Abstract
An antibody (anti-EH) specific for microsomal epoxide hydrolase (mEH)from rhesus monkey liver has been used to test the immunochemical relationship between human liver mEH and the serum EH levels in human patients with hepato-cellular carcinoma (HCC). Immunoblots of separated rhesus monkey and human liver microsomal proteins revealed that anti-EH was selective for a single polypeptide band of similar mol. wt, 7sim; 49 kd, in both species. Anti-EH was also able to precipitate 100% of the activity for two substrates specific in the mouse for mEH, cis-stilbene oxide and benzo[a]-pyrene-4, 5-oxide, in solubilized human liver microsomes. In contrast, only 20% of the microsomal trans-stilbene oxide hydrolase activity was precipitated under similar conditions, providing immunochemical evidence that a distinct EH, with substrate selectivity similar to the cytosolic EH, resides in human liver microsomes. Immunoprecipitation of serum from a patient with elevated EH activity resulted in total precipitation of cis-stilbene oxide hydrolase activity. An enzyme-linked immunoabsorbant assay (ELISA) was developed using anti-EH with detection limits of 1 ng/ml. A high correlation between the enzymatically and immunochemically determined levels of serum EH provided further evidence for the immunochemical similarity of human liver microsomal and serum EH. In addition, the ELISA was equally capable of identifying elevated serum EH in patients with HCC, and should prove invaluable in evaluating the effectiveness of serum EH levels as a marker for HCC.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 343-349 |
| Number of pages | 7 |
| Journal | Carcinogenesis |
| Volume | 10 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 1989 |
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ASJC Scopus subject areas
- Statistics, Probability and Uncertainty
- Applied Mathematics
- Physiology (medical)
- Physiology
- Behavioral Neuroscience
- Cancer Research
Cite this
Immunochemical comparison of human and rhesus monkey liver microsomal and the hepatocellular carcinoma-induced human serum epoxide hydrolases (preneoplastic antigens) : Basis for an enzyme-linked immunoabsorbent assay. / Moody, David E.; Hammock, Bruce D.; Ruebner, Boris H.; Hillman, David W.; Hillman, James H.
In: Carcinogenesis, Vol. 10, No. 2, 02.1989, p. 343-349.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Immunochemical comparison of human and rhesus monkey liver microsomal and the hepatocellular carcinoma-induced human serum epoxide hydrolases (preneoplastic antigens)
T2 - Basis for an enzyme-linked immunoabsorbent assay
AU - Moody, David E.
AU - Hammock, Bruce D.
AU - Ruebner, Boris H.
AU - Hillman, David W.
AU - Hillman, James H.
PY - 1989/2
Y1 - 1989/2
N2 - An antibody (anti-EH) specific for microsomal epoxide hydrolase (mEH)from rhesus monkey liver has been used to test the immunochemical relationship between human liver mEH and the serum EH levels in human patients with hepato-cellular carcinoma (HCC). Immunoblots of separated rhesus monkey and human liver microsomal proteins revealed that anti-EH was selective for a single polypeptide band of similar mol. wt, 7sim; 49 kd, in both species. Anti-EH was also able to precipitate 100% of the activity for two substrates specific in the mouse for mEH, cis-stilbene oxide and benzo[a]-pyrene-4, 5-oxide, in solubilized human liver microsomes. In contrast, only 20% of the microsomal trans-stilbene oxide hydrolase activity was precipitated under similar conditions, providing immunochemical evidence that a distinct EH, with substrate selectivity similar to the cytosolic EH, resides in human liver microsomes. Immunoprecipitation of serum from a patient with elevated EH activity resulted in total precipitation of cis-stilbene oxide hydrolase activity. An enzyme-linked immunoabsorbant assay (ELISA) was developed using anti-EH with detection limits of 1 ng/ml. A high correlation between the enzymatically and immunochemically determined levels of serum EH provided further evidence for the immunochemical similarity of human liver microsomal and serum EH. In addition, the ELISA was equally capable of identifying elevated serum EH in patients with HCC, and should prove invaluable in evaluating the effectiveness of serum EH levels as a marker for HCC.
AB - An antibody (anti-EH) specific for microsomal epoxide hydrolase (mEH)from rhesus monkey liver has been used to test the immunochemical relationship between human liver mEH and the serum EH levels in human patients with hepato-cellular carcinoma (HCC). Immunoblots of separated rhesus monkey and human liver microsomal proteins revealed that anti-EH was selective for a single polypeptide band of similar mol. wt, 7sim; 49 kd, in both species. Anti-EH was also able to precipitate 100% of the activity for two substrates specific in the mouse for mEH, cis-stilbene oxide and benzo[a]-pyrene-4, 5-oxide, in solubilized human liver microsomes. In contrast, only 20% of the microsomal trans-stilbene oxide hydrolase activity was precipitated under similar conditions, providing immunochemical evidence that a distinct EH, with substrate selectivity similar to the cytosolic EH, resides in human liver microsomes. Immunoprecipitation of serum from a patient with elevated EH activity resulted in total precipitation of cis-stilbene oxide hydrolase activity. An enzyme-linked immunoabsorbant assay (ELISA) was developed using anti-EH with detection limits of 1 ng/ml. A high correlation between the enzymatically and immunochemically determined levels of serum EH provided further evidence for the immunochemical similarity of human liver microsomal and serum EH. In addition, the ELISA was equally capable of identifying elevated serum EH in patients with HCC, and should prove invaluable in evaluating the effectiveness of serum EH levels as a marker for HCC.
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U2 - 10.1093/carcin/10.2.343
DO - 10.1093/carcin/10.2.343
M3 - Article
VL - 10
SP - 343
EP - 349
JO - Carcinogenesis
JF - Carcinogenesis
SN - 0143-3334
IS - 2
ER -