High-Strength Collagen-Based Composite Films Regulated by Water-Soluble Recombinant Spider Silk Proteins and Water Annealing

Spider silk has attracted extensive attention in the development of high-performance tissue engineering materials because of its excellent physical properties, biocompatibility, and biodegradability. Although high-molecular-weight recombinant spider silk proteins can be obtained through metabolic engineering of host bacteria, the solubility of the recombinant protein products is always poor. Strong denaturants and organic solvents have thus had to be exploited for their dissolution, and this seriously limits the applications of recombinant spider silk protein-based composite biomaterials. Herein, through adjusting the temperature, ionic strength, and denaturation time during the refolding process, we successfully prepared water-soluble recombinant spider major ampullate spidroin 1 (sMaSp1) with different repeat modules (24mer, 48mer, 72mer, and 96mer). Then, MaSp1 was introduced into the collagen matrix for fabricating MaSp1-collagen composite films. The introduction of spider silk proteins was demonstrated to clearly alter the internal structure of the composite films and improve the mechanical properties of the collagen-based films and turn the opaque protein films into transparency ones. More interestingly, the composite film prepared with sMaSp1 exhibited better performance in mechanical strength and cell adhesion compared to that prepared with water-insoluble MaSp1 (pMaSp1), which might be attributed to the effect of the initial dissolved state of MaSp1 on the microstructure of composite films. Additionally, the molecular weight of MaSp1 was also shown to significantly influence the mechanical strength (enhanced to 1.1- to 2.3-fold) and cell adhesion of composite films, and 72mer of sMaSp1 showed the best physical properties with good bioactivity. This study provides a method to produce recombinant spider silk protein with excellent water solubility, making it possible to utilize this protein under environmentally benign, mild conditions. This paves the way for the application of recombinant spider silk proteins in the development of diverse composite biomaterials.

Enhanced anticoagulant activity of hirudin-i analogue co-expressed with arylsulfotransferase in periplasm of E. coli BL21(DE3)

Hirudin, a blood anticoagulant, is the most potent natural thrombin inhibitor of leech origin. Its application is limited because it is difficult to obtain abundant natural hirudin directly from the leech. Although some bioengineering methods can significantly increase the production of hirudin, the reduced efficacy of recombinant hirudin (rH) remains a critical shortcoming. The lack of sulfation of tyrosine 63 in rH is an important cause of its inadequate performance. This article is the first report of periplasmic co-expression of an rH-I analogue with arylsulfotransferase (ASST) in E. coli BL21(DE3). Co-expressed rH-I analogue with sulfate donor substrate (p-nitrophenyl sulfate potassium) showed anticoagulant (rabbit and goat serum) activity twice more than rH-I analogue expressed without ASST, indicating its potential periplasmic sulfation. Moreover, purified rH-I analogue showed above 4.5 times higher anticoagulant activity compared to therapeutic anti-thrombotic heparin (HE). At the same time, pH-dependent differential solubility was employed to purify rH analogues from fermentation broth, which is a simple, fast and inexpensive purification technology, and can potentially be used for larger scale purification. This will also greatly improve the application of rH in clinical treatment.

The promising indicators of the thermal and mechanical properties of collagen from bass and tilapia: synergistic effects of hydroxyproline and cysteine

Hydroxyproline and cysteine have a synergistic effect on both the thermal and mechanical properties of fish collagen hydrogels.

Traumatic Diaphragmatic Hernia: Diagnostic Dilemma

Traumatic rupture of the diaphragm is an uncommon condition. The prevalence of diaphragmatic rupture among blunt trauma victim ranges from 0.8 to 8%. The etiologic factors are blunt trauma (for example, in motor vehicle accidents) and penetrating trauma. The diagnosis is often missed because of non-specific clinical signs, and the absence of additional intra-abdominal and thoracic injuries. We present a case which was misdiagnosed as a case of left sided hemopneumothorax and treated with tube thoracotomy in other center.

Comprehensive review of BAP1 tumor predisposition syndrome with report of two new cases

The BRCA1-associated protein-1 (BAP1) tumor predisposition syndrome (BAP1-TPDS) is a recently identified hereditary cancer syndrome. Germline mutations in this tumor suppressor gene predispose families to the development of various malignancies. The molecular functions of the gene as well as the clinical phenotype of the syndrome are still being clarified. We sought to conduct a comprehensive review of published research into BAP1-TPDS to more thoroughly delineate the clinical implications of germline BAP1 mutations. We also report two additional families with germline BAP1 mutations. Current evidence demonstrates that germline BAP1 mutations predispose families to uveal melanoma, renal cell carcinoma, malignant mesothelioma, cutaneous melanoma, and possibly to a range of other cancers as well. Some of these cancers tend to be more aggressive, have a propensity to metastasize, and onset earlier in life in patients with BAP1 mutations as compared to non-predisposed patients with equivalent cancers. Although further research is necessary, this information can aid in the management, diagnosis, and therapy of these patients and their families, and highlights the importance of genetic counseling.

Reliability, validity, and responsiveness of the Western Ontario and McMaster Universities Osteoarthritis Index for elderly patients with a femoral neck fracture

BACKGROUND

The Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) has been extensively evaluated in groups of patients with osteoarthritis, yet not in patients with a femoral neck fracture. This study aimed to determine the reliability, construct validity, and responsiveness of the WOMAC compared with the Short Form-12 (SF-12) and the EuroQol 5D (EQ-5D) questionnaires for the assessment of elderly patients with a femoral neck fracture.

