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Li H, DaSilva NA, Liu W, Xu J, Dombi GW, Dain JA, Li D, Chamcheu JC, Seeram NP, Ma H. Thymocid ®, a Standardized Black Cumin ( Nigella sativa) Seed Extract, Modulates Collagen Cross-Linking, Collagenase and Elastase Activities, and Melanogenesis in Murine B16F10 Melanoma Cells. Nutrients 2020; 12:E2146. [PMID: 32707654 PMCID: PMC7400895 DOI: 10.3390/nu12072146] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Revised: 07/08/2020] [Accepted: 07/16/2020] [Indexed: 12/17/2022] Open
Abstract
Black cumin (Nigella sativa) seed extract has been shown to improve dermatological conditions, yet its beneficial effects for skin are not fully elucidated. Herein, Thymocid®, a chemically standardized black cumin seed extract, was investigated for its cosmeceutical potential including anti-aging properties associated with modulation of glycation, collagen cross-linking, and collagenase and elastase activities, as well as antimelanogenic effect in murine melanoma B16F10 cells. Thymocid® (50, 100, and 300 µg/mL) inhibited the formation of advanced glycation end-products (by 16.7-70.7%), collagen cross-linking (by 45.1-93.3%), collagenase activity (by 10.4-92.4%), and elastases activities (type I and III by 25.3-75.4% and 36.0-91.1%, respectively). In addition, Thymocid® (2.5-20 µg/mL) decreased melanin content in B16F10 cells by 42.5-61.6% and reduced cellular tyrosinase activity by 20.9% (at 20 µg/mL). Furthermore, Thymocid® (20 µg/mL for 72 h) markedly suppressed the mRNA expression levels of melanogenesis-related genes including microphthalmia-associated transcription factor (MITF), tyrosinase-related protein 1 (TYRP1), and TYRP2 to 78.9%, 0.3%, and 0.2%, respectively. Thymocid® (10 µg/mL) also suppressed the protein expression levels of MITF (by 15.2%) and TYRP1 (by 97.7%). Findings from this study support the anti-aging and antimelanogenic potential of Thymocid® as a bioactive cosmeceutical ingredient for skin care products.
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Affiliation(s)
- Huifang Li
- School of Biotechnology and Health Sciences, Wuyi University, International Healthcare Innovation Institute (Jiangmen), Jiangmen 529020, China; (H.L.); (D.L.)
- Bioactive Botanical Research Laboratory, Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI 02881, USA; (N.A.D.); (J.X.); (N.P.S.)
| | - Nicholas A. DaSilva
- Bioactive Botanical Research Laboratory, Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI 02881, USA; (N.A.D.); (J.X.); (N.P.S.)
| | - Weixi Liu
- Department of Chemistry, University of Rhode Island, Kingston, RI 02881, USA; (W.L.); (G.W.D.); (J.A.D.)
| | - Jialin Xu
- Bioactive Botanical Research Laboratory, Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI 02881, USA; (N.A.D.); (J.X.); (N.P.S.)
- Institute of Biochemistry and Molecular Biology, College of Life and Health Sciences, Northeastern University, Shenyang 110819, China
| | - George W. Dombi
- Department of Chemistry, University of Rhode Island, Kingston, RI 02881, USA; (W.L.); (G.W.D.); (J.A.D.)
| | - Joel A. Dain
- Department of Chemistry, University of Rhode Island, Kingston, RI 02881, USA; (W.L.); (G.W.D.); (J.A.D.)
| | - Dongli Li
- School of Biotechnology and Health Sciences, Wuyi University, International Healthcare Innovation Institute (Jiangmen), Jiangmen 529020, China; (H.L.); (D.L.)
| | - Jean Christopher Chamcheu
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana at Monroe, Monroe, LA 71209, USA;
| | - Navindra P. Seeram
- Bioactive Botanical Research Laboratory, Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI 02881, USA; (N.A.D.); (J.X.); (N.P.S.)
| | - Hang Ma
- School of Biotechnology and Health Sciences, Wuyi University, International Healthcare Innovation Institute (Jiangmen), Jiangmen 529020, China; (H.L.); (D.L.)
- Bioactive Botanical Research Laboratory, Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI 02881, USA; (N.A.D.); (J.X.); (N.P.S.)
