Disease relevance of CA13

• The present study was designed to investigate CA XIII expression in prospectively collected colorectal tumor samples [1].
• CA13 is a complex intersubtype recombinant between subtypes A, H and unclassified strains CONCLUSION: Near-full-length genome analysis identified HIV-1 VI991 and VI997 as two new subtype H representatives [2].
• Fifty-three patients (88%) showed chromosomal abnormalities (CA) before the allotransplant, including 42 with abnormalities involving 13q (CA13) [3].
• Metaphase cytogenetic abnormalities (CAs), especially of chromosome 13 (CA 13), confer a grave prognosis in multiple myeloma even with tandem autotransplantations as applied in Total Therapy I, which enrolled 231 patients between 1989 and 1994 [4].

High impact information on CA13

• After radiolabeling, both DU-PAN 1 intact monoclonal antibody and F(ab')2 fragments retained immunoreactivity and showed high affinity for the pancreatic tumor cell line CA13 in vitro [5].
• Using panels of cDNAs we evaluated human and mouse CA13 gene expression in a number of different tissues [6].
• Near-full-length genomes of VI991 and VI997, and gag and env genes of CA13 and VI557, were amplified by polymerase chain reaction, cloned and sequenced [2].
• Excellent CA XIII activating properties were shown by D-amino acids (His, Phe, DOPA, and Trp), serotonin, and 4-(2-aminoethyl)-morpholine, whereas the corresponding L-amino acids, dopamine, histamine, and 1-(2-aminoethyl)-piperazine, were weaker activators [7].
• Because CA XIII is an active isozyme predominantly expressed in salivary glands, kidney, brain, lung, gut, uterus, and testis, where it probably plays an important role in pH regulation, its inhibition by sulfonamides may lead to novel therapeutic applications for this class of pharmacological agents [8].

Biological context of CA13

• When we used these markers in a HA lineage where the mother was a carrier according to coagulation factor assays, carrier diagnosis was possible using CA-13, the HindIII RFLP, and the BclI RFLP [9].
• Long-term follow-up on Total Therapy I revealed, with a median follow-up of about 10 years, median durations of event-free survival (EFS) and overall survival (OS) of 37 and 80 mos in the 88% of patients lacking cytogenetic abnormalities (CA) of chromosome 13 compared to only 28 and 34 mos in those with CA 13 [10].

Anatomical context of CA13

• Expression of a novel carbonic anhydrase, CA XIII, in normal and neoplastic colorectal mucosa [1].

Associations of CA13 with chemical compounds

• The inhibition of the newly discovered cytosolic carbonic anhydrase isozyme XIII (CA XIII) has been investigated with a series of aromatic and heterocyclic sulfonamides, including some of the clinically used derivatives, such as acetazolamide, methazolamide, dichlorophenamide, dorzolamide, and valdecoxib [8].
• The clinically used compounds (except valdecoxib, which was a weak CA XIII inhibitor) potently inhibit CA XIII, with Ki's in the range of 17-23 nM, whereas sulfanilamide, halogenated sulfanilamides, homosulfanilamide, 4-aminoethylbenzenesulfonamide, and orthanilamide were slightly less effective, with Ki's in the range of 32-56 nM [8].

Other interactions of CA13

• CA XIII is the newest member of the CA gene family [1].
• These markers include CA repeat polymorphisms at intron 13 (CA-13) and CT-AG at intron 22 of the coagulation factor VIII (FVIII) gene, and also certain restriction fragment length polymorphisms (RFLPs) such as HindIII at intron 19 and BclI at intron 18 [9].

Analytical, diagnostic and therapeutic context of CA13

• Among all CAs and standard prognostic factors examined prior to therapy, only hypodiploidy and CA 13 (hypo-13 CA), alone or in combination, were associated with shortest event-free survival and overall survival (OS) [4].

References