METHODS

Reliability was tested by assessing the Cronbach alpha. Construct validity was determined with the Pearson correlation coefficient. Change scores were calculated from ten weeks to twelve months of follow-up. Standardized response means and floor and ceiling effects were determined. Analyses were performed to compare the results for patients less than eighty years old with those for patients eighty years of age or older.

RESULTS

The mean WOMAC total score was 89 points before the fracture in the younger patients and increased from 70 points at ten weeks to 81 points at two years postoperatively. In the older age group, these scores were 86, 75, and 78 points. The mean WOMAC pain scores before the fracture and at ten weeks and two years postoperatively were 92, 76, and 87 points, respectively, in the younger age group and 92, 84, and 93 points in the older age group. Function scores were 89, 68, and 79 points for the younger age group and 84, 71, and 73 points for the older age group. The Cronbach alpha for pain, stiffness, function, and the total scale ranged from 0.83 to 0.98 for the younger age group and from 0.79 to 0.97 for the older age group. Construct validity was good, with 82% and 79% of predefined hypotheses confirmed in the younger and older age groups, respectively. Responsiveness was moderate. No floor effects were found. Moderate to large ceiling effects were found for pain and stiffness scales at ten weeks and twelve months in younger patients (18% to 36%) and in the older age group (38% to 53%).

CONCLUSIONS

The WOMAC showed good reliability, construct validity, and responsiveness in both age groups of elderly patients with a femoral neck fracture who had been physically and mentally fit before the fracture. The instrument is suitable for use in future clinical studies in these populations.

CLINICAL RELEVANCE

The results are based on two clinical trials. The questionnaires used concern pure, clinically relevant issues (ability to walk, climb stairs, etc.). Moreover, the results can be used for future research comparing clinical outcomes (or treatments) for populations with a femoral neck fracture.

Evaluating the physicochemical properties and inorganic elements of saliva in caries-free and caries-active children. An in vivo study

AIM The purpose of this investigation is to evaluate the physicochemical properties of saliva, such as salivary flow rate, volume, pH and buffer capacity and the levels of salivary sodium, potassium, calcium and phosphate ions in caries-free and caries-active children.

MATERIALS AND METHODS

The present study included 100 healthy children aged 7-12 years belonging to a rural population from Thiruvallur district (in Chennai, India), who were divided into Group 1 caries-free and Group 2 caries-active children, of 50 children each. Unstimulated saliva was collected by draining method and flow rate and volume were determined. The samples were then analysed for pH and buffering capacity using a manual pH meter. Sodium, potassium, and calcium concentration were analysed by Flame Photometer. Phosphates were analysed by Fiske and Subbarow's colorimetric method. Data were then statistically analysed using the Student's t-test (unpaired).

RESULTS

The results revealed that when all these parameters were compared among the caries-free and caries-active children, the flow rate, volume, pH and buffering capacity were slightly reduced in the caries-active group and this was statistically significant, whereas the calcium, potassium and sodium concentrations were increased in the caries-free group in a statistically significant manner.

CONCLUSION

Within the limitation of this study, we can conclude that alterations in the physicochemical properties of saliva such as increased salivary flow rate, volume, calcium, sodium and potassium concentrations play a major role in the development of resistance to caries.

Rebamipide attenuates nonsteroidal anti-inflammatory drugs (NSAID) induced lipid peroxidation by the manganese superoxide dismutase (MnSOD) overexpression in gastrointestinal epithelial cells

Nonsteroidal anti-inflammatory drugs (NSAIDs) often cause gastrointestinal complications such as gastric ulcers and erosions. Recent studies on the pathogenesis have revealed that NSAIDs induce lipid peroxidation in gastric epithelial cells by generating superoxide anion in mitochondria, independently with cyclooxygenase-inhibition and the subsequent prostaglandin deficiency. Although not clearly elucidated, the impairment of mitochondrial oxidative phosphorylation, or uncoupling, by NSAIDs is associated with the generation of superoxide anion. Physiologically, superoxide is immediately transformed into hydrogen peroxide and diatomic oxygen with manganese superoxide dismutase (MnSOD). Rebamipide is an antiulcer agent that showed protective effects against NSAID-induced lipid peroxidation in gastrointestinal tracts. We hypothesized that rebamipide may attenuate lipid peroxidation by increasing the expression of MnSOD protein in mitochondria and decreasing the leakage of superoxide anion in NSAID-treated gastric and small intestinal epithelial cells. Firstly, to examine rebamipide increases the expression of MnSOD proteins in mitochondria of gastrointestinal epithelial cells, we underwent Western blotting analysis against anti-MnSOD antibody in gastric RGM1 cells and small intestinal IEC6 cells. Secondly, to examine whether the pretreatment of rebamipide decreases NSAID-induced mitochondrial impairment and lipid peroxidation, we treated these cells with NSAIDs with or without rebamipide pretreatment, and examined with specific fluorescent indicators. Finally, to examine whether pretreatment of rebamipide attenuates NSAID-induced superoxide anion leakage from mitochondria, we examined the mitochondria from indomethacin-treated RGM1 cells with electron spin resonance (ESR) spectroscopy using a specific spin-trapping reagent, CYPMPO. Rebamipide increased the expression of MnSOD protein, and attenuated NSAID-induced mitochondrial impairment and lipid peroxidation in RGM1 and IEC6 cells. The pretreatment of rebamipide significantly decreased the signal intensity of superoxide anion from the mitochondria. We conclude that rebamipide attenuates lipid peroxidation by increasing the expression of MnSOD protein and decreasing superoxide anion leakage from mitochondria in both gastric and small intestinal epithelial cells.