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Cai A, Liu W, Ma H, Dombi GW, Dain JA, Seeram NP. Pomegranate phenolics inhibit type I collagen cross‐linking induced by glycative stress. FASEB J 2018. [DOI: 10.1096/fasebj.2018.32.1_supplement.656.35] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ang Cai
- Department of Biomedical and Pharmaceutical SciencesCollege of PharmacyUniversity of Rhode IslandKingstonRI
- Department of ChemistryUniversity of Rhode IslandKingstonRI
| | - Weixi Liu
- Department of ChemistryUniversity of Rhode IslandKingstonRI
| | - Hang Ma
- Bioactive Botanical Research LaboratoryDepartment of Biomedical and Pharmaceutical SciencesCollege of PharmacyUniversity of Rhode IslandKingstonRI
| | | | - Joel A. Dain
- Department of ChemistryUniversity of Rhode IslandKingstonRI
| | - Navindra P. Seeram
- Bioactive Botanical Research LaboratoryDepartment of Biomedical and Pharmaceutical SciencesCollege of PharmacyUniversity of Rhode IslandKingstonRI
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Dombi GW, Purohit K, Martin LM, Yang SC. Collagen gel formation in the presence of a carbon nanobrush. J Mater Sci Mater Med 2015; 26:5356. [PMID: 25578709 DOI: 10.1007/s10856-014-5356-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Accepted: 08/06/2014] [Indexed: 06/04/2023]
Abstract
Type I, bovine skin collagen was allowed to gel in the presence of various concentrations of a carbon nanotube material covered with a polystyrene/polyaniline copolymer, called a carbon nanobrush (CNB). The rate of collagen gelation was enhanced by the presence of the CNB in a dose dependent manner. The extent of collagen gelation was due to the concentration of collagen and not the amount of CNB. Collagen D-periodicity, and average fibril diameter were unchanged by the CNB material as seen in transmission electron micrographs. Gel tensile strength was reduced by the presence of the CNB in a dose related manner. The collagen-CNB mixture may have a role in the repair and reconstruction of wounds or degenerated connective tissue.
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Affiliation(s)
- George W Dombi
- Department of Chemistry, University of Rhode Island, Kingston, RI, 02881, USA,
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Marks WH, Yang SC, Dombi GW, Bhatia SK. Carbon Nanobrush-Containing Poloxamer Hydrogel Composites for Tissue Regeneration. J Long Term Eff Med Implants 2012; 22:229-36. [DOI: 10.1615/jlongtermeffmedimplants.2013006208] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Seneviratne C, Dombi GW, Liu W, Dain JA. In vitro glycation of human serum albumin by dihydroxyacetone and dihydroxyacetone phosphate. Biochem Biophys Res Commun 2011; 417:817-23. [PMID: 22198436 DOI: 10.1016/j.bbrc.2011.12.043] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Accepted: 12/09/2011] [Indexed: 02/09/2023]
Abstract
Amino groups in proteins can non-enzymatically react with reducing sugars to generate a structurally diverse group of compounds referred to as advanced glycation end products (AGEs). The in vivo formation of AGEs contributes to some of the complications of diabetes including atherosclerosis, cataract formation, and renal failure. The formation of AGEs is dependent on both sugar and protein concentrations. Increases in temperature, pH, and exposure time of sugars to the proteins also play a significant role in the rate of AGE formation. This study focuses on the use of a combination of analytical techniques to study the in vitro AGE formation of HSA with dihydroxyacetone phosphate (DHAP), a ketose generated during glycolysis, and its dephosphorylated analog, dihydroxy acetone (DHA), commonly used as a browning reagent in skin tanning preparations. The extent of AGE formation was affected by DHAP and DHA concentrations and by the duration of HSA exposure to these glycating agents. Increases in temperature and pH sped the glycation process and enhanced the formation of the AGEs of HSA. MALDI-TOF mass spectroscopic data provided a reliable result to evaluate the extent of the AGE formation.
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Seneviratne C, Dombi GW, Liu W, Dain JA. The in vitro glycation of human serum albumin in the presence of Zn(II). J Inorg Biochem 2011; 105:1548-54. [PMID: 22071077 DOI: 10.1016/j.jinorgbio.2011.09.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2011] [Revised: 08/30/2011] [Accepted: 09/01/2011] [Indexed: 12/20/2022]
Abstract
Amino groups of human serum albumin (HSA) can react non-enzymatically with carbonyl groups of reducing sugars to form advanced glycation end products (AGEs). These AGEs contribute to many of the chronic complications of diabetes including atherosclerosis, cataract formation and renal failure. The current study focused on in vitro non-enzymatic reactivity of glyceraldehyde (GA) and methylglyoxal (MG) with HSA and evaluated the rate and extent of AGE formation in the presence of varied concentrations of Zn(II). At normal physiological conditions, GA and MG readily react with HSA. The presence of Zn(II) in HSA-GA or HSA-MG incubation mixtures reduced AGE formation. This finding was confirmed by UV and fluorescence spectrometry, HPLC techniques, and matrix assisted laser desorption ionization mass spectrometry (MALDI-TOF). HPLC studies revealed decreased adduct formation of the glycated protein in the presence of Zn(II). The inhibition of AGE formation was intense at elevated Zn(II) concentrations. The results of this study suggest that Zn(II) may prove to be a potent agent in reducing AGE formation.
