Studies of the Stimulation of Non-Specific Defense Mechanisms by NeyTumorin�-Sol

2015 ◽  
pp. 80-85
Author(s):  
A. Mayr ◽  
M. B�ttner ◽  
S. Pawlas
Keyword(s):  
Defense Mechanisms ◽  
Stimulation Of

Stimulation of TLRs by LMW‐HA induces self‐defense mechanisms in vaginal epithelium

2010 ◽  
Vol 89 (5) ◽  
pp. 630-639 ◽  
Author(s):  
Giuseppina F Dusio ◽  
Diego Cardani ◽  
Laura Zanobbio ◽  
Martina Mantovani ◽  
Patrizia Luchini ◽  
...  
Keyword(s):  
Defense Mechanisms ◽  
Vaginal Epithelium ◽  
Self Defense ◽  
Stimulation Of

GSH transport and GSH-dependent detoxication in small intestine of rats exposed in vivo to hypoxia

1996 ◽  
Vol 271 (4) ◽  
pp. G701-G706
Author(s):  
C. Bai ◽  
D. P. Jones
Keyword(s):  
Small Intestine ◽  
Defense Mechanisms ◽  
Chronic Hypoxia ◽  
Thiobarbituric Acid ◽  
Transport Systems ◽  
Hypoxic Exposure ◽  
Thiobarbituric Acid Reactive Substances ◽  
Related Enzyme ◽  
Stimulation Of

The effects of hypoxia on glutathione (GSH) concentration and GSH-related enzyme and transport systems were studied in the small intestine of rats exposed to 8-10 days of 10.5% O2. Exposure to hypoxia resulted in a 40% lower GSH concentration in enterocytes and a 50% lower concentration in blood plasma. Activities of GSH-related detoxication enzymes in the intestinal epithelium were largely unaffected by hypoxic exposure. GSH degradation and synthesis rates in enterocytes isolated from hypoxic rats were comparable with rates in normoxic controls, but GSH uptake rate was decreased by 30%. Stimulation of absorption of GSH by phenylephrine, such as occurs in control rats, was not detectable in isolated, vascularly perfused intestines of hypoxic rats. Decreased GSH uptake was associated with enhanced transepithelial appearance of thiobarbituric acid-reactive substances in everted intestinal sacs incubated with peroxidized methyl linoleate. These results suggest that chronic hypoxia results in impaired uptake of GSH in the small intestine, and this may result in impaired GSH-related defense mechanisms in the small intestine.

scholarly journals Dynamics of changes in nonspecific resistance of guinea pigs under conditions of formation of experimental periodontitis and immobilization stress

2021 ◽  
Vol 11 (11) ◽  
pp. 67-72
Author(s):  
P. Olekshij
Keyword(s):  
Defense Mechanisms ◽  
Polymorphonuclear Leukocytes ◽  
Inflammatory Process ◽  
Immobilization Stress ◽  
Diagnostic Value ◽  
Phagocytic Index ◽  
Nonspecific Resistance ◽  
Experimental Periodontitis ◽  
Test Increase ◽  
Stimulation Of

The aim of our study was to determine the phagocytic activity of leukocytes and nitrosine tetrazolium test (NST - test) in the dynamics of experimental periodontitis (EP) and immobilization stress (IS). It is established in the work that the indicators studied by us, namely phagocytic number, phagocytic index and NST - test increase on the 3 rd, 5 th and 15 th days of our experiment. The above tests have a high diagnostic value and allow to characterize the degree of activity of the inflammatory process and determine the participation of individual parts of the body's defense mechanisms. The obtained results make it possible to express the opinion that polymorphonuclear leukocytes take an active part in the formation of EP and IS, as well as indicate the stimulation of metabolic processes in leukocytes.

Effects of 5-5'-Diphenyl-2-thiohydantoin (DPTH) and Thyroxine on the Ultrastructure and Chemical Composition of Rat Liver

1971 ◽  
Vol 29 ◽  
pp. 570-571
Author(s):  
E. A. Elfont ◽  
R. B. Tobin ◽  
D. G. Colton ◽  
M. A. Mehlman
Keyword(s):  
Chemical Composition ◽  
Rat Liver ◽  
Future Study ◽  
Mode Of Action ◽  
Liver Mitochondria ◽  
Rat Liver Mitochondria ◽  
Effective Inhibitor ◽  
Biochemical Effects ◽  
Glycerophosphate Dehydrogenase ◽  
Stimulation Of

Summary5,-5'-diphenyl-2-thiohydantoin (DPTH) is an effective inhibitor of thyroxine (T4) stimulation of α-glycerophosphate dehydrogenase in rat liver mitochondria. Because this finding indicated a possible tool for future study of the mode of action of thyroxine, the ultrastructural and biochemical effects of DPTH and/or thyroxine on rat liver mere investigated.Rats were fed either standard or DPTH (0.06%) diet for 30 days before T4 (250 ug/kg/day) was injected. Injection of T4 occurred daily for 10 days prior to sacrifice. After removal of the liver and kidneys, part of the tissue was frozen at -50°C for later biocheailcal analyses, while the rest was prefixed in buffered 3.5X glutaraldehyde (390 mOs) and post-fixed in buffered 1Z OsO4 (376 mOs). Tissues were embedded in Araldlte 502 and the sections examined in a Zeiss EM 9S.Hepatocytes from hyperthyroid rats (Fig. 2) demonstrated enlarged and more numerous mitochondria than those of controls (Fig. 1). Glycogen was almost totally absent from the cytoplasm of the T4-treated rats.

New Ultrastructural Observations on Injury and Regeneration of Cilia in Mammalian Conducting Airway Epithelium

1981 ◽  
Vol 39 ◽  
pp. 624-625
Author(s):  
J.L. Carson ◽  
A.M. Collier
Keyword(s):  
Respiratory Tract ◽  
Airway Epithelium ◽  
Defense Mechanisms ◽  
Normal Growth ◽  
Fetal Lung ◽  
Secretory Cells ◽  
Airway Epithelial ◽  
Ciliated Cells ◽  
Conducting Airway ◽  
Conducting Airways

The ciliated cells lining the conducting airways of mammals are integral to the defense mechanisms of the respiratory tract, functioning in coordination with secretory cells in the removal of inhaled and cellular debris. The effects of various infectious and toxic agents on the structure and function of airway epithelial cell cilia have been studied in our laboratory, both of which have been shown to affect ciliary ultrastructure.These observations have led to questions about ciliary regeneration as well as the possible induction of ciliogenesis in response to cellular injury. Classical models of ciliogenesis in the conducting airway epithelium of the mammalian respiratory tract have been based primarily on observations of the developing fetal lung. These observations provide a plausible explanation for the embryological generation of ciliary beds lining the conducting airways but do little to account for subsequent differentiation of ciliated cells and ciliogenesis during normal growth and development.

Gap junctions in the prothoracic glands of the tobacco hornworm, Manduca sexta

1992 ◽  
Vol 50 (1) ◽  
pp. 706-707
Author(s):  
Ji-da Dai ◽  
M. Joseph Costello ◽  
Lawrence I. Gilbert
Keyword(s):  
Gap Junctions ◽  
Small Molecules ◽  
Manduca Sexta ◽  
Freeze Fracture ◽  
Cell Communication ◽  
Cellular Level ◽  
Thin Sections ◽  
Prothoracic Glands ◽  
Polyhydroxylated Steroids ◽  
Stimulation Of

Insect molting and metamorphosis are elicited by a class of polyhydroxylated steroids, ecdysteroids, that originate in the prothoracic glands (PGs). Prothoracicotropic hormone stimulation of steroidogenesis by the PGs at the cellular level involves both calcium and cAMP. Cell-to-cell communication mediated by gap junctions may play a key role in regulating signal transduction by controlling the transmission of small molecules and ions between adjacent cells. This is the first report of gap junctions in the PGs, the evidence obtained by means of SEM, thin sections and freeze-fracture replicas.

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