Running with the hares and hunting with the hounds: an impossibility?

Vascular surgery has emerged as an independent speciality in India. The growth and development of vascular surgery in India has been slow, yet steady. It is a matter of concern that almost a quarter century down the line this speciality is faced with several problems. This article examines the issue of whether it is feasible for vascular surgery to exist as an independent subspeciality. Does one follow a conciliatory or a confrontational approach with the 'competing specialities'?

Prevalence of immediate vasovagal reaction in blood donors visiting two blood banks of Karachi

Vasovagal reaction (VVR) is a very common adverse event related to blood donation. No study has been conducted in Pakistan to estimate the prevalence of VVR in blood donors. This study was conducted to estimate the prevalence of immediate VVR in blood donors of Karachi, Pakistan. The study was conducted in two blood banks of Karachi. Data regarding the development of immediate VVR were documented. The effect of blood donation on vital parameters like pulse rate, blood pressure (BP), temperature and respiratory rate was also observed. Six hundred and seventy-four blood donors were recruited. All the donors who consented were males. Weakness and dizziness were two most common symptoms which were reported by 91 (13.5%) and 73 (10.8%) of the participants, respectively. Out of 91 donors in whom signs and symptoms of immediate VVR were observed, a significant drop in systolic BP (13.5 +/- 2.5 mmHg) and decrease in pulse rate (13.3 +/- 3.6) were concurrently noted in 55 donors (8.2% of all the participants). There was lack of association of age, body mass index (BMI), estimated blood volume, ethnicity, educational status, profession and first time donation status with the frequency of VVR. Only marital status was found to be significantly associated with higher frequency of immediate VVR, where married donors were having higher odds as compared to singles. The prevalence of VVR in the blood donors at two blood banks of Karachi is at least 8.2%. Furthermore, married men are at more risk of experiencing VVR in our population.

The effect of alemtuzumab maintenance therapy on B and T lymphocytes in chronic lymphocytic leukemia

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Background: We are conducting a pilot, exploratory study of the potential value of alemtuzumab(alem) in maintenance therapy of previously treated chronic lymphocytic leukemia (CLL) patients(pts) after they have achieved stable disease or partial remission with chemo or chemo-immunotherapy. We present the results of serially monitored CD19+ (B)lymphocytes and CD4+ (T) lymphocytes on eight evaluable patients. Methods: 30mg doses of alem were administered SC to all patients at the following schedule: wkly for 8 doses (8 wks), followed by q2 wks for 8 doses(16 wks), followed by q3 wks for 8 doses (24 wks). This schedule provides a total of 48 wks of maintenance treatment with alem. Patients received standard prophylaxis with sulfamethoxizole and acyclovir with regular CMV monitoring by quantitative PCR. Results: In the table we present data on the pattern of decrease in blood CD19+(B) cells and CD4+ (T) cells on eight evaluable pts at different time points after starting alem maintenance. Because flow cytometry was not done on all pts at each time point, the number of pts contributing to the calculation of mean counts at each given time point is variable. CD19+(B) cells were markedly reduced to 37% of baseline consistently, from 8 wks onward. CD4+(T) cells, on the other hand, were consistently higher than 50% of the baseline after 8 wks. No opportunistic infections were seen in any pt and treatment was well tolerated. Conclusion: These results from a single institution based pilot study demonstrate that alem used in maintenance schedule is effective in keeping the blood levels of CD19+(B) cells extremely low without concordant suppression of CD4+(T) lymphocytes.

No significant financial relationships to disclose.

[Table: see text]

Impact of prognostic markers on outcomes in patients with advanced chronic lymphocytic leukemia treated with the regimen of fludarabine/rituximab plus oblimersen (Bcl-2 Antisense)

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Background: Bcl-2, an anti-apoptotic protein is associated with treatment resistance and poor prognosis in pts with chronic lymphocytic leukemia (CLL). Preclinical studies have shown that oblimersen (Obl) enhances apoptosis induced by fludarabine (Flu) and rituximab (Rit). Increased CR and nPR in a phase 3 study confirmed the clinical benefit of combining Obl with a standard Flu+cyclophosphamide regimen in relapsed or refractory CLL pts. Similarly, in a phase 2 study, we found encouraging clinical activity when Obl was added to Flu/Rit. Here we report on outcomes related to baseline prognostic markers. Methods: All patients received Flu+Rit+Obl. Pts received Obl 1.5mg/kg/d, d1–7 by continuous IV, Rit (125 mg/m2 on d4, 250 mg/m2 on d6), and Flu 25mg/m2/d, d6–8 in the 1st cycle, and Obl 3mg/kg/d and Rit 375mg/m2 on d5 only, plus Flu on d5–7 in later q28 d cycles. Baseline data were collected on baseline cytogenetics and expression of Zap-70 and CD38 expression. Results: In the initial cohort, 24 pts (19 PT, 5 UT) were treated. CD 38 over-expression, Zap-70 expression, and abnormal cytogenetics were common; normal karyotypes (NK) were observed in only 5 (3 UT, 2 PT) pts. Median number of Flu+Rit+Obl cycles was 6. Overall, 5/5 UT and 12/19 PT pts responded. Two molecular CRs were noted (by flow and IgVh gene analysis), including 1 UT (CD38+, NK) and 1 PT (13q deletion) that had been refractory to Flu+Rit+Obl. Three nPRs were noted (2 UT [both CD38 and Zap-70+; 1 trisomy 12; 1 NK], and 1 PT [13q deletion]). Two PRs were observed in pts refractory to Flu and Flu+Rit, respectively. Two PRs were observed in 2 pts with poor risk (11q-) cytogenetics. Overall, 8/10 CD38+ pts and 5/11 Zap-70+ pts responded. Conclusions: Flu+Rit+Obl is an active and tolerable regimen in CLL. Major responses were noted in Flu- and/or Rit-refractory pts. Activity is noted despite poor prognostic markers. Accrual is ongoing. Efficacy, safety, and Bcl-2 regulation data will be presented.

