Fluorescence-based evaluation of the partitioning of lipids and lipidated peptides into liquid-ordered lipid microdomains: a model for molecular partitioning into "lipid rafts"

A fluorescence-quenching assay is described that can directly monitor the relative extents of partitioning of different but structurally homologous fluorescent molecules into liquid-ordered (l(o)) domains in lipid vesicles exhibiting liquid-ordered/liquid-disordered (l(o)/l(d)) phase coexistence. Applying this assay to a series of bimane-labeled diacyl phospholipid probes in cholesterol-containing ternary lipid mixtures exhibiting l(o)/l(d) phase separation, we demonstrate that partitioning into l(o)-phase domains is negligible for diunsaturated species and greatest for long-chain disaturated species. These conclusions agree well with those derived from previous studies of the association of lipids and lipid-anchored molecules with l(o)-phase domains, using methods based on the isolation of a detergent-insoluble fraction from model or biological membranes at low temperatures. However, we also find that monounsaturated and shorter-chain saturated species partition into l(o) phases with significant, albeit modest affinities, and that the level of partitioning of these latter species into l(o)-phase domains is significantly underestimated (relative to that of their long-chain saturated counterparts) by the criterion of low-temperature detergent insolubility. Finally, applying the fluorescence-quenching method to a family of lipid-modified peptides, we demonstrate that the S-palmitoyl/S-isoprenyl dual-lipidation motif found in proteins such as H- and N-ras and yeast Ste18p does not promote significant association with l(o) domains in l(o)/l(d)-phase-separated bilayers.

Adenoid basal carcinomas of the cervix: a unique morphological evolution with cell cycle correlates

Adenoid basal carcinoma (ABC) is a rare cervical carcinoma of postmenopausal women composed of small basal-type (basaloid) cells with focal endocervical ("adenoid") differentiation. ABCs are associated with high-grade squamous intraepithelial lesions (HSIL) and contain integrated human papillomavirus type 16 DNA. However, ABCs have a favorable prognosis and do not metastasize. Five (5) ABCs were analyzed histologically for a marker distinguishing basal/ squamous from columnar (adenoid) differentiation (p63) and cell cycle activity (Ki-67), and compared with 20 cervical (CC) carcinomas. In contrast to other CCs, ABCs contained 4 distinct components, including (1) a classic HSIL; (2) a limited invasive component with squamoid maturation, often with a discrete layer of peripheral basal cells; (3) outgrowth of small basal cells from either HSIL or squamoid areas; (4) focal endocervical (adenoid) differentiation. ABCs showed distinct differences in cell cycle activity relative to CCs. Ki-67 positivity was high in associated HSILs but remained high and concentrated in the suprabasal cells of the invasive squamoid component of ABC. Moreover, proliferative index was variable to sharply reduced in areas of basaloid and adenoid differentiation, in contrast to conventional CCs. ABC is a unique neoplasm, not only by its transition through multiple phenotypes during invasion, but also by a proliferative index that is high in more mature neoplastic cells during the infiltrative process and reduced with progressive basal differentiation. The precise mechanism underlying this unique process of tumor evolution is unclear. However, the postmenopausal status of these patients suggests that host factors related to aging may influence tumor evolution and morphology after HPV 16 infection.

Prenatal diagnosis of partial trisomy 3p(3p23-->pter) and monosomy 7q(7q36-->qter) in a fetus with microcephaly alobar holoprosencephaly and cyclopia

We report the prenatal diagnosis of partial trisomy 3p(3p23-->pter) and monosomy 7q(7q36-->qter) in a fetus with microcephaly, alobar holoprosencephaly and cyclopia. A 26-year-old primigravida woman was referred for genetic counselling at 23 gestational weeks due to sonographic findings of intra-uterine growth retardation and cranio-facial abnormalities. Level II ultrasonograms further demonstrated alobar holoprosencephaly, a proboscis above the eye and a single median orbit consistent with cyclopia. Genetic analysis and fluorescence in situ hybridization on cells obtained from amniocentesis showed distal 3p trisomy (3p23-->pter) and 7q36 deletion, 46,XX,der(7)t(3;7)(p23;q36), resulting from a paternal t(3;7) reciprocal translocation. The pregnancy was terminated. Autopsy further confirmed the presence of arrhinencephaly, agenesis of the corpus callosum and a single ventricle of the brain. The phenotype of this antenatally diagnosed case is compared with those observed in 10 previously reported cases with simultaneous occurrence of partial trisomy 3p and terminal deletion 7q. All cases are associated with severe forms of holoprosencephaly and facial dysmorphism. This delineates an autosomal imbalance syndrome or a dosage effect involving duplication of distal 3p/deficiency of terminal 7q and dysmorphogenesis of the forebrain and mid-face.

