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Helicobacter pylori–gastrin link in MALT lymphoma (2000)

Konturek, P. C. ; Konturek, S. J. ; Starzyska, T. ; [et al.]

Oxford UK : Blackwell Science Ltd

Alimentary pharmacology & therapeutics 14 (2000), S. 0

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ISSN: 1365-2036

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Medicine

Notes: There is accumulating evidence for the role of Helicobacter pylori in the development of gastric cancer as well as of lymphomas that arise in mucosa-associated lymphoid tissue (MALT). We reported recently that gastric cancer patients show high prevalence of cagA-positive H. pylori and express gastrin and gastrin receptors enabling them to stimulate tumour growth in autocrine fashion.〈section xml:id="abs1-2"〉〈title type="main"〉Aims:Since the H. pylori infection is considered to be more strongly associated with MALT lymphoma than with gastric cancer, we decided to determine the gastrin and its receptors’ mRNA expression and gastrin content in this tumour as well as the release of this hormone both into plasma and gastric lumen. Twenty MALT lymphoma patients were compared with 100 age- and gender-matched controls with similar dyspeptic symptoms.〈section xml:id="abs1-3"〉〈title type="main"〉Results:The overall H. pylori seropositivity in MALT lymphoma was about 90% and CagA positivity was 70%, compared to 56% and 33%, respectively, in controls. The serum gastrin in MALT lymphoma was about sixfold higher than in controls while gastric luminal gastrin in these patients was over 70 times higher than in controls. Gastrin content in tumour was about 10-fold higher than in antral mucosa. Gastrin and gastrin-receptor (CCKB-receptor) mRNA were detected by reverse transcriptase–polymerase chain reaction in cancer tissue whilst in the fundic and antral mucosa, only enhanced expression of CCKB-receptor mRNA and gastrin mRNA was detected, respectively. Histamine stimulation in MALT lymphoma induced acid secretion that was only about 30% of control value due to atrophic gastritis. This study confirms an important role of CagA-positive H. pylori in the pathogenesis of MALT lymphoma and shows that this lymphoma is capable of synthesizing and releasing potent growth promoting gastrin, possibly due to the action on G-cells of H. pylori-originated Nα-methyl histamine and cytokines (tumour necrosis factor alpha and interleukin-8).〈section xml:id="abs1-4"〉〈title type="main"〉Conclusions:Gastric MALT lymphoma is closely linked to CagA-positive H. pylori infection. Gastrin and its receptors may be implicated in the pathogenesis of gastric lymphoma.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1046/j.1365-2036.2000.00832.x

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The influence of extractives on the radiation stability of wood (1970)

Lawniczak, M. ; Raczkowski, J.

Springer

Wood science and technology 4 (1970), S. 45-49

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ISSN: 1432-5225

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Summary The critical dose above which a decrease in toughness of Western Red Cedar and Peroba wood, extracted with benzene-alcohol is noted, was determined to be approximately 0.5×106 rad lower than that for the same non-extracted species. Investigations have shown that the presence of benzene-alcohol extractives in wood raises its radiation stability. This conclusion is supported by the fact that the toughness curve which generally falls with increasing doses of absorbed irradiation shows a steeper decrease for extracted than for nonextracted wood.