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Shridhar R, Dombi GW, Finkelstein SE, Meredith KL, Hoffe SE. Improved survival in patients with lymph node-positive gastric cancer who received preoperative radiation: an analysis of the Surveillance, Epidemiology, and End Results database. Cancer 2011; 117:3908-16. [PMID: 21365627 DOI: 10.1002/cncr.25995] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2010] [Revised: 12/30/2010] [Accepted: 01/06/2011] [Indexed: 01/12/2023]
Abstract
BACKGROUND Several trials have been conducted to determine the feasibility of preoperative radiotherapy (RT) for gastric cancer. However, the absolute benefit from radiotherapy remains to be defined. In this study, the authors examined the use of preoperative RT (Pre-RT) and postoperative RT (PORT) in patients with gastric cancer from the Surveillance, Epidemiology, and End Results (SEER) database. METHODS The overall survival of patients who had nonmetastatic, resected gastric cancer between 2000 and 2006 was analyzed from the SEER database. Kaplan-Meier survival curves comparing Pre-RT, PORT, and no RT (No-RT) were analyzed using the log-rank test. A multivariate analysis (MVA) was conducted using Cox proportional hazards regression. RESULTS The authors identified 10,251 patients. There was no survival benefit for patients who received Pre-RT or PORT compared with No-RT patients for the entire cohort. Conversely, among lymph node-positive patients, there was a significant survival benefit from both Pre-RT and PORT compared with No-RT (log-rank test: PORT, P < .0001; Pre-RT, P = .0261). The median survival and 5-year overall survival among lymph node-positive patients were 22 months and 24%, respectively, for Pre-RT;29 months and 34%, respectively, for PORT; and 19 months and 20%, respectively, for No-RT. MVA demonstrated that Pre-RT, PORT, and removing ≥ 15 lymph nodes were independent predictors of improved survival, whereas tumor classification, lymph node status, tumor size, and tumor location were independent predictors of death. CONCLUSIONS The current results supported the use of Pre-RT in select patients with gastric cancer. However, additional trials will be needed to confirm these findings.
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Affiliation(s)
- Ravi Shridhar
- Department of Radiation Oncology, Moffitt Cancer Center, Tampa, Florida, USA.
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Abstract
BACKGROUND The most important factor in predicting survival among women with newly diagnosed breast cancer is the status of the axillary lymph nodes. Although straightforward to define, the impact of micrometastases on survival remains to be completely determined. METHODS A review of data from the Surveillance, Epidemiology, and End Results Program of the National Cancer Institute was performed using 43,921 cases diagnosed from January 1988 through December 2001. Among women with invasive breast carcinomas <or=2 cm undergoing a resection of the primary malignancy and an axillary lymph node dissection, there were 42,197 cases without lymph node metastases and 1724 cases with micrometastases. Survival differences among these 2 groups were evaluated and are reported here. RESULTS Survival at 12 years was modestly affected by the presence of either solitary (5.0%) or multiple lymph nodes (3.6%) with micrometastases when compared with lymph node-negative cases. In subgroup analyses, the decreased survival associated with micrometastases was inconsistent. The most significant survival disadvantage associated with micrometastases was found in cases with Grade 3 carcinomas. CONCLUSIONS The modest and variable impact of micrometastases on long-term survival indicates that micrometastases are an important, but not a dominant, prognostic indicator.
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Abstract
OBJECTIVE To determine the incidence of cancer in patients with scleroderma (systemic sclerosis) and to compare those rates with cancer rates in the local population. METHODS Cancer risk in scleroderma patients in the Detroit metropolitan area was assessed by linking patient identification codes of the Michigan Scleroderma Registry to the Metropolitan Detroit Cancer Surveillance System database. Patients were screened between the years 1973 and 2002, with additional followup to 2004. Standardized incidence ratios (SIRs) were calculated for selected malignancies (lung, liver, colon, breast, cervical, and prostate cancers, and non-Hodgkin's lymphomas), with stratification by sex and race. RESULTS Of 934 patients in the Scleroderma Registry, 538 were included in the study based on tri-county residency (436 females and 102 males). Of these, 45 first malignancies were noted (37 females and 8 males). Lung cancer (10 cases) was found to be the most common cancer in scleroderma patients. However, its incidence was not significantly different from that in the general population of metropolitan Detroit (SIR 1.23). Other types of cancer were examined, and no significant differences were found as compared with the rates in the local population, with 1 exception: black females with scleroderma had significantly higher rates of liver cancer (SIR 45.8). CONCLUSION Contrary to previous studies, this study did not find statistical evidence of an increased incidence of cancer in scleroderma patients, except for liver cancer. One possible reason is the high background rates of certain cancers in the metropolitan Detroit area. It may be necessary to consider local cancer rates when comparing different scleroderma cohorts.
