exp Mol Med 1998; 30:47-51. [PMID: 9873822 DOI: 10.1038/emm.1998.7] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Panax ginseng roots have long been used as a medicinal herb in oriental countries. We have investigated anti-proliferative effects of lipid soluble Panax ginseng components on human renal cancer cell lines. Petroleum ether extract of Panax ginseng roots (GX-PE) or its partially purified preparation (7:3 GX) was added to cultures of three human renal cell carcinoma (RCC) cell lines, A498, Caki-1, and CURC II. Proliferation of RCC cells was estimated by a [3H]thymidine incorporation assay and cell cycle distribution was analyzed by flow cytometry. GX-PE, 7:3 GX, panaxydol and panaxynol inhibited proliferation of all three RCC cell lines in a dose dependent manner in vitro with an order of potency, 7:3 GX > panaxydol > panaxynol = GX-PE. Additive effect of interleukin 4 was also demonstrated, most prominently in Caki-1 which responded poorly to GX-PE alone. Analysis of cell cycle in CURC II and Caki-1 treated with GX-PE demonstrated increase in G1 phase population and corresponding decrease in S phase population. The present study demonstrated that proliferation of human RCC cell lines were inhibited by lipid soluble components of Panax ginseng roots by blocking cell cycle progression at G1 to S phase transition.
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Shlansky-Goldberg R, Cope C, McGuckin J, Jacobs J, Sohn J, Holland T, Naji A, Brayman K. Percutaneous management of a bladder-drained pancreas transplant pseudocyst by a transcystic approach. Transplantation 1997; 64:1568-71. [PMID: 9415557 DOI: 10.1097/00007890-199712150-00010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
BACKGROUND We describe a 35-year-old male type 1 diabetic who underwent a cadaveric combined kidney-bladder-drained pancreas transplant with a duodenocystostomy for exocrine drainage who developed a large pelvic pseudocyst associated with a dilated pancreatic duct and an elevated serum amylase level. METHODS Due to the risk of surgical revision and the possibility of creating a cutaneous fistula with conventional percutaneous drainage, a pseudocyst-to-bladder drainage was performed. After the procedure, the catheter was capped to allow drainage of the pancreatic secretions into the bladder. RESULTS After drainage, the patient's serum amylase and lipase normalized along with resolution of the pseudocyst. The tube was removed after 19 weeks with no evidence of a recurrent pseudocyst and a normal serum amylase level. CONCLUSION The percutaneous pseudocyst-cystostomy obviated the need for surgical revision of the exocrine gland drainage and thus eliminated the morbidity and the potential risk of graft loss associated with such surgery.
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Sohn C, Beldermann F, Frey H, Reinhardt S, Sohn J, Bastert G. [Diagnosis of blood flow in breast tumors with increased blood pressure. New possibility in tumor field diagnosis]. Radiologe 1997; 37:643-50. [PMID: 9411482 DOI: 10.1007/s001170050266] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
On the assumption that the architecture of blood vessels of malignant tumors, formed by neoangiogenesis, shows characteristics that are different from those of blood vessels of benign tumors or physiological findings, we have tried in the present study to investigate the behavior of these different vessels under increased blood pressure. Using a special stand, the same sonographic section could be stably maintained during an examination time of approx. 4 minutes. Using a new computer program, the color pixels of the employed Angio color technique were quantified and recorded as a function of the measured blood pressure. To increase blood pressure, the patient had to press a hand grip, which practically always caused a systolic blood pressure elevation of more than 15-20 mmHg. Seventy patients with sonographically detected breast tumors were examined; 54 (14 benign and 40 malignant tumors) could be included in the evaluation. We found four typical types of curves: Curve type 1 is associated with an instantaneous increase in blood flow with increased blood pressure, followed by a drop in the blood pressure, with a slow decrease in blood flow as the blood pressure drops (with 29 malignant and 3 benign tumors). Curve type 2 shows a continuous increase in blood flow-though somewhat delayed with respect to the rise in blood pressure-which is also observed when the blood pressure drops (exclusively benign tumors). In curve type 3, maximum blood flow is reached after the blood pressure maximum, and then the blood flow decreases (1 benign and 3 malignant tumors). Curve type 4 features decreased blood flow in spite of increased blood pressure (3 benign and 5 malignant tumors). The described quantification method, in combination with the stand, permits for the first time analysis of a tumor under increased blood pressure as to its blood flow behavior over time in an examination using a challenge test. Here one can find two distinctive curve types (types 1 and 2) that correlate mostly with malignant (type 1) or benign (type 2) breast tumors. Should this tendency be substantiated by additional large-scale studies, it would seem that a new ultrasonic possibility for differential diagnosis has been found.