Prenatal diagnosis of a fetus with distal 10q trisomy

Distal 10q trisomy is a well-defined but rare syndrome. Most cases are diagnosed in infancy or in childhood and rarely include prenatal findings. We present a case of fetal distal 10q trisomy with abnormal prenatal sonographic findings. A 19-year-old primigravida was referred for genetic counselling at 18 gestational weeks because her husband had a familial history of congenital anomalies. Genetic amniocentesis was thus performed and showed fetal distal 10q trisomy (10q24.1-->qter), 46,XX,der(22)t(10;22)(q24.1;p11.2)pat, resulting from paternal t(10;22) reciprocal translocation. Level II ultrasonograms further demonstrated bilateral hydronephrosis, ventricular septal defect and facial dysmorphism ascertained by three-dimensional ultrasound. The pregnancy was terminated at 22 gestational weeks. Post-mortem autopsy confirmed the sonographic findings. We suggest that abnormal prenatal sonographic findings such as cardio-vascular, renal and facial malformations should alert cytogeneticists to search for subtle chromosomal abnormalities.

A frame shift mutation in the DNA-binding domain of the androgen receptor gene associated with complete androgen insensitivity, persistent müllerian structures, and germ cell tumors in dysgenetic gonads

OBJECTIVE

To describe the molecular, cytogenetic, immunohistochemical, and endocrinologic characteristics of a young 46,XY female with persistent müllerian structures and germ cell tumors in dysgenetic gonads.

DESIGN

Descriptive case study.

SETTING

Mackay Memorial Hospital and National Yang-Ming University, Taipei, Taiwan.

PATIENT(S)

A 22-year-old 46,XY female with persistent müllerian structures, a low level of serum testosterone, and no apparent adnexal masses.

INTERVENTION(S)

Laparoscopic removal of the dysgenetic gonads.

MAIN OUTCOME MEASURE(S)

Detection of an androgen receptor gene mutation by a semiautomated DNA sequencer, of the chromosomal complement by cytogenetic examination, of placental alkaline phosphatase activity by immunohistochemical analysis, and of neoplasms in dysgenetic gonads by histologic studies.

RESULT(S)

A unilateral gonadoblastoma and a contralateral gonadoblastoma associated with a dysgerminoma were found in the excised gonads. The tumors had a 46,XY complement. Placental alkaline phosphatase was present in the tumor cells. A frameshift mutation in the DNA-binding domain of the androgen receptor gene was detected in the patient's blood and the tumor tissues. A five-nucleotide "AGGAA" deletion at codons 608 and 609 of the androgen receptor gene resulted in a missing arginine and lysine as well as a frameshift that introduced a stop codon 12 amino acid downstream from the mutation.

CONCLUSION(S)

Molecular genetic analysis of the androgen receptor gene aids in the rapid diagnosis of complete androgen insensitivity irrespective of atypical clinical phenotypes and endocrinologic parameters.

Comparison of fluid-based, thin-layer processing and conventional Papanicolaou methods for uterine cervical cytology

This study was conducted to compare the diagnoses and specimen adequacy of the ThinPrep (Cytyc Corporation, Boxborough, MA, USA) and conventional Papanicolaou preparation methods for cervical cytology. Cervical specimens from 972 patients from our gynecology clinic were analyzed. A single sample of the uterine cervix taken from each patient was first used to prepare the conventional Papanicolaou smear. Afterward, the residual tissue on the sampling device was rinsed into a fluid preservative from which two slides were prepared by means of the ThinPrep method. Conventional and ThinPrep slides were examined independently. Cytologic diagnoses and specimen adequacy were classified according to the Bethesda System. The diagnoses based on the ThinPrep and conventional smears matched in 939 (96.6%) cases. Low-grade squamous epithelial or higher grade lesions were detected with at least one of the methods in 59 cases and with both methods in 42 cases. Fifteen more cases of low-grade squamous epithelial or higher grade lesions (58 vs 43; p < 0.001) and 10 more cases of high-grade squamous epithelial lesions or carcinoma (42 vs 32; p = 0.006), were detected with ThinPrep than with conventional smears. The ThinPrep method yielded a higher rate of specimens that were satisfactory for cytologic examination than the conventional smears (89.8% vs 70.9%, p < 0.001). The detection rate of infectious agents was also higher with the ThinPrep method (14.9% vs 6.6%; p < 0.001). The reproducibility rate of the twin slides prepared with the ThinPrep method was greater than 99%. In conclusion, the ThinPrep method yielded a significantly higher positive detection rate of cervical abnormalities and more satisfactory specimens than conventional Papanicolaou smears.

Androgen receptor gene mutations in 46,XY females with germ cell tumours

We present clinical findings and molecular characterization in two patients previously diagnosed as 46,XY female gonadal dysgenesis with germ cell tumour. Both patients showed a female general phenotype with unambiguously female external genitalia and primary amenorrhoea compatible with complete androgen insensitivity syndrome. The first patient, at the age of 31 years, developed a dysgerminoma measuring 8 x 13 x 10 cm in one abdominal testis. Genetic analysis revealed a single nucleotide substitution on exon 4 in the hormone-binding domain of the androgen receptor (AR) gene, resulting in a change of codon 681 GAG (glutamic acid) to AAG (lysine). The second patient, at the age of 17 years, developed a dysgerminoma measuring 12 x 10 x 7 cm in one abdominal testis and gonadoblastoma in the other testis. Genetic analysis showed a point mutation on exon 3 in the DNA-binding domain of the AR gene resulting in a change of codon 607 CGA (arginine) to CAA (glutamine). Arg607-Gln and Arg608-Lys point mutations in the DNA-binding domain of the AR gene have been associated with male breast cancer in partial androgen insensitivity syndrome. A codon 607 mutation in the DNA-binding domain of the AR gene in our patient 2 is associated with early development of germ cell tumour. We suggest regular molecular genetic analysis of the AR gene in 46,XY females with germ cell tumour and androgen insensitivity syndrome to detect differences in the specific regions of AR gene involved in early progression toward oncogenesis of the dysgenetic gonads.

Comparison of pylorus-preserving and classic pancreaticoduodenectomy

BACKGROUND

The authors present their recent experience with the treatment of periampullary lesions to compare the surgical technique, safety and prognosis between pylorus-preserving pancreaticoduodenectomy (PPPD) and classic pancreaticoduodenectomy (CPD).

METHODS

Prospective data from 100 patients with periampullary lesions treated with either PPPD or CPD between January, 1991, and June, 1997, were evaluated, including demographic data, surgical technique, surgical risk and prognosis.

RESULTS

There were 35 patients treated with PPPD and 65 treated with CPD. The operating time was significantly shorter in the PPPD group (9.3 +/- 0.3 hours) than in CPD (10.4 +/- 0.3 hours). The average overall blood loss was 1,275 +/- 71 ml, with no statistical difference between PPPD and CPD groups. The overall complication rate was 56%, with 54% in the PPPD group and 57% in the CPD group (p = 0.755). The overall mortality was 4%, with 0% in the PPPD group and 6.2% in CPD (p = 0.655). There was no statistical difference in survival time for overall periampullary cancers between the PPPD and CPD groups (median = 28.0 vs 26.5 months, p = 0.393). The difference in survival time was still of no significance between the PPPD and CPD groups when the periampullary cancers were further stratified into pancreatic head cancer and nonpancreatic periampullary cancer.