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Fishman LM, Dombi GW, Michaelsen C, Ringel S, Rozbruch J, Rosner B, Weber C. Piriformis syndrome: diagnosis, treatment, and outcome--a 10-year study. Arch Phys Med Rehabil 2002; 83:295-301. [PMID: 11887107 DOI: 10.1053/apmr.2002.30622] [Citation(s) in RCA: 213] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVES To validate an operational definition of piriformis syndrome based on prolongation of the H-reflex with hip flexion, adduction, and internal rotation (FAIR) and to assess efficacy of conservative therapy and surgery to relieve symptoms and reduce disability. DESIGN Before-after trial of cohorts identified by operational definition. SETTING Outpatient departments of 2 hospitals and 4 physicians' offices. Surgery performed at 3 hospitals. PATIENTS Consecutive sample of 918 patients (1014 legs) with follow-up on 733. INTERVENTION Patients with significant (3 standard deviations [SDs]) FAIR tests received injection, physical therapy, and serially reported pain and disability assessments. Forty-three patients (6.47%) had surgery. MAIN OUTCOME MEASURES Likert pain scale. Subjective estimates of disablement in activities of daily living and instrumental activities of daily living. RESULTS At 3 SDs, the FAIR test had sensitivity and specificity of.881 and.832, respectively. Seventy-nine percent (514/655) of FAIR test positive (FTP) patients improved 50% or more from injection and physical therapy at a mean follow-up of 10.2 months. Average improvement was 71.1%. Of 385 FTP patients with disability data, mean disability fell from 35.37% prestudy (SD =.2275) to 12.96% poststudy (SD =.1752), a 62.8% improvement. Twenty-eight surgical FTP patients (68.8%) showed 50% or greater improvement; mean improvement was 68% at a mean follow-up of 16 months. Surgery reduced the mean FAIR test to 1.35 +/- 2.17 months postoperatively. FTP patients generally improved 10% to 15% more than others after conservative treatment. CONCLUSIONS The FAIR test correlates well with a working definition of piriformis syndrome and is a better predictor of successful physical therapy and surgery than the working definition. The FAIR test, coupled with injection and physical therapy and/or surgery, appears to be effective means to diagnose and treat piriformis syndrome.
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Affiliation(s)
- Loren M Fishman
- Department of Physical Medicine and Rehabilitation, New York Flushing Hospital and New York-Presbyterian Medical Center, New York, NY 10028, USA.
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Yu P, Vlahos AL, Dombi GW, Ledgerwood AM, Lucas CE. Inhibition of alpha-smooth muscle actin expression in an in vitro wound healing model by certain antibiotics. J Trauma 1999; 47:130-5. [PMID: 10421198 DOI: 10.1097/00005373-199907000-00026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE This study assesses the effects of antimicrobials on wound healing in an in vitro model of chicken flexor tendons in a collagen gel matrix. Two equidistant tendons were bathed in a culture medium for 28 days as fibroblasts (fb) grew from the tendon ends into the collagen gel and migrated toward each other until gap closure. Five groups of 10 paired tendons each included the control and the study groups, which received oxacillin (Ox), clindamycin (Cl), chloramphenicol (Chl), or tetracycline (Tet) in the culture medium to assess their effects on gap closure rate, fb migration, and myofibroblast alpha-smooth muscle (alpha-SM) actin expression. RESULTS Gap closure, by day 27, was 98.5% in the controls compared with 97%, 92%, 89.5%, 21.75% in the Tet, Cl, Ox, and Chl groups. Chl retarded gap closure (p < 0.05). Fb migration was similar for all groups. In the control and Ox groups, myofibroblast expressed actin at day 5. By day 7, fb cells were clearly visible in the control, Ox, and Cl groups, whereas, only light actin was present in the Chl and Tet groups. Actin band densities for the Cl, Ox, Tet, and Chl groups were 78.4%, 62.5%, 61.7% and 26.1%, respectively, of the control group. CONCLUSION These studies suggest that one reason certain antimicrobials impair wound healing, is due to myofibroblast inhibition of alpha-SM actin.