[Table: see text]

[Table: see text]

The evolving role of Alemtuzumab in management of patients with CLL

New insights into prognostic markers and the pathophysiology of chronic lymphocytic leukemia (CLL) are beginning to change the concept of CLL treatment. Alemtuzumab has evolved as a potent and effective therapeutic option for patients with CLL. Specifically, alemtuzumab has demonstrated substantial efficacy in fludarabine-refractory patients and has shown impressive responses when administered subcutaneously in first-line therapy. A group of experts gathered to discuss new data related to the use of alemtuzumab in CLL and to assess its place in the rapidly changing approach to treating patients with this disease. The main goals of this program were to update the management guidelines that were previously developed for alemtuzumab-treated patients and to provide community oncologists with guidance on the most effective way to integrate alemtuzumab into a CLL treatment plan.

Dermatoglyphic peculiarities in children with oral clefts

In humans, the development of the primary palate and the lip is completed by the 7th week of intra uterine life and that of secondary palate by 12th week. The dermal ridges develop in relation to the volar pads, which are formed by the 6th week of gestation and reach maximum size between 12th and 13th weeks. This means that the genetic message contained in the genome--normal or abnormal is deciphered during this period and is also reflected by dermatoglyphics. Hence this study was done in order to observe the differences in dermatoglyphic patterns between the children with oral clefts and normal children and to determine the usefulness of dermatoglyphics in studying the genetic etiology of oral clefts. Dermatoglyphic data from 50 oral cleft children and 50 normal children were collected using the ink method and comparison was done between them. In the present study, we found an increase in the ulnar loop patterns on the distal phalanges of the ten fingers, an increase in the atd angle and an increase in the fluctuating asymmetry of the atd angle in the oral cleft children which indicates the degree of developmental instability of the oral cleft individual.

Experience with Implanon in a northeast London family planning clinic

AIM

The primary objective of the study was to evaluate the continuation rates of a relatively new long-acting method of contraception, Implanon. The secondary objective was to study discontinuations related to bleeding problems and their management.

METHOD

A retrospective review of records of women fitted with Implanon was undertaken during February 2000--January 2003.

RESULTS

Results from the secondary objective will be the subject of a separate communication. Of the 147 implants fitted, 132 records could be retrieved; of these, 97% of the women had pre-insertion counselling by the clinician. The most common indications for Implanon usage were choice of a long-acting method, unhappy experience with other contraceptive methods and suboptimal compliance with contraceptive pills and injectables. The median age of fitting was 25 years and 36% of the women were nulliparous. No problems were experienced with fitting or removal of implants. Twenty (15%) women were lost to follow-up. Twenty-two implants were removed by the end of the study period, with 12 (60%) removals attributed to prolonged heavy/light bleeding. There were no known pregnancies during the study. Given that 15% of the women could not be followed up or contacted, the assumed lifetimes of Implanon using the Kaplan-Meier method are 0.90 (95% confidence interval 0.82-0.95) at 12 months, 0.80 (0.67-0.88) at 24 months and 0.75 (0.58-0.85) at 35 months. The confirmed lifetimes are 0.84 (0.71-0.91) at 12 months, 0.63 (0.42-0.78) at 24 months and 0.53 (0.28-0.73) at 35 months.

CONCLUSION

Although not free of side-effects, Implanon can be a good choice for women who are properly informed and counselled and seek long-term 'forgettable' contraception.

Campath-1H treatment of T-cell prolymphocytic leukemia in patients for whom at least one prior chemotherapy regimen has failed

PURPOSE

We conducted a retrospective analysis to evaluate the safety and efficacy of Campath-1H, an anti-CD52 humanized monoclonal antibody, in previously treated T-prolymphocytic leukemia (T-PLL) patients in a compassionate-use program.

PATIENTS AND METHODS

Seventy-six patients with T-PLL (including four chemotherapy-naive patients) received 3, 10, and 30 mg of Campath-1H on sequential days, followed by 30 mg three times weekly, as 2-hour intravenous infusions, for 4 to 12 weeks.

RESULTS

Median patient age was 60 years (range, 35 to 84). Spleen liver, lymph node, and skin involvement were present in 64%, 40%, 54%, and 18% of patients, respectively. All tested patients had CD2, CD7, CD4, and/or CD8 positivity, whereas CD5 and CD3 were positive in 98% and 96% of tested patients, respectively. The objective response rate was 51% (95% confidence interval [CI], 40% to 63%), with a 39.5% complete response (CR) rate (95% CI, 28% to 51%). The median duration of CR was 8.7 months (range, 0.13+ to 44.4), and median time to progression was 4.5 months (range, 0.1 to 45.4) compared with 2.3 months (range, 0.2 to 28.1) after first-line chemotherapy. The median overall survival was 7.5 months (14.8 months for CR patients). The most common Campath-1H-related adverse events were acute reactions during or immediately after infusions. Fifteen infectious episodes occurred during treatment in 10 patients (13%), leading to treatment discontinuation in three. Eight patients experienced possibly related, late-onset infections. Severe thrombocytopenia and/or neutropenia occurred in six patients (8%), leading to treatment discontinuation in four. Two treatment-related deaths occurred.