CONCLUSIONS

Morbidity and mortality of PPPD did not exceed that of CPD, and the prognosis after PPPD was not compromised in patients with periampullary cancer. PPPD, with a shorter operating time, can be a safe and effective alternative to CPD in the treatment of periampullary lesions.

Temperature-Dependent Line Shift and Broadening of CO Infrared Transitions

The temperature dependence of lineshift and broadening of the rovibrational transitions R(18) and R(20) of the CO fundamental band, perturbed by Ar, N2, O2, and H2, have been measured with high frequency accuracy and at temperatures between 160 and 270 K in steps of 20 K. A wavelength stabilized tunable diode laser spectrometer has been combined with a low temperature long path cell of 134 m absorption length and 1 m basis length. For all measurements the CO pressure was below 0.1 mbar to avoid self-shift and self-broadening. In case of line broadening the temperature dependence is quite well reproduced by an exponential relation, b(T) = b(T0)(T/T0)-n. For all foreign gases, the exponent n has been obtained (0.53 </= n </= 0.71) and a value for air has been calculated from the weighted mean values of N2 and O2. Within the error limits the magnitudes of all shifts decrease with increasing temperatures, but there is no exponential behavior of the shift versus temperature. The line broadening and shift for CO with Ar and the broadening of CO by N2 and O2 have been compared to calculations from the semi-classical theory of Robert and Bonamy. Sufficient agreement has been achieved for the line broadening, while the calculated shifts are for all temperatures larger than the measured values. Copyright 1998 Academic Press.

Is the short insulin tolerance test safe and reproducible?

The short insulin tolerance test (SITT) is described as a simple method to measure insulin sensitivity. To investigate the safety and reproducibility of the SITT, 16 healthy volunteers underwent two SITTs within 1 week. Intravenous insulin (0.05 U kg(-1) body weight) was injected into an antecubital vein. Blood samples were collected from the contralateral antecubital vein. The insulin-induced glucose disposal rate (Kitt) was calculated from the slope of the regression line of the logarithm of blood glucose against time during the first 3-15 min. Plasma glucose concentrations fell below 2.8 mmol l(-1) in 4 of the 32 tests and below 2.2 mmol I(-1) in 1 of these 4. Five subjects had mild hypoglycaemic symptoms, three of whom had plasma glucose concentrations below 2.8 mmol l(-1) in at least one SITT. The mean Kitt was 4.2% min(-1) (range 0.8-8.4) for the first test and 3.4% min(-1) (range 0.1-6.8) for the second test. The mean within-subject coefficient of variation was 30.7%. We conclude that SITT should be applied with caution especially on insulin sensitive subjects and has poor reproducibility using 0.05 U kg(-1) body weight of insulin injection, venous sampling, uncontrolled physical activity and uncontrolled dietary composition. Whether 0.1 U kg(-1) body weight of insulin injection and arterialized venous blood sampling as in the original description of this test can improve the reproducibility of the SITT needs further investigation.

Accuracy of frozen section diagnosis in gynecology

OBJECTIVE

A retrospective study was undertaken to evaluate the accuracy of frozen section diagnosis in gynecological surgery.

METHODS

We compared the results of 792 consecutive gynecological frozen section diagnoses with their final diagnoses from January 1991 to June 1996. Slides for which the frozen section diagnosis was uncertain or incompatible with the final diagnosis were reviewed by an attending pathologist to determine the possible causes.

RESULTS

A total of 299 ovarian, 390 lymph node, 56 uterine lesions, and 77 other tissue samples were obtained. The frozen section diagnosis was compatible with the final diagnosis in 97.5% of cases. The sensitivity for nonbenign lesions was 90.9%, and the specificity was 99.5%. There were no false positives or overestimated cases; 1.3% of cases were falsely negative, 0.4% underestimated the degree of malignancy, and 0.9% were uncertain. Possible causes for incompatible or uncertain frozen section diagnoses were analyzed. The accuracy of frozen section diagnoses for ovarian, lymph node, uterine, and other tissues was also evaluated. Frozen section was found to identify correctly 13 of 17 ovarian malignancies metastaic from other organs, 14 of 15 germ cell malignancies, and 3 of 4 dysgerminomas. The low sensitivity in ovarian borderline malignancy was due to the even lower sensitivity in its mucinous subgroup. The relationship between section numbers and accuracy of frozen section diagnosis in mucinous ovarian tumors was assessed.

CONCLUSIONS

Frozen section diagnosis in gynecology is sufficiently accurate for clinical use, with a low false negative rate and an even lower false positive rate. Most incompatible frozen section diagnoses occurred in ovarian lesions, especially in mucinous ovarian tumors. Performing multiple sections (at least one section for every 10 cm in diameter) is recommended in the frozen section diagnosis of mucinous ovarian tumors.

Effects of puerarin against glutamate excitotoxicity on cultured mouse cerebral cortical neurons

AIM

To study the effects of puerarin (Pue) against injury of cultured neurons by sodium glutamate (Glu).

METHODS

Neuronal damage induced by Glu, N-methyl-D-asparate (NMDA), and kainic acid (KA), as well as the actions of Pue and some excitatory amino acid antagonists (EAAA), were measured by determining the leakage of lactate dehydrogenase (LDH) from nerve cells.

RESULTS

The 24-h leakage of LDH was increased from cells exposed either to Glu 100 and 500 mumol.L-1 for 15 min (from 20 +/- 4 kU/g protein in control group to 35 +/- 3 kU/g protein in Glu 100 mumol.L-1 group and to 46 +/- 6 kU/g protein in Glu 500 mumol.L-1 group) or to NMDA 500 mumol.L-1 or KA 500 mumol.L-1 for 45 min (from 19 +/- 4 kU/g protein in control group to 27 +/- 3 kU/g protein in NMDA group and to 30 +/- 5 kU/g protein in KA group). Pre and post-treatment with Pue (100 mumol.L-1) decreased the leakage of LDH, which was similar to the effects of EAAA kynurenic acid (from 35 +/- 3 kU/g protein in Glu 100 mumol.L-1 to 20 +/- 5 kU/g protein in kynurenic acid group and to 22 +/- 3 kU/g protein in Pue group), DL-2-amino-5-phosphonovaleric acid (APV) (from 27 +/- 3 kU/g protein in NMDA damaged group to 183 kU/g protein in APV group and to 19 +/- 5 kU/g protein in Pue group) or 6,7-dinitroquinoxaline-2,3(1H,4H)-diane (DNQX) (from 30 +/- 5 kU/g protein in KA damaged control to 22 +/- 5 kU/g protein in DNQX group and to 20 +/- 4 kU/g protein in Pue group). Post-treatment with Pue (100 mumol.L-1) was able to reduce 24-h leakage of LDH from neurons expos ed to Glu 100 mumol.L-1 for 15 min (from 35 +/- 3 kU/g protein to 27 +/- 4 kU/g protein).

CONCLUSION

Pue had protective effects on neurons damaged by Glu, NMDA, or KA.

Metastatic leiomyosarcoma of the thyroid: a case report

Metastatic malignant tumors of the thyroid are rarely encountered clinically. Most arise from primary sites in the lung, breast, kidney or gastrointestinal tract. Their clinical presentation may mimic a primary thyroid tumor and include signs and symptoms such as enlargement of the neck, hoarseness and dysphagia. Without a history of carcinoma in other organs, management as for primary thyroid tumor is often undertaken and misdiagnosis is common. This report concerns a 63-year-old female patient with a rapidly progressive enlargement of the neck. She had had a primary leiomyosarcoma lesion in her left leg that had been well controlled after wide excision. Bilateral pulmonary metastases were noted two years later without local recurrence. She receive wedge lung resections several times. To relieve progressive shortness of breath, debulking surgery of the thyroid was performed and metastatic leiomyosarcoma was proved. The related clinical data of this rare metastatic leiomyosarcoma of the thyroid is presented and the literature is reviewed.

Sonographic findings in a fetus with megacystis-microcolon-intestinal hypoperistalsis syndrome

We describe the perinatal findings in a female fetus with megacystis-microcolon-intestinal hypoperistalsis syndrome (MMIHS). Prenatal sonography performed during 18-21 weeks' gestation showed a normal amount of amniotic fluid, but the fetus was seen to have a persistently distended stomach, a hugely distended bladder, and bilateral dilated renal calyces. Genetic analysis of amniotic fluid revealed a 46,XX karyotype. The pregnancy was terminated at 22 weeks' gestation. At necropsy, the fetus was found to have prune-belly syndrome, gastric dilatation, pronounced megacystis, bilateral hydronephrosis and megaureters, short bowel, microileum, microcolon, and malrotation of the intestines. This fetus showed the typical clinical and sonographic features of MMIHS, as well as the rare antenatal finding of persistent gastric distention.

12-O-Tetradecanoylphorbol-13-acetate (TPA)-induced increase in depressed white blood cell counts in patients treated with cytotoxic cancer chemotherapeutic drugs

Fifty-two patients with solid tumors had depressed white blood cell and neutrophil counts because of prior treatment with cytotoxic cancer chemotherapeutic drugs. These patients were given one or more i.v. infusions of 0.125-0.25 mg of 12-O-tetradecanoylphorbol-13-acetate (TPA), and this treatment increased the low white blood cell and neutrophil counts toward the normal range. The average white blood cell and neutrophil counts were 2.55 x 10(9)/liter and 1.76 x 10(9)/liter, respectively, before treatment with TPA. After one or more i.v. infusions of TPA, the white blood cell and neutrophil counts increased to peak values of 5. 92 x 10(9)/liter and 4.76 x 10(9)/liter, respectively, within a few days. Most patients had increased levels of white blood cells and neutrophils by 24 hr after a single i.v. infusion of 0.25 mg TPA. Elevated levels were observed for at least 3 days. This study demonstrates that treatment with parenteral TPA is feasible with useful biological activity. Only mild and reversible side effects were observed.

Pregnancy with concomitant chorangioma and placental vascular malformation with mesenchymal hyperplasia

We present two pregnancies associated with normal live births and the unusual concomitance of chorangioma and placental vascular malformation with mesenchymal hyperplasia. The enlarged placenta had the characteristic findings of chorangioma, dilated and varicose chorionic vessels and multiple vesicle-like villi containing hyaluronic acid. The vesicle-like villi showed diploid cellular DNA contents. Molecular genetic analysis using the polymerase chain reaction amplification of polymorphic microsatellite markers confirmed genetic identity among the chorangioma, the vesicle-like villi and the fetus. Both pregnancies were complicated by polyhydramnios, pre-term labour and prematurity. One neonate suffered from anaemia and thrombocytopenia. Another neonate suffered from haemangiomatosis. Our cases demonstrate that concomitant chorangioma and placental mesenchymal hyperplasia are genetically identical to the fetus and can coexist with a normal viable fetus. Since haemangiomas, chorangiomas, chorionic vessels and villi mesenchymal cells are all derived from the mesoderm, a combination of fetal haemangiomas, placental vascular malformation, chorangiomas and placental mesenchymal hyperplasia may represent a mixed form of congenital malformation of the mesoderm.

Association between Epstein-Barr virus and Burkitt's lymphoma in Taiwan

BACKGROUND

The association between Epstein-Barr virus (EBV) and Burkitt's lymphoma (BL) in Taiwan is not clear. In this study, the authors attempted to determine the frequency of the occurrence of EBV infection in patients with BL in Taiwan.

METHODS

A retrospective study was performed using a nonisotopic in situ hybridization technique to detect the presence of EBV-encoded small RNAs (EBERs) in paraffin embedded BL tissues. Tissues of other types of B-cell non-Hodgkin's lymphoma (NHL) were used as controls. Immunohistochemical staining was performed to examine the presence of an EBV-encoded protein, latent membrane protein (LMP), and p53 in specimens.

RESULTS

EBERs were detectable in 10 of 18 BL specimens. It was present in the cervical lymph nodes (LNs) in six of the seven cases of cervical tumors, in the maxillary region in one case, in one of two cases of axillary LNs, and in the abdominal tumors in two of the seven cases of intraabdominal disease. EBER positive cells were diffusely present in all tumors except in one abdominal BL, in which only a few EBER positive cells were scattered in a small part of the tumor. EBER positive cells were not detected in the case with BL in an inguinal LN and in the seven cases with intraabdominal tumors. Immunohistochemical studies showed that LMP and p53 were expressed in 3 and 4 of the 18 cases, respectively. In another 20 NHLs in peripheral LNs, EBERs were detectable in only 1 case of diffuse large cell histology with numerous reactive T cells in which only large tumor cells expressed EBERs and LMP. EBERs were not detected in any of the ten cases of extranodal NHL.

CONCLUSIONS

In Taiwan, EBV is frequently associated with BL occurring outside the abdomen but rarely with intraabdominal BL. The overall association between EBV and BL in Taiwan is intermediate compared with other regions of the world. These results support the theory that the frequency of EBV associated with BL is influenced by the endemicity of EBV and/or the socioeconomic status of a country.

[The study on the epidemiological features and risk factor of Chlamydia trachomatis reproductive tract infection (CTRTI) among 664 married women at reproductive age in rural areas]

The infection rate and risk factors of CTRTI among 664 married women at reporductive age in rural areas in Chengjiang county, Yunnan province were investigated. Specimens of cervical swab were detected for CT antigen using Chlamydia EIA(Syva co., USA). The selection of major risk factors was through Logistic regression and chi 2-test. The results showed that the overall infection rate of CTRTI was 5.0%, with 60.6% of these cases asymptomatic. The major risk factors include: spouse who has symptoms of RTIs; history of others vaginitis; divorce; habit of washing face, feet and vulva with the same wash basin; age of menarche; amenorrhoea during lactation; low education and living in poverty.

Mite-induced allergic airway inflammation in guinea pigs

BACKGROUND

Mites are the most common aeroallergen in human allergic asthma. However, no animal model of mite-induced allergic airway inflammation has been reported before. In this study, an animal model of mite-induced allergic airway inflammation in guinea pigs was developed.

METHODS

Firstly, we found that two intraperitoneal injections of 100 micrograms crude mite extract (CME), but not multiple aerosol inhalations of 10 mg/ml CME, can cause sensitization in guinea pigs. The sensitization to mites was confirmed by the measurement of serum antimite antibody titer and the detection of anaphylactic bronchoconstriction after intravenous injection of CME solution. Then, single or multiple aerosol challenges with different concentrations (8, 4 or 1 mg/ml) of CME in these sensitized animals were performed. The total white cell and differential counts in the bronchoalveolar lavage (BAL) fluids were studied at different time intervals after challenge in different animals, and tracheal pathology was performed to detect the allergic airway inflammation. For comparison with the study in animals treated with CME, a BAL study in animals treated with ovalbumin was also performed.

RESULTS

The inhalation challenge of CME aerosol in sensitized animals caused prolonged eosinophilia in BAL fluid which persisted for at least 7 days after single challenge. Neither inhalation challenge at higher concentrations of CME aerosol nor repeated inhalation challenges increased the degree of eosinophilia in BAL fluid compared to a single challenge. Using the same procedures, we also found that the mite model caused more eosinophilia in BAL fluid than did ovalbumin.

CONCLUSION

This is the first report of an animal model of mite-induced allergic airway inflammation in guinea pigs which can provide us with a useful model to study airway inflammation of mite-induced asthma in humans.

Cutis marmorata telangiectatica congenita associated with an elevated maternal serum human chorionic gonadotrophin level and transitory isolated fetal ascites

A 34-year-old woman with an abnormal maternal serum screening result and a Down syndrome risk of 1:60 calculated from a maternal serum alpha-fetoprotein (AFP) value of 1.4 multiples of the median (MoM) and a human chorionic gonadotrophin (hCG) level of 4.32 MoM at 18 weeks' gestation was found to have isolated fetal ascites at 23 weeks' gestation. Spontaneous resolution occurred 10 weeks after the initial presentation. After birth, the neonate had generalized cutis marmorata telangiectatica congenita (CMTC), large vascular plaques on the scalp with superficial ulceration and crusts, a small atrial septal defect, a patent ductus arteriosus, hepatomegaly, micrognathia, seizures, an abnormal electroencephalogram, congenital retinal detachment, glaucoma and widely spaced toes. Our patient illustrates that CMTC in utero may be associated with a markedly elevated maternal serum hCG level as well as transitory isolated fetal ascites. However, such associations can be coincidental and further collaborative studies and cases will be necessary before it can be determined that a disproportionately elevated hCG level and transitory isolated fetal ascites are predictive of CMTC in utero.

Prenatal diagnosis, pathology, and genetic study of fetus in fetu

We report the prenatal diagnosis, pathology, cytogenetics, and molecular studies of a retroperitoneal fetus in fetu. Prenatal ultrasonography of the host fetus in the third trimester showed an anencephalic, acardiac mass with identifiable extremities and spine within an intra-abdominal cystic mass. Pathological examination revealed a fetiform mass weighing 20 g with four extremities, digits, vertebral bodies, an oral cavity with developing teeth, primitive male external genitalia, a urinary bladder, a cloaca with an external opening, large intestines, a membranous capsule, and an umbilical cord with one artery, one vein, and Wharton's jelly. Histological examination demonstrated nerve bundles in the fibrocollagenous tissue below the cuboidal surface epithelium of the membranous capsule, and absence of lamina elastica interna and vasa vasorum in the single artery of the umbilical cord. Both the host infant and the fetus in fetu had a normal 46,XY karyotype. Molecular analysis using informative genetic markers showed no genetic difference between the host infant and the fetiform mass. We report this case as an unusual example of fetus in fetu in co-existence with an amnion-like membrane containing nerve bundles and with a well-formed umbilical cord. We demonstrate that fetus in fetu can be diagnosed prenatally if the fetiform mass has well-developed limbs and spine. We emphasize the necessity for suspicion of fetus in fetu when a well-defined encapsulated cystic mass with calcified solid components is detected prenatally in a fetus by ultrasonography.

Hirschsprung's disease manifested with obstructive colitis in adult: a case report

Hirschsprung's disease rarely occurs in adult. If it occurs, the symptoms and signs are usually milder than those in children and manifest in form of chronic or intermittent constipation. Definite surgical intervention could be performed with good results. We reported a 36-year-old male adult with Hirschsprung's disease who manifested as obstructive colitis. The clinical course presented as abdominal fullness and pain, and colonoscopy revealed ulcerations and pseudopolyps formation in the sigmoid colon and rectum. Ganglion was absent in transanal rectal biopsy. Soave's procedure with protective ileostomy was done. Patient's bowel movements turned normal after closure of ileostomy three months later. The literature was also reviewed.

Surgical management of primary retroperitoneal sarcoma

BACKGROUND

Retroperitoneal sarcoma is a rare and challenging group of diseases for surgeons, characterized by extensive growth and high recurrent rate. We analyzed data from our patients to identify the factors of survival.

METHODS

From 1971 to 1993, medical records of 40 patients with primary retroperitoneal sarcoma were reviewed. Clinical factors including age, sex, tumor size, histopathology, type of operation, disease-free interval, and number of operation were collected to correlate with patient's survival.

RESULTS

Most patients presented with huge abdominal mass. There were 22 liposarcomas, 8 leiomyosarcomas, 5 malignant fibrous histiocytomas, 2 fibrosarcomas, 2 malignant mesenchymomas and one rhabdomyosarcoma. Twenty-eight patients received complete resection and 12 had incomplete resection. The group with complete resection showed a better survival than incomplete resection group (p = 0.0001). Nineteen patients with complete resection had tumor recurrence. The recurrent rate was 68%. Patients having been disease-free for more than 12 months showed to have better survival than those less than 12 months (p = 0.005). Aggressive surgical resection was done in case of tumor recurrence. Patients who received more than 2 (> or = 3) operations also showed a better survival than those with less than 2 operations (p = 0.0247).

CONCLUSIONS

Complete surgical resection and aggressive repeated surgical intervention are the most effective treatment modality for better survival in patients with retroperitoneal sarcoma.