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MESH Headings
- Adult
- Aged
- Blood Flow Velocity/physiology
- Blood Pressure/physiology
- Breast Neoplasms/blood supply
- Breast Neoplasms/diagnostic imaging
- Breast Neoplasms/pathology
- Carcinoma, Ductal, Breast/blood supply
- Carcinoma, Ductal, Breast/diagnostic imaging
- Carcinoma, Ductal, Breast/pathology
- Carcinoma, Squamous Cell/blood supply
- Carcinoma, Squamous Cell/diagnostic imaging
- Carcinoma, Squamous Cell/pathology
- Computer Systems
- Diagnosis, Differential
- Female
- Fibrocystic Breast Disease/diagnostic imaging
- Fibrocystic Breast Disease/pathology
- Hand Strength/physiology
- Humans
- Image Processing, Computer-Assisted/instrumentation
- Middle Aged
- Neoplasm Staging
- Neovascularization, Pathologic/diagnostic imaging
- Neovascularization, Pathologic/pathology
- Precancerous Conditions/blood supply
- Precancerous Conditions/diagnostic imaging
- Precancerous Conditions/pathology
- Regional Blood Flow/physiology
- Software
- Ultrasonography, Doppler, Color/instrumentation
- Ultrasonography, Mammary/instrumentation
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Cheon J, Chung DJ, Kim JJ, Koh SK, Sohn J. Inhibitory effects of interleukin-4 on human renal cell carcinoma cells in vitro: in combination with interferon-alpha, tumor necrosis factor-alpha or interleukin-2. Int J Urol 1996; 3:196-201. [PMID: 8776617 DOI: 10.1111/j.1442-2042.1996.tb00516.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
BACKGROUND Immune cytokines have been shown to play important roles in regulating the growth of neoplastic cells, as well as the function of immune cells. The present study assessed the effects of interleukin (IL)-4 alone, and in combination with recombinant interferon (IFN)-alpha 2b, or with IL-2, or with tumor necrosis factor (TNF)-alpha on the in vitro proliferation of human renal cell carcinoma (RCC) cell-lines. METHODS Growth-inhibitory effects of IL-4 alone, and in combination with other cytokines, on three human RCC cell-lines, Caki-1, CURC-II, and A-498, were measured by the [3H]thymidine incorporation assay. RESULTS IL-4 inhibited proliferation of all three human RCC cell-lines (P < 0.001). The maximum growth inhibition of RCC cell-lines by IL-4 alone was observed at the concentration of 1 to 3 ng/mL, depending on the cell-line. Antihuman IL-4 antisera was able to reverse the growth-inhibitory effects of IL-4 on Caki-1 in a dose-dependent manner, proving that the growth inhibition was mediated by IL-4 itself. When other cytokines were added in combination with IL-4, only IFN-alpha 2b resulted in significant additional growth inhibition (P < 0.005). However, when the proliferation was compared to that of RCC cells that were not treated with any cytokine, all combinations produced marked growth inhibition. CONCLUSION Our data suggest that IL-4 alone, or in combination with IFN-alpha 2b, can be used to develop new strategies for treatment of human RCC.
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Sohn J, Levine MS, Furth EE, Laufer I, Rubesin SE, Herlinger H, Lichtenstein GR. Helicobacter pylori gastritis: radiographic findings. Radiology 1995; 195:763-7. [PMID: 7754008 DOI: 10.1148/radiology.195.3.7754008] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
PURPOSE To determine whether there are useful radiographic criteria for diagnosing Helicobacter pylori. MATERIALS AND METHODS Radiographs from double-contrast upper gastrointestinal examinations of 88 patients with H pylori and 41 control subjects were blindly reviewed. The results were analyzed by means of receiver operating characteristic (ROC) curves. RESULTS Thickened gastric folds were detected in 39 patients with H pylori (44%) and nine control subjects (22%). The area under the ROC curve was 0.62 (standard deviation [SD] = 0.05, P < .01). Among the 48 subjects with thickened gastric folds, polypoid gastritis with thickened, lobulated folds was detected in 24 patients with H pylori (62%) and four control subjects (44%). The area under the ROC curve was 0.59 (SD = 0.05, P < .01). No substantial differences were observed in the frequencies of gastric ulcers, erosive gastritis, gastric narrowing, duodenal ulcers, duodenitis, and duodenal narrowing in patients with and without H pylori. CONCLUSION The presence of thickened gastric folds was the best radiographic criterion for differentiating subjects with from those without H pylori.
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Sigurdardottir D, Sohn J, Kass J, Selsing E. Regulatory regions 3' of the immunoglobulin heavy chain intronic enhancer differentially affect expression of a heavy chain transgene in resting and activated B cells. THE JOURNAL OF IMMUNOLOGY 1995. [DOI: 10.4049/jimmunol.154.5.2217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
We have compared the expression patterns of three Ig heavy chain transgenes. The three constructs differ only by deletion of J-C intron sequences located downstream of the Emu enhancer region. When stably transfected into a myeloma cell line, all three constructs are expressed at comparable levels. However, transgenic mice carrying each construct show dramatic differences in transgene expression. Our results indicate that, in addition to the Emu enhancer, at least two regions, RegA and RegS, within the J-C intron influence transgene expression. RegA, located directly downstream of the core Emu enhancer, is involved in up-regulation of transgene expression after LPS activation of splenocytes. RegS, located within or downstream of the Smu switch region, is important for normal levels of transgene expression in splenocytes of heavy chain transgenic mice.
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Sigurdardottir D, Sohn J, Kass J, Selsing E. Regulatory regions 3' of the immunoglobulin heavy chain intronic enhancer differentially affect expression of a heavy chain transgene in resting and activated B cells. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 1995; 154:2217-25. [PMID: 7868895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
We have compared the expression patterns of three Ig heavy chain transgenes. The three constructs differ only by deletion of J-C intron sequences located downstream of the Emu enhancer region. When stably transfected into a myeloma cell line, all three constructs are expressed at comparable levels. However, transgenic mice carrying each construct show dramatic differences in transgene expression. Our results indicate that, in addition to the Emu enhancer, at least two regions, RegA and RegS, within the J-C intron influence transgene expression. RegA, located directly downstream of the core Emu enhancer, is involved in up-regulation of transgene expression after LPS activation of splenocytes. RegS, located within or downstream of the Smu switch region, is important for normal levels of transgene expression in splenocytes of heavy chain transgenic mice.
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185
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Broniatowski M, Sohn J, Kayali H, Bold EL, Miller FR, Jacobs GB, Tucker HM. Artificial reflex arc: a potential solution for chronic aspiration. III: Stimulation of implanted cervical skin as a functional graft triggering glottic closure in the canine. Laryngoscope 1994; 104:1259-63. [PMID: 7934597 DOI: 10.1288/00005537-199410000-00013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Stroke often impairs the ability of the vocal cords to close during deglutition, resulting in aspiration. The current study is a further advance on the application of the concept of an artificial reflex arc during swallowing. The second and third cervical branches were bilaterally isolated in four dogs and baseline sensory nerve traffic was detected via tripolar perineural electrodes. Cervical skin pressure-induced suprathreshold signals were used to trigger vocal cord contraction via bipolar electrodes passed around the recurrent laryngeal nerves. Skin subtended by the cervical nerves was implanted over the lateral aspect of the pyriform sinuses for 1 week. After reexploration, glottic closure was verified on videotape as surges in sensory nerve traffic were induced by mechanical stimulation of the pharynx. The possibility of artifactual stimulation was ruled out by lack of electrode motion during pharyngeal stimulation, spontaneous firing in the sensory nerve during light anesthesia, and sensory frequency differing from ambient 60-Hz noise. This article introduces the concept of autogenous functional graft as a basis for afferent information in electronic systems for dynamic rehabilitation of swallowing disorders.
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186
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Kim YJ, Sohn J, Tchah H, Lee CO. Photoastigmatic refractive keratectomy in 168 eyes: six-month results. J Cataract Refract Surg 1994; 20:387-91. [PMID: 7932126 DOI: 10.1016/s0886-3350(13)80172-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Using a 193 nm excimer laser, we performed elliptical astigmatic and spherical corneal ablation on 168 eyes with compound myopic astigmatism and analyzed the three- and six-month postoperative results. Mean preoperative astigmatism was 1.51 +/- 0.81 diopters (D). Mean three- and six-month postoperative astigmatism was 0.70 +/- 0.58 D and 0.67 +/- 0.60 D, respectively. Six months after surgery, eyes with less than 1.00 D preoperative astigmatism improved 4.8%. The improvement was 53.5% and 59.1% for eyes with a preoperative astigmatism of 1.00 D to 2.00 D and above 3.00 D, respectively. Overall, astigmatism improved 55.6%. There was a wide distribution from overcorrection to undercorrection. Astigmatism six months after surgery was within 10 degrees of the preoperative axis in 46.1% of eyes.
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187
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Sohn J, Gerstein RM, Hsieh CL, Lemer M, Selsing E. Somatic hypermutation of an immunoglobulin mu heavy chain transgene. J Exp Med 1993; 177:493-504. [PMID: 8426117 PMCID: PMC2190889 DOI: 10.1084/jem.177.2.493] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
We have analyzed somatic hypermutation of an immunoglobulin (Ig) heavy chain transgene. Hybridomas expressing the transgene were produced from immunized transgenic mice and transgene copies were sequenced to assay for mutation. In two IgM-producing hybridomas, as well as in several IgG-producing hybridomas, mutations were found in the VDJ region of the transgene. In the IgM-producing hybridomas, both mutated and unmutated transgene copies were present and expressed as mRNA. Several mutated transgene copies were present in a single cell and these showed different patterns of mutation. Two IgG-producing hybridomas isolated from a single animal also showed a hierarchical pattern of mutation indicating that transgene mutations can accumulate during B cell proliferation, similar to the mutational process for endogenous antibody genes. Among hybridomas that expressed both IgG and IgM molecules derived from the transgene, the isotype-switched gamma transgene copy exhibited a higher level of mutation than the mu transgene copies. Our results indicate that the 15-kb ARSmu transgene contains all the sequence information required to target the Ig-specific hypermutational machinery, and raise the possibility that sequences associated with the endogenous CH locus might enhance somatic mutation.
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188
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Koppelman MC, Greenwood V, Sohn J, Deuster P. Zinc does not acutely suppress prolactin in normal or hyperprolactinemic women. J Clin Endocrinol Metab 1989; 68:215-8. [PMID: 2491863 DOI: 10.1210/jcem-68-1-215] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
In rat pituitary cells in vitro physiological zinc concentrations selectively inhibit basal and stimulated PRL release. This study was done to investigate the serum PRL response to an oral zinc challenge in vivo. Eight hyperprolactinemic [mean serum PRL, 76.0 +/- 43.8 (+/- SD) micrograms/L] and 10 normal (mean serum PRL, 9.6 +/- 2.8 micrograms/L) women were studied. All women had normal thyroid, renal, and hepatic function, and none was taking any medications. Each was studied twice, after both oral zinc (50 mg) and placebo, given in random order. Blood was withdrawn every 15 min from 30 min before to 210 min after zinc or placebo administration; TRH (500 micrograms) was given iv at 180 min. Both hyperprolactinemic and normal women absorbed the zinc well, achieving similar maximal plasma zinc levels [hyperprolactinemic women, 39.5 +/- 6.9 (+/- SD) mumol/L; normal women, 33.3 +/- 7.0; P less than 0.001 vs. placebo]. When 2 women who became symptomatic after zinc administration were excluded, there were no significant differences in basal or TRH-stimulated serum PRL levels after zinc vs. placebo. These findings indicate that zinc is not involved in the acute in vivo regulation of PRL secretion in humans.
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189
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Pan JX, Lechan RM, Lin HD, Sohn J, Reichlin S, Jackson IM. Multiple forms of human pancreatic growth hormone releasing factor-like immunoreactivity in teleost brain and pituitary. Endocrinology 1985; 116:1663-5. [PMID: 3918857 DOI: 10.1210/endo-116-4-1663] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Two anatomically distinct neuronal GRF systems in the brain-pituitary of the teleost codfish (Gadus morhua), immunohistochemically localized by use of antisera directed against hpGRF1-44NH2 and hpGRF1-40OH are described. Chromatographic analysis additionally revealed the presence of three molecular variants of immunoreactive hpGRF1-44NH2, two of which differ from the authentic human material. However, all three forms released GH from rat pituitary cells in dispersed culture. These findings indicate that hpGRF is highly conserved in nature and suggest that peptides closely related to this human hypothalamic releasing hormone regulate the teleost pituitary.
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190
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Barnett FH, Sohn J, Reichlin S, Jackson IM. Three luteinizing hormone-releasing hormone like substances in a teleost fish brain: none identical with the mammalian LH-RH decapeptide. Biochem Biophys Res Commun 1982; 105:209-16. [PMID: 7046742 DOI: 10.1016/s0006-291x(82)80032-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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191
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Schönhöfer PS, Sohn J, Peters HD, Dinnendahl V. Effects of sodium salicylate and acetylsalicylic acid on the lipolytic system of fat cells. Biochem Pharmacol 1973; 22:629-37. [PMID: 4348116 DOI: 10.1016/0006-2952(73)90377-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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192
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Honig JM, Van Zandt LL, Reed TB, Sohn J. Negative-Magnetoresistance Effects inTi2O3. ACTA ACUST UNITED AC 1969. [DOI: 10.1103/physrev.182.863] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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