CONCLUSION

Campath-1H is an active drug in T-PLL patients for whom first-line therapy has failed. It has a favorable risk/benefit ratio and should be prospectively investigated in chemotherapy-naive patients.

Campath-1H treatment of T-cell prolymphocytic leukemia in patients for whom at least one prior chemotherapy regimen has failed

PURPOSE

We conducted a retrospective analysis to evaluate the safety and efficacy of Campath-1H, an anti-CD52 humanized monoclonal antibody, in previously treated T-prolymphocytic leukemia (T-PLL) patients in a compassionate-use program.

PATIENTS AND METHODS

Seventy-six patients with T-PLL (including four chemotherapy-naive patients) received 3, 10, and 30 mg of Campath-1H on sequential days, followed by 30 mg three times weekly, as 2-hour intravenous infusions, for 4 to 12 weeks.

RESULTS

Median patient age was 60 years (range, 35 to 84). Spleen liver, lymph node, and skin involvement were present in 64%, 40%, 54%, and 18% of patients, respectively. All tested patients had CD2, CD7, CD4, and/or CD8 positivity, whereas CD5 and CD3 were positive in 98% and 96% of tested patients, respectively. The objective response rate was 51% (95% confidence interval [CI], 40% to 63%), with a 39.5% complete response (CR) rate (95% CI, 28% to 51%). The median duration of CR was 8.7 months (range, 0.13+ to 44.4), and median time to progression was 4.5 months (range, 0.1 to 45.4) compared with 2.3 months (range, 0.2 to 28.1) after first-line chemotherapy. The median overall survival was 7.5 months (14.8 months for CR patients). The most common Campath-1H-related adverse events were acute reactions during or immediately after infusions. Fifteen infectious episodes occurred during treatment in 10 patients (13%), leading to treatment discontinuation in three. Eight patients experienced possibly related, late-onset infections. Severe thrombocytopenia and/or neutropenia occurred in six patients (8%), leading to treatment discontinuation in four. Two treatment-related deaths occurred.

CONCLUSION

Campath-1H is an active drug in T-PLL patients for whom first-line therapy has failed. It has a favorable risk/benefit ratio and should be prospectively investigated in chemotherapy-naive patients.

Reversal of paclitaxel induced neutropenia by Withania somnifera in mice

The effect of aqueous extract of Withania somnifera (L. Solanaceae) was studied against paclitaxel induced neutropenia in mice. After paclitaxel 1 mg/kg, i.v. administration significant fall in total WBC and absolute neutrophil count was observed on day 3 and day 5. W. Somnifera (200 mg/kg, p.o.) per se produced significant increase in neutrophil counts. W. somnifera (200 mg/kg, p.o.) when administered for 4 days before paclitaxel treatment and continued for 12 days caused significant reversal of neutropenia of paclitaxel. The findings of the study suggest the potential of W. somnifera as an adjuvant during cancer chemotherapy for the prevention of bone marrow depression associated with anticancer drugs.

Prevalence of HTLV-I-associated T-cell lymphoma

In order to assess the prevalence rate of HTLV-1-associated T-cell lymphomas and human retrovirus infection in general, approximately 21,000 individuals representing various patient populations, retroviral risk groups, and blood donors were examined for HTLV-I, HTLV-II, HIV-1, or HIV-2 infection using serologic and PCR assays. The prevalence rates among volunteer blood donors were 0.02% and 0% for HTLV and HIV, respectively. Significantly increased HTLV prevalence rates were observed among paid blood donors, African American health care clinic patients, Amerindians, recipients of HTLV-positive cellular blood products, intravenous drug users, sexual contacts and family members of HTLV-positive people, and patients with primary thrombocytosis and other-than-low-grade non-Hodgkin's lymphoma (NHL). Among some of these groups there were significant differences in the prevalence of HTLV-I versus HTLV-II. The eight HTLV-positive NHL patients all had mature, high-grade, CD4+ T-cell lymphomas with clonally integrated HTLV-I, for a prevalence of 4% among other-than-low-grade NHL patients. Seven of the eight died from their disease within 2 years despite treatment. Interestingly, two groups at risk for HTLV infection, namely needle stick victims and recipients of HTLV-infected and/or pooled plasma products, showed no evidence for infection. Significantly increased HIV-1 prevalence was observed among paid blood donors, African Americans, homosexuals, female prostitutes, hemophiliacs, and other-than-low-grade NHL patients. Only one patient was infected with HIV-2. Of the nine HIV-positive, other-than-low-grade NHL patients, seven HIV-1 positives had B-cell lymphomas, one HIV-1 positive had an HTLV-I-positive CD4+ T-cell lymphoma, and one infected with HIV-2 had a CD4+ T-cell lymphoma that was HTLV negative. The data indicate that HTLV-I lymphoma, while uncommon, is not necessarily rare among other-than-low-grade NHL cases in the United States and, given its poor prognosis, should probably be studied separately in clinical trials.