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Affiliation(s)
- P Yu
- Department of Surgery at Wayne State University, Detroit, Michigan 48201, USA
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Lucas CE, Dombi GW, Crilly RJ, Ledgerwood AM, Yu P, Vlahos A. Neurosurgical trauma call: use of a mathematical simulation program to define manpower needs. J Trauma 1997; 42:818-23; discussion 823-4. [PMID: 9191662 DOI: 10.1097/00005373-199705000-00011] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Resource criteria for trauma centers (TC) mandate a first plus backup neurosurgeon (NS) coverage, an unnecessary expense for TC treating few neurosurgery patients. This report uses a mathematical modeling system to define optimal NS trauma coverage. Random data from 749 patients treated with emergency neurosurgery operations (OR) within 24 hours of admission at 97 TC were used to create a 1-year profile of admission by month, day, and hour, operation times, and operation duration. These data were entered into a simulation program to define the frequency that a patient needing a NS consult would wait beyond 30 minutes because the NS was in the operating room at a trauma center with one, two, or three neurosurgeons on-call. One thousand iterations were done for each sample size of 25 to 300 patients in 25-patient increments. The probability that a patient could not be seen promptly by one NS in a trauma center operating on 25, 50, 75, or 100 patients per year is 0.23, 0.9, 1.6, and 3.66 patients per year. Fewer than one patient (0.75) per year will wait more than 30 min in a trauma center doing 225 emergency ORs when two neurosurgeons are on-call. One patient in 10 years would wait more than 30 min in a trauma center doing 300 ORs with a third NS on-call. Mathematical modeling of patient data helps define optimal hospital resources. Mandatory NS backup for TC performing fewer than 25 neurosurgery procedures is unneeded.
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Affiliation(s)
- C E Lucas
- Department of Surgery, Wayne State University, Detroit, Michigan 48201, USA
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Tessier AJ, Dombi GW, Bouwman DL. Thermostability of purified human pancreatic alpha-amylase is increased by the combination of Ca2+ and human serum albumin. Clin Chim Acta 1996; 252:11-20. [PMID: 8814357 DOI: 10.1016/0009-8981(96)06316-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Pancreatic fluid from a patient with a post operative pancreatic fistula was used to isolate human alpha-amylase by means of acarbose affinity chromatography. Amylase thermostability was measured in 4 solutions: (1) EDTA-dialyzed; (2) dialyzed solution plus 0.15 mmol/l (1.0 g/dl) human serum albumin; (3) dialyzed solution plus 0.25 mmol/l (1.0 mg/dl) calcium ions; and (4) dialyzed solution with both human serum albumin and calcium ions. Amylase activity was measured at predetermined times in samples heated to 60 degrees C. Thermostability was characterized by t1/2, the time to 50% initial amylase enzyme activity. In the dialyzed solution t1/2 was 0.75 +/- 0.19 min. This rose to 1.62 +/- 0.34 min with added human serum albumin, and to 8.24 +/- 0.13 min with added calcium ions. The combination of human serum albumin and calcium ions resulted in a synergistic increase of t1/2 to 180 +/- 26 min. These findings support our contention that human serum albumin, calcium ions and possibly other body fluid constituents must be considered in any utility involving amylase thermostability as a clinically relevant diagnostic marker.
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Affiliation(s)
- A J Tessier
- Harper Hospital, Department of Surgery, Detroit, MI 48201, USA. atessie/cms.cc.wayne.edu
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Saxe JM, Dombi GW, Lucas WF, Ledgerwood AM, Lucas CE. Hemodynamic, plasma volume, and prenodal skin lymph responses to varied resuscitation regimens. J Trauma 1996; 41:283-9; discussion 289-90. [PMID: 8760538 DOI: 10.1097/00005373-199608000-00015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The theoretical efficacy of hypertonic saline (HS) resuscitation for hemorrhagic shock purportedly stems from the osmolar extraction of intracellular fluid into the plasma. This hypothesis presumes a concomitant expansion of the interstitial fluid space. Colloid resuscitation, in theory, expands the plasma volume by extracting interstitial fluid. These hypotheses were tested in a canine-modified Wigger's model of hemorrhagic shock. Forty, male, splenectomized dogs were anesthetized and instrumented. Animals underwent a baseline equilibration period followed by shock for 120 minutes. Each animal was randomized to one of four groups and received equal amounts of Na+ either as lactated Ringer's (LR) solution, 10% dextran 40 (Dex) in normal saline, 7.5% saline (HS), or 7.5% saline plus Dex (HSD). Parameters measured at baseline, shock, and at postresuscitation 30 minutes, 60 minutes, 90 minutes, and 120 minutes, included: mean pressure (MAP), output, pulmonary capillary wedge pressure, prenodal skin lymph flow, serum and lymph albumin, wet-to-dry skin ratios, and plasma volume. MAP, cardiac output, and plasma volume were most quickly restored with LR and Dex resuscitation (MAP = 106 and 118 mm Hg) compared to HS and HSD (MAP = 98 and 92 mm Hg). Lymph flow and lymph albumin flux were best restored with LR and HSD (mean = 85 and 48 microL/min) compared to Dex and HS (mean = 36 and 37 microL/min). Wet/dry skin ratios were greatest at 60 minutes in the LR group but similar at 120 minutes in all four groups. These data suggest that interstitial fluid space remains contracted during the first hour after HS, HSD, and Dex resuscitation compared with LR resuscitation, even though the restoration of plasma volume, MAP, and cardiac output is greatest with the Dex regimen. Further studies with total body water and intracellular water are needed in this model.
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Affiliation(s)
- J M Saxe
- Department of Surgery, Wayne State University, Detroit, Michigan, USA
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Saba AA, Kaidi AA, Godziachvili V, Dombi GW, Dawe EJ, Libcke JH, Silva YJ. Effects of interleukin-6 and its neutralizing antibodies on peritoneal adhesion formation and wound healing. Am Surg 1996; 62:569-72. [PMID: 8651553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
This study investigates the effects of preoperative IV administration of IL-6 and anti IL-6 on peritoneal adhesion formation and wound healing. Thirty-six male Sprague-Dawley rats (350-400 mg) were divided into three groups: control (group 1); IL-6 (group 2); and anti IL-6 (group 3). Under sterile conditions, all rats underwent a midline laparotomy. Ten cm2 of cecal serosa was abraded, the cecum further irritated with 0.1 ml of 70 per cent alcohol, and the incision closed in layers. At 3 weeks, peritoneal adhesions were graded using a score of 0 (none) to 3 (extensive, dense). Skin samples from incisional sites were examined tensiometrically (true stress and true strain), biochemically (collagen content), and histologically. Adhesion formation score was significantly increased in IL-6 group (2.78 +/- 0.44, Mean +/- SD) and decreased in anti IL-6 group (1.40 +/- 0.52) compared to control (2.00 +/- 0.50). (P < 0.03 by Kruskal Wallis test). There was no significant difference in true stress, true strain, and collagen content between the two treatment groups and controls at the 0.05 level by ANOVA. Histological analysis showed higher number of inflammatory cells and fibroblasts in IL-6 treated groups. We conclude that IL-6 plays a major role in peritoneal adhesion formation. Selective immunosuppression, using IL-6 neutralizing antibodies preoperatively, leads to a reduction of such adhesion formation without a significant effect on wound healing.
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Affiliation(s)
- A A Saba
- Department of Surgery, North Oakland Medical Centers, Pontiac, Michigan 48341, USA
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Walker VR, Dombi GW, Gutai JP, Wade DD, Swartz KH, Liu H, Schroeder RR. Semiautomated method for the quantitation of plasma or sera androstenedione, testosterone, and dihydrotestosterone in population studies. Anal Biochem 1996; 234:194-203. [PMID: 8714598 DOI: 10.1006/abio.1996.0072] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
A method is presented that analyzes quantitatively and reproducibly the androgens testosterone, androstenedione, and dihydrotestosterone from human sera or plasma. The chromatographic separation step generates an unattended throughput of one preparative separation per hour. Controls are built into the method to account for changing chromatographic conditions that otherwise result in shifts in retention characteristics. Separation factors for the three androgens are as follows (mean +/- standard deviation): alpha = 1.23 +/- 0.011 between androstenedione and testosterone and alpha = 1.38 +/- 0.025 between testosterone and dihydrotestosterone. Sensitivities of the method are androstenedione 5 pg, testosterone 3 pg, and dihydrotestosterone 14 pg. A study of procedural losses associated with initial sample processing, a validation, and application to two sample sets which demonstrates the methods utility for the analysis of hypoandrogenic populations (postmenopausal women) and hyperandrogenic groups (prostate cancer patients) is also reported. The precision for replicate aliquots of control plasma is androstenedione and testosterone = 5-11% CV and dihydrotestosterone = 10-20% CV.
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Affiliation(s)
- V R Walker
- Department of Pediatrics, Wayne State University, Detroit, Michigan 48201, USA
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Abstract
Outcome-based therapy is becoming the standard for assessing patient care efficacy. This study examines the ability of an artificial neural network to predict rib fracture injury outcome based on 20 intake variables determined within 1 hour of admission. The data base contained 580 patient records with four outcome variables: Length of hospital stay (LOS), ICU days, Lived, and Died. A 522-patient training set and a 58-patient test set were randomly selected. Nine networks were set up in a feed-forward, back-propagating design with each trained under different initial conditions. These networks predicted the test set outcome variables with an accuracy as high as 98% at the 80% testing level. Internal weight matrix examination indicated that age, ventilatory support, and high trauma scores were strongly associated with both ICU days and mortality. Being female, injury severity, and injury type were associated with increased LOS. Smoking and rib fracture number were low-level predictors of the four outcome variables.
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Affiliation(s)
- G W Dombi
- Wayne State University, Surgery Department, Detroit, Michigan 48201, USA
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Abstract
We studied fibroblast activity during tendon healing with an in vitro tendon culture model. Tendons were embedded in a translucent collagen gel matrix whose porous nature permitted free nutrient diffusion, fibroblast migration out of the tendon, and microphotographic documentation of fibroblast activity. Experiments were performed using one or more tendons cultured in the same collagen gel. We identified three zones of fibroblast activity in the gel. Zone I was an area of randomly dispersed cells directly adjacent to the tendon where collagen synthesis and remodeling were probably taking place. In zone II, spindle-shaped fibroblasts were aligned pointing away from the cut tendon end forming a sunburst-like aggregate of cells. Zone II fibroblasts were responsible for formation of migration trails by exerting a mechanical force on the collagen matrix, which was evident as a local gel contraction. Zone III was the leading edge of the sunburst populated by the fastest moving fibroblasts, which responded to guidance by other cut tendon ends. We speculate that the collagen gel used in the culture system may help maintain a chemotactic concentration gradient that allows fibroblasts to locate other distal cut tendon surfaces also embedded in the collagen gel.
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Affiliation(s)
- D L Packer
- Department of Surgery, Wayne State University, Detroit, MI 48201
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19
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Abstract
Neural networks were used to generalize common themes found in transmembrane-spanning protein helices. Various-sized databases were used containing nonoverlapping sequences, each 25 amino acids long. Training consisted of sorting these sequences into 1 of 2 groups: transmembrane helical peptides or nontransmembrane peptides. Learning was measured using a test set 10% the size of the training set. As training set size increased from 214 sequences to 1,751 sequences, learning increased in a nonlinear manner from 75% to a high of 98%, then declined to a low of 87%. The final training database consisted of roughly equal numbers of transmembrane (928) and nontransmembrane (1,018) sequences. All transmembrane sequences were entered into the database with respect to their lipid membrane orientation: from inside the membrane to outside. Generalized transmembrane helix and nontransmembrane peptides were constructed from the maximally weighted connecting strengths of fully trained networks. Four generalized transmembrane helices were found to contain 9 consensus residues: a K-R-F triplet was found at the inside lipid interface, 2 isoleucine and 2 other phenylalanine residues were present in the helical body, and 2 tryptophan residues were found near the outside lipid interface. As a test of the training method, bacteriorhodopsin was examined to determine the position of its 7 transmembrane helices.
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Affiliation(s)
- G W Dombi
- Surgery Department, Wayne State University, Detroit, Michigan 48201
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Abstract
Severity of lacerative skin injury depends on the applied load and the resistance of the tissue. At low (static) rates of loading there is a high degree of correlation between skin tensile strength and the degree of collagen crosslinking, with little added strength due to collagen interactions with the glycosaminoglycan matrix. We examined the effects of high (ballistic) rates of loading in order to determine the contributions to strength made by both the degree of collagen crosslinking and the collagen-matrix interaction. Tensile failure experiments were conducted using the dorsal skin of rats 1.5-6 months of age. Test specimen orientations were cut parallel and transverse to the body axis at cephalad and caudad locations on the dorsum. Tensile strength was measured at nominal strain rates of 30%/sec (low speed) and 6000%/sec (high speed) using both control and lathyrogen fed rats. Biochemical analyses were conducted to determine the amount of total and crosslinked (insoluble) collagen. In low-speed tests, there was a significant correlation (r > or = 0.900) between collagen content and skin tensile strength measured both transverse and parallel to the spine. The degree of correlation was higher with insoluble (r = 0.973) collagen content than with total (r = 0.901) collagen. The effect of a lathyrogen diet produced a significant (P < 0.001) reduction (two- to threefold) in tensile strength compared to control. In both high- and low-speed groups, tensile strength was greatest in the transverse samples with a significant correlation to collagen content (r > or = 0.858).(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- G W Dombi
- Biomedical Science Department, General Motors Research Laboratories, Warren, MI
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Dombi GW. Limitations of Augustinsson plots. Comput Appl Biosci 1992; 8:475-9. [PMID: 1422881 DOI: 10.1093/bioinformatics/8.5.475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The Augustinsson plot transforms the Michaelis-Menten equation by graphing velocity, v, as a function of velocity/substrate, v/s. The plot is linear with a negative slope for a single class of saturable sites and curvilinear for multiple classes of sites. Statistically, Augustinsson plots suffer from the limitation that there is no true independent variable. Experimental errors form a Gaussian distribution that rests neither parallel to the v axis nor v/s axis, but rather along a line emanating from the origin. Widening the range of s values produces increasingly large errors in the calculated Km and Vm values, especially when multiple sites are present. Exact data containing no error produces accurate constants using either the Michaelis-Menten or Augustinsson equation. With Km and Vm constants previously derived by fitting data with the statistically valid Michaelis-Menten equation, the Augustinsson plot may be used accurately to display multiple site data.
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Affiliation(s)
- G W Dombi
- Plastic Surgery Division, Wayne State University, Detroit, MI 48201
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Schultz KR, Badger CC, Dombi GW, Greenberg PD, Bernstein ID. Effect of interleukin-2 on biodistribution of monoclonal antibody in tumor and normal tissues in mice bearing SL-2 thymoma. J Natl Cancer Inst 1992; 84:109-13. [PMID: 1735876 DOI: 10.1093/jnci/84.2.109] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND Our laboratory demonstrated previously that treatment with a tumor-specific, radiolabeled anti-Thy 1 murine monoclonal antibody (MAb) in mice can eradicate a T-cell lymphoma mass, but the doses required were toxic to normal organs. Approaches to increase MAb concentration in tumor tissue versus normal tissue may overcome this problem. Interleukin-2 (IL-2) has been shown to increase capillary permeability, as indicated by extravasation of albumin. PURPOSE The purpose of this study was to determine whether increased extravasation of MAb at the tumor site might result in selective binding to tumor antigen, increasing localization of radiolabeled MAb at the tumor site. METHODS We studied the effect of IL-2 on biodistribution of 1A14 MAb (anti-Thy 1.1) in normal AKR/Cum (Thy 1.2+) mice and in AKR/Cum mice bearing SL-2, a spontaneous T-cell lymphoma (Thy 1.1+), compared with biodistribution of albumin in normal mice and biodistribution of the nonreactive G3G6 MAb in tumor-bearing mice. IL-2 was given intravenously in the tail vein in doses of 0, 25,000, 50,000, 100,000, or 200,000 U twice a day for a total of seven doses over 3.5 days. Mice received injections of a mixture of 1A14 MAb (250 muCi/100 micrograms) and albumin or G3G6 MAb (145 muCi/100 micrograms) in a total volume of 200 microL at 12 hours after the last IL-2 dose. RESULTS In normal mice, IL-2 caused a dose-dependent increase of both radiolabeled MAb and albumin in the spleen, liver, lung, and lymph node, but it spared the brain. In tumor-bearing mice, IL-2 resulted in higher levels of MAb in the tumors 72 hours after receiving injections, with 17.5% and 24.3% of the injected dose per gram of tumor present in the mice pretreated with 100,000 or 200,000 U of IL-2 twice a day for 3.5 days, compared with 13.4% in the controls. In IL-2-treated mice, levels of MAb were greater in the tumors than in critical normal organs; the differences were statistically significant for tumors versus lungs at 24 hours after injection and for tumors versus livers at 48 hours and 72 hours after injection. CONCLUSIONS These results suggest that pretreatment with IL-2 may lead to enhanced distribution of tumor-specific MAb to the tumor site, compared with normal tissues, thus increasing therapeutic efficacy of radiolabeled MAb.
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Affiliation(s)
- K R Schultz
- Department of Pediatrics, University of Washington, Seattle
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Abstract
Dexamethasone disodium phosphate was found to inhibit in vitro fibrillogenesis in a buffered collagen solution that otherwise formed in vivo like fibrils. A nonlinear relationship was observed between the steroid salt concentration and the kinetic parameter half transition time. Full fibril inhibition occurred at dexamethasone phosphate concentrations above 15 mM. At lower concentrations, sample buffers that also contained inorganic phosphate were not different from the control in activation energy of 224.3 +/- 29.3 kJ/mol (53.6 +/- 7.0 kcal/mol). The idea is advanced that the soluble steroid salt associates directly to the collagen and prevents the formation of lateral, hydrophobic interactions between adjacent collagen aggregates.
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Abstract
Sodium dodecyl sulphate (SDS) was used to weaken both the electrostatic and the hydrophobic interactions during collagen fibrillogenesis in vitro. The rate and extent of fibril formation as well as fibril morphology were affected by SDS concentration. Both the formation of large fibrils at 0.3 mM-SDS and the complete cessation of fibril formation at 0.5 mM-SDS were considered to be the result of SDS-induced conformational changes in the non-helical telopeptides. A possible mechanism of SDS interaction with the N-terminal and the distal region of the C-terminal telopeptides is offered.
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Remenyik CJ, Dombi GW, Halsall HB. Droplet sedimentation: a physical description and qualitative explanation of the phenomenon. Arch Biochem Biophys 1980; 201:500-5. [PMID: 7396518 DOI: 10.1016/0003-9861(80)90538-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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