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Gene Review

SERPINI2  -  serpin peptidase inhibitor, clade I...

Homo sapiens

Synonyms: MEPI, Myoepithelium-derived serine protease inhibitor, PANCPIN, PI-14, PI14, ...
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Disease relevance of SERPINI2

  • To determine whether MEPI can modulate the in vivo growth and progression of human breast cancers, we transfected a full-length MEPI cDNA into human breast cancer cells and studied the orthotopic growth of MEPI-transfected vs. control clones in the mammary fat pad of athymic nude mice [1].
  • No MEPI expression was detected in the malignant breast carcinomas [1].
  • The expression of MEPI in myoepithelial cells may prevent breast cancer malignant progression leading to metastasis [1].
  • These findings indicate that down-regulation of pancpin expression may play a significant role in development or progression of pancreatic cancer [2].
  • Despite "normal ventriculograms and normal MEPI, eight patients with left anterior descending coronary artery stenoses (greater than 60%) also had definitely depressed ejection indices during first third of systole [3].

High impact information on SERPINI2

  • In situ hybridization has detected this serpin exclusively in the myoepithelial cells on the normal and noninvasive mammary epithelial side of the basement membrane and thus was named myoepithelium-derived serine proteinase inhibitor (MEPI) [1].
  • By screening genomic libraries, we isolated two overlapping clones showing that the marker SGC32223 (centromere) is located within intron F of PI12 and the marker WI-10077 (telomere) is located downstream of the 3'-flanking region of PI14 [4].
  • In this, unlike a previous study, both PI14 and PI12 at 3q26 were found to consist of 9 exons and 8 introns and to share a perfectly conserved gene organization whose pattern is very different from that of the ov-serpin family [4].
  • The cDNA, designated "pancpin," contained an open reading frame of 1,215 nucleotides encoding a 405 amino acid protein, showing a high degree of similarity to serine protease inhibitors belonging to the serpin superfamily [2].
  • Isolation and characterization of a novel human pancreas-specific gene, pancpin, that is down-regulated in pancreatic cancer cells [2].

Anatomical context of SERPINI2

  • Expression of pancpin was barely detectable in any of the four pancreatic cancer cell lines examined, and very weak also in 10 of 13 pancreatic cancer tissues [2].
  • These data show that indices based on early SER are more sensitive than MEPI (MVcf, MNSER) for detecting abnormalities in ventricular performance in coronary artery disease;[3]
  • Forty-five ASA physical status I or II patients scheduled for elective hallux valgus repair with thigh tourniquet were randomized to receive combined sciatic-femoral block with 0.75% ropivacaine (ROPI, n = 15), 0.5% bupivacaine (BUPI, n = 15), and 2% mepivacaine (MEPI, n = 15) [5].

Associations of SERPINI2 with chemical compounds

  • RESULTS: Use of tamoxifen prolonged the average survival of cohort members by 69 days (95% probability interval [PI] 27 to 117) for those who started use at age 35 years; 40 days (95% PI 16 to 67) for those who started use at age 50 years; and 27 days (95% PI 14 to 40) for those who started use at age 60 years [6].

Analytical, diagnostic and therapeutic context of SERPINI2

  • Duration of postoperative analgesia was significantly longer in Groups ROPI (670+/-227 min) and BUPI (880+/-312 min) compared with Group MEPI (251+/-47 min) (P = 0.0001), with a significant decrease in postoperative pain medication requirements (P < 0.05) [5].


  1. Suppression of breast cancer growth and metastasis by a serpin myoepithelium-derived serine proteinase inhibitor expressed in the mammary myoepithelial cells. Xiao, G., Liu, Y.E., Gentz, R., Sang, Q.A., Ni, J., Goldberg, I.D., Shi, Y.E. Proc. Natl. Acad. Sci. U.S.A. (1999) [Pubmed]
  2. Isolation and characterization of a novel human pancreas-specific gene, pancpin, that is down-regulated in pancreatic cancer cells. Ozaki, K., Nagata, M., Suzuki, M., Fujiwara, T., Miyoshi, Y., Ishikawa, O., Ohigashi, H., Imaoka, S., Takahashi, E., Nakamura, Y. Genes Chromosomes Cancer (1998) [Pubmed]
  3. Volume ejected in early systole. A sensitive index of left ventricular performance in coronary artery disease. Johnson, L.L., Ellis, K., Schmidt, D., Weiss, M.B., Cannon, P.J. Circulation (1975) [Pubmed]
  4. Tissue-specific cancer-related serpin gene cluster at human chromosome band 3q26. Chang, W.S., Chang, N.T., Lin, S.C., Wu, C.W., Wu, F.Y. Genes Chromosomes Cancer (2000) [Pubmed]
  5. A double-blind comparison of ropivacaine, bupivacaine, and mepivacaine during sciatic and femoral nerve blockade. Fanelli, G., Casati, A., Beccaria, P., Aldegheri, G., Berti, M., Tarantino, F., Torri, G. Anesth. Analg. (1998) [Pubmed]
  6. Decision analysis of tamoxifen for the prevention of invasive breast cancer. Grann, V.R., Sundararajan, V., Jacobson, J.S., Whang, W., Heitjan, D.F., Antman, K.H., Neugut, A.I. Cancer journal (Sudbury, Mass.) (2000) [Pubmed]
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