Long-term follow-up of remission duration, mortality, and second malignancies in hairy cell leukemia patients treated with pentostatin

The nucleoside analogue, pentostatin, has demonstrated high complete response rates and long relapse-free survival times in patients with hairy cell leukemia, a disease that historically had been unresponsive to treatment. Long-term data on duration of overall survival and relapse-free survival and incidence of subsequent malignancies with this agent are lacking. Patients completing the treatment phase of a randomized, intergroup study who received pentostatin as an initial treatment or who crossed over after failure of interferon alpha were followed for survival, relapse, and diagnosis of subsequent malignancies. Two hundred forty-one patients treated with pentostatin as initial therapy (n = 154) or who crossed over after failure of interferon alpha (n = 87) were followed for a median duration of 9.3 years. Estimated 5- and 10-year survival rates (95% confidence interval) for all patients combined were 90% (87%-94%) and 81% (75%-86%), respectively. In the 173 patients with a confirmed complete response to pentostatin treatment, 5- and 10-year relapse-free survival rates were 85% (80%-91%) and 67% (58%-76%), respectively. Survival curves for patients initially treated with pentostatin and those crossed over were similar. Only 2 of 40 deaths were attributed to hairy cell leukemia. The mortality rate and incidence of subsequent malignancies were not higher than expected in the general population. Pentostatin is a highly effective regimen for hairy cell leukemia that produces durable complete responses. Subsequent malignancies do not appear to be increased with pentostatin treatment.

Novel therapies for chronic lymphocytic leukemia in the 21st century

Chronic lymphocytic leukemia (CLL) is one of the most common types of leukemia diagnosed in the Western Hemisphere. Introduction of the purine analogs has improved outcome for patients with CLL as measured by improvements in disease-free survival and has made it possible to attain a complete remission in a minority of patients with this disease. The therapeutic success with the purine analogs in CLL has led to preclinical and early clinical investigation of a variety of other therapeutic agents. This, combined with advances in the understanding the genetic and immunobiology of CLL, leaves hope that CLL may become a curable disease in this century.

Effect of antioxidants on pyrogallol-induced delay in gastric emptying in rats

The effect of a free radical generator pyrogallol on gastric emptying was studied in rats. Pyrogallol at doses of 25, 50, 100 and 150 mg/kg (i.p.) produced dose-dependent inhibition of gastric emptying. Pretreatment with vitamin C (100 and 500 mg/kg, p.o.), and vitamin E (100 and 500 mg/kg, p.o.) significantly reversed the inhibition in gastric emptying caused by pyrogallol 100 mg/kg. However, the combination of vitamin C and vitamin E (100 mg/kg) produced synergistic effect. Glutathione (100 mg/kg i.v.) 5-min pretreatment also reversed the inhibition of gastric emptying caused by pyrogallol 100 mg/kg. Ondansetron (3 mg/kg, p.o.) significantly reversed the pyrogallol effect. The effect of pyrogallol on malondialdehyde (MDA) levels and 5-HT levels in the stomach tissue was also studied. Pyrogallol at a dose of 100 mg/kg, i.p., significantly increased MDA levels and 5-HT levels in the stomach. Pretreatment with a combination of vitamin C and vitamin E (100 mg/kg, p.o.) and glutathione (100 mg/kg, i.v.) significantly ameliorated the rise in stomach tissue MDA caused by pyrogallol but had no significant effect on the rise in 5-HT levels caused by pyrogallol. The effect of different doses of 5-HT on gastric emptying was also studied. 5-HT had a differential effect on gastric emptying. The low and high doses (0.1, 0.3 and 30 mg/kg, i.p.) significantly inhibited the gastric emptying while doses ranging from 1 to 10 mg/kg, i.p., had no significant effect on the gastric emptying. The pretreatment with antioxidants, combination of vitamin C and vitamin E (100 mg/kg each, p.o.) and glutathione (100 mg/kg, i. v.) had no effect on the 5-HT (0.3 mg/kg, i.p.)-induced delay in gastric emptying. The result indicate the role of free radicals gastric emptying, and antioxidants may be of potential therapeutic value in disease conditions where free radicals are known to be released and the gastrointestinal effects are observed as symptoms or side effects of drug therapy.

Cytotoxicity of 2-chlorodeoxadenosine (cladribine, 2-cdA) in combination with other chemotherapy drugs against two lymphoma cell lines

Cladribine is a purine analog with impressive activity in patients with low-grade lymphoproliferative disorders. We studied the combination of cladribine with other antineoplastic drugs against two human-derived B-cell lymphoma cell lines in vitro. Cladribine was combined with cisplatin, daunorubicin, chlorambucil, paclitaxel or etoposide. Under the experimental conditions studied, only the combination of cladribine and cisplatin showed significantly increased cytotoxicity compared to the effect of either drug alone.

Chronic lymphocytic leukemia B cells express restricted sets of mutated and unmutated antigen receptors

To better understand the stage(s) of differentiation reached by B-type chronic lymphocytic leukemia (B-CLL) cells and to gain insight into the potential role of antigenic stimulation in the development and diversification of these cells, we analyzed the rearranged VH genes expressed by 83 B-CLL cells (64 IgM+ and 19 non-IgM+). Our results confirm and extend the observations of a bias in the use of certain VH, D, and JH genes among B-CLL cells. In addition, they indicate that the VH genes of approximately 50% of the IgM+ B-CLL cells and approximately 75% of the non-IgM+ B-CLL cells can exhibit somatic mutations. The presence of mutation varies according to the VH family expressed by the B-CLL cell (VH3 expressers displaying more mutation than VH1 and VH4 expressers). In addition, the extent of mutation can be sizeable with approximately 32% of the IgM+ cases and approximately 68% of the non-IgM+ cases differing by > 5% from the most similar germline gene. Approximately 20% of the mutated VH genes display replacement mutations in a pattern consistent with antigen selection. However, CDR3 characteristics (D and JH gene use and association and HCDR3 length, composition, and charge) suggest that selection for distinct B cell receptors (BCR) occurs in many more B-CLL cells. Based on these data, we suggest three prototypic BCR, representing the VH genes most frequently encountered in our study. These data suggest that many B-CLL cells have been previously stimulated, placing them in the "experienced" or "memory" CD5(+) B cell subset.

Expression of apoptosis-regulating proteins in chronic lymphocytic leukemia: correlations with In vitro and In vivo chemoresponses

B-cell chronic lymphocytic leukemia (B-CLL) represents a neoplastic disorder caused primarily by defective programmed cell death (PCD), as opposed to increased cell proliferation. Defects in the PCD pathway also contribute to chemoresistance. The expression of several apoptosis-regulating proteins, including the Bcl-2 family proteins Bcl-2, Bcl-XL, Mcl-1, Bax, Bak, and BAD; the Bcl-2-binding protein BAG-1; and the cell death protease Caspase-3 (CPP32), was evaluated by immunoblotting using 58 peripheral blood B-CLL specimens from previously untreated patients. Expression of Bcl-2, Mcl-1, BAG-1, Bax, Bak, and Caspase-3 was commonly found in circulating B-CLL cells, whereas the Bcl-XL and BAD proteins were not present. Higher levels of the anti-apoptotic protein Mcl-1 were strongly correlated with failure to achieve complete remission (CR) after single-agent therapy (fludarabine or chlorambucil) (P = .001), but the presence of only seven CRs among the 42 patients for whom follow-up data were available necessitates cautious interpretation of these observations. Higher levels of the anti-apoptotic protein BAG-1 were also marginally associated with failure to achieve CR (P = .04). Apoptosis-regulating proteins were not associated with patient age, sex, Rai stage, platelet count, hemoglobin (Hb) concentration, or lymph node involvement, although higher levels of Bcl-2 and a high Bcl-2:Bax ratio were correlated with high numbers (>10(5)/microL) of white blood cells (WBC) (P = .01; .007) and higher levels of Bak were weakly associated with loss of allelic heterozygosity at 13q14 (P = .04). On the basis of measurements of apoptosis induction by fludarabine using cultured B-CLL specimens, in vitro chemosensitivity data failed to correlate with in vivo clinical response rates (n = 42) and expression of the various apoptosis-regulating proteins. Although larger prospective studies are required before firm conclusions can be reached, these studies show the expression in B-CLLs of multiple apoptosis-regulating proteins and suggest that the relative levels of some of these, such as Mcl-1, may provide information about in vivo responses to chemotherapy. In vitro chemosensitivity data, however, do not appear to be particularly useful in predicting responses in B-CLL.

Examples of in vivo isotype class switching in IgM+ chronic lymphocytic leukemia B cells

Chronic lymphocytic leukemia (CLL) usually involves the expansion of a clone of CD5+ B cells synthesizing IgM antibodies. These B cells appear to be blocked at the antigen receptor-expressing stage of B cell differentiation and are thought not to undergo an isotype class switch to IgG or IgA production. In vivo and in vitro studies suggest, however, that in some instances terminal differentiation and isotype switching can occur. To test the hypothesis that in vivo isotype class switching occurs in IgM+ B-type CLL cells, we analyzed the PBMC of 19 CLL patients for the presence of transcripts encoding the rearranged CLL V(H)DJ(H) associated with either gamma or alpha H chains. The molecular data indicate that approximately 50% of B-CLL patients have amplifications of IgM+ B cells that undergo an isotype class switch. Switching to IgA appears to occur more often than to IgG; also, switching can involve different IgG subclasses in individual patients. In many instances, these CLL-related gamma and alpha transcripts are much more plentiful than those of normal B cells that produce the same isotype. These switched transcripts do not reveal evidence for the accumulation of significant numbers of new V(H) gene mutations. The cellular data indicate that B cells with lesser amounts of surface membrane IgD and higher IgM/IgD ratios are more likely to undergo this switching process. Furthermore, B cells expressing IgG and IgA of the same idiotype or V(H) family and the same CDR3 length as those of the CLL IgM+ clone can be identified in the blood of patients studied using multiparameter immunofluorescence analyses. Collectively, these data suggest that not all members of a B-CLL clone are frozen at the surface membrane Ig-expressing stage of B cell maturation, and that some members can switch to the production of non-IgM isotypes. The occurrence of switching without the accumulation of V gene mutations indicates that the processes of differentiation and diversification are not linked.

Differentiating agents do not induce a true hairy cell phenotype in B-CLL cells in vitro

B-Chronic lymphocytic leukemia (B-CLL) and hairy cell leukemia (HCL) are both differentiated B-cell lymphoproliferative disorders. Prior studies have suggested that phorbol esters and the macrocyclic lactone Bryostatin-1, which are both protein kinase-C activators, can induce the differentiation of B-CLL cells into HCL cells in vitro, as evidenced by morphology, phenotype and TRAP activity. The differentiating effect of all-trans retinoic acid on B-CLL cells has been less extensively studied. We studied the effects of incubating adherence purified B-CLL cells with phorbol myristic acetate (PMA), all-trans retinoic acid (ATRA), and Bryostatin-1. None of these agents induced a true HCL phenotype (CD5-, CD11c/CD25 coexpression) under the conditions studied.

Clinical and morphological features of cases of trisomy 13 in acute non-lymphocytic leukemia

Trisomy 13 has been infrequently reported as a primary non-random karyotypic change in myeloid leukemias. To elucidate its clinical significance we examined the clinical and hematological data in nine ANLL patients in whom we found this change, in a series of 175 cytogenetically abnormal ANLL patients. Morphologically, six of the patients were FAB-M1, two were FAB-M4 and one was FAB-M5. Bone marrow aspirates contained more than 90% blasts in eight of the patients. By immunophenotype, TdT was present in four of the patients, CD34 was present in four of five patients tested and CD5 was present in one of five patients tested. Blast cells in all patients expressed two or more myeloid surface antigens. These data suggest the proliferation of an immature myeloid cell in these patients. Complete remission was achieved in seven patients; however, remissions were short-lived. Eight patients expired between 1 and 13 months from diagnosis (median survival 5 months). Combining our findings with data in the published literature on trisomy 13 in ANLL, a larger data set consisting of 29 patients was established to determine better the clinical significance of this cytogenetic entity in ANLL. We found that this cytogenetic change has been reported in all subsets of FAB classification excepting M6 and M7. Median age at presentation was 60 years and no association with gender was noted. Median WBC was 29.5 x 10(9)/l, the majority of patients were thrombocytopenic (median platelet count 86 x 10(9)/l) and median survival was 5.2 months. This study associates trisomy 13 with malignant transformation of myeloid progenitor cells. These patients respond well to induction therapy, but relapse occurs quickly and the survival duration is poor.

Mutator phenotype in a subset of chronic lymphocytic leukemia

The replication error phenotype (RER+), characterized by widespread microsatellite instability, is an important feature of tumors from patients with hereditary nonpolyposis colorectal carcinoma (HNPCC). This widespread instability affects repeat tracts of all lengths and is usually attributed to mutations of critical mismatch repair genes. Recently, several reports described occasional microsatellite alterations in tumors not associated with HNPCC. However, a true mutator phenotype (RER+) is very rare outside of HNPCC-associated malignancies. We examined 29 cases of chronic lymphocytic leukemia (CLL), the most common leukemia in the Western world for evidence of microsatellite instability. We identified a mutator phenotype in (2/29) 7% of the cases studied. These data suggest that the mismatch repair pathway may be altered in at least a subset of patients with CLL.

Salivary gland hypofunction in elderly patients attending a xerostomia clinic

OBJECTIVES

To investigate the aetiological factors and the prevalence of salivary gland hypofunction (SGH) in patients complaining of xerostomia.

DESIGN

Prospective, clinical study.

SETTING

Xerostomia clinic in the Department of Oral Medicine at Liverpool University Dental Hospital.

SUBJECTS

100 consecutive patients, aged 60 years or older, referred for investigation of xerostomia.

INTERVENTIONS

Patients were asked specific questions concerning their complaint of oral dryness and associated orofacial symptoms. A detailed medical history was recorded and patients underwent a systematic examination of the head, neck and oral structures. All patients underwent haematological, biochemical, immunological investigations, urinalysis and sialometry. Further investigations and referrals to other specialists were undertaken when appropriate.

MAIN OUTCOME MEASURES

The causes of xerostomia were established on the basis of clinical and laboratory findings and SGH was defined as an unstimulated whole salivary flow rate of < 0.2ml/min,

RESULTS

The causes of xerostomia were identified as: Sjögren's Syndrome (40), iatrogenic (22), psychogenic (14), idiopathic (19), diabetes (1), candidosis (3) and alcohol (1). Sixty five percent of the patients studied had SGH.

CONCLUSIONS

This study has shown that 65% of patients whose presenting complaint was xerostomia had objective evidence of SGH. Several aetiological factors were identified, the most common of which was Sjögren's Syndrome. The possibility of associated systemic diseases should be considered when establishing the aetiology of SGH.

Rapid HCV RNA detection by PCR followed by a new non-radioactive liquid hybridisation assay and comparison with RIBA

A one-stage polymerase chain reaction (PCR) followed by an automated liquid hybridisation assay was used to examine anti-HCV-positive patients. The presence of HCV-RNA in 251 randomly selected enzyme immunoassay (EIA) positive clinical specimens was compared to their RIBA pattern. An association of a RIBA pattern with presence or absence of HCV-RNA was not detected. One hundred of these samples were also evaluated after dividing them into normal and elevated serum alanin aminotransferase (ALT) levels. PCR results were obtained on the basis of amplification products from two different gene regions (5'-NC region and NS 3). To prove the specificity of the PCR products, a commercially available digoxigenin-based liquid hybridisation assay was evaluated. The sensitivity was comparable to the results obtained after nested PCR. Based on the results of the study, the two-stage PCR can be changed in favour of the easier one-step PCR which offers the advantage of fewer contamination problems.

Leukemic meningitis in B-cell prolymphocytic leukemia. A clinical, pathologic, and ultrastructural case study and a review of the literature

BACKGROUND

Leukemic meningitis is rare in B-chronic lymphocytic leukemia (CLL) and B-prolymphocytic leukemia (PLL); a MEDLINE search for reports published 1960 and after disclosed only nine prior reports. A patient with stable Rai Stage II CLL/PL developed mental status changes. Lumbar puncture revealed a lymphocytic pleocytosis with prolymphocytes containing intracytoplasmic inclusions.

METHODS

The patient's cerebrospinal fluid lymphocyte population was analyzed by immunophenotyping and electron microscopy.

RESULTS

The studies revealed a clonal population of B prolymphocytes, with typical immunophenotypic and ultrastructural characteristics. The patient was treated with intrathecal chemotherapy with eventual resolution of the cerebrospinal fluid pleocytosis and return to his normal neurologic status. Prior studies also have revealed the efficacy of intrathecal chemotherapy.

CONCLUSION

Leukemic meningitis in CLL or PLL is responsive to treatment with intrathecal chemