Linked Life Data

3475921

Source:http://linkedlifedata.com/resource/pubmed/id/3475921

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:dateCreated
1987-9-21
pubmed:abstractText
Autoantibodies (aAb) in serum of patients with autoimmune thyroid diseases (AITD) are directed to an antigen associated with thyroid microsomes. Although it has been investigated over almost three decades, the nature of this autoantigen remained unknown. Taking advantage of monoclonal antibodies (mAb) produced in our laboratory, we have demonstrated that thyroid peroxidase (TPO) is the 'microsomal' antigen. Sera of patients with AITD strongly inhibited the binding of only one of 19 mAb raised against human thyroid plasma membranes. This mAb did not react with thyroglobulin but achieved significant binding to preparations of human, bovine and porcine TPO, bovine lactoperoxidase and human myeloperoxidase without altering the enzyme activity. The mAb has been used to immunopurify the human TPO from solubilized thyroid microsomes. The procedure allowed high purification (approximately 3500-fold) of the native enzyme with a reasonable yield (approximately 10 mg TPO/kg thyroid tissue). Human TPO exhibited a specific activity of 350-400 guaiacol U/mg, a peak in the Soret region and a ratio of A411 nm to A280 nm of 0.20-0.25. Upon SDS-polyacrylamide gel electrophoresis, the purified enzyme gave two contiguous bands in the 100 kDa region. Performed in non-reducing conditions, electrophoresis of TPO showed one band in the same 100 kDa region. Sera with aAb to the microsomal antigen immunoprecipitated purified TPO to an extent ranging from 80 to 100% of the initial enzyme amount while sera from normal subjects or from patients with undectable level of anti-microsomal aAb elicit a decrease of less than 30% of the total TPO activity.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0300-9750
pubmed:author
pubmed:issnType
Print
pubmed:volume
281
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
49-56
pubmed:dateRevised
2008-2-12
pubmed:meshHeading
pubmed:year
1987
pubmed:articleTitle
Thyroid peroxidase is the organ-specific 'microsomal' autoantigen involved in thyroid autoimmunity.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't