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At least 163 records · Page 9Linked to original sources
PubMed2005

[Seringueira's latex membrane (Hevea brasiliensis) with and without polylysine 0.1% and marlex mesh for the reconstruction of iatrogenics abdominal wall defects in rats].

PURPOSE: To compare seringueira latex membrane implant, with and without polylysine at 0.1% and marlex mesh on the repair of iatrogenic abdominal defects in rats. METHODS: A circular segment block of approximate three centimeters of diameter was sectioned out of the ventral abdominal muscle wall of 31 Wistar rats. The skin was preserved. The animals were divided into three experimental groups: only latex, latex and polylysine at 0.1%, and marlex mesh. Some rats underwent euthanasia at five and some at 120 days after surgery. Fragments of abdominal wall were collected and submitted at histopathologic analysis. RESULTS: The main alterations observed in groups treated with the latex membrane with and without polylysine were dehiscence (21 animals) and evisceration (two animals). The elimination of implant occurred at an average of 13.8 days. These animals presented fiber conjunctive tissue formation, similar to that observed in the group which received the marlex mesh. Other alterations noted were viscera-parietal adherences in all evaluated groups. CONCLUSION: The seringueira' s latex membrane, with or without polylysine 0.1%, when used on the reconstruction of abdominal defects in rats is eliminated at 13.8 days after its implantation, leaving a fiber base of reparation, similar to that observed after marlex mesh implantation.

Abdominal Wall↗
PubMed1995

Processed products of the hevein precursor in the latex of the rubber tree (Hevea brasiliensis).

The 20 kDa precursor of hevein and its C-terminal 14 kDa domain have been isolated. Sequence analysis of the C-terminal tryptic peptides of these proteins and comparison with the cDNA sequence indicate that they represent mature forms from which a C-terminal propeptide, possibly involved in vacuolar targeting, has been removed. The molar ratio of hevein to the C-terminal domain in the lutoid-body fraction of rubber latex is about 30:1. This indicates that not only the pre- and propeptides but also the 14 kDa domain are removed by proteolysis or other processes in the latex vessel after the processing of hevein has taken place.

Amino Acid Sequence↗
PubMed1993

The rubber elongation factor of rubber trees (Hevea brasiliensis) is the major allergen in latex.

BACKGROUND: Allergy to latex-containing articles is becoming more and more important because it can result in unexpected life-threatening anaphylactic reactions in sensitized individuals. METHODS: A protein of 58 kd with an isoelectric point of 8.45 was purified from raw latex and from latex gloves and identified as the major allergen, completely blocking specific IgE antibodies in the serum of latex-sensitized subjects. The allergen is a noncovalent homotetramer molecule, in which the 14.6 kd monomer was identified, by amino acid composition and sequence homologies of tryptic peptides, to be the rubber elongation factor found in natural latex of the Malaysian rubber tree. RESULTS: Competitive immunoinhibition tests showed that the starch powder covering the finished gloves is the airborne carrier of the allergen, resulting in bronchial asthma on inhalation. The purified allergen can induce allergic reactions in the nanogram range. CONCLUSION: The identification of the allergen (Hev b I) may help to eliminate it during the production of latex-based articles in the future.

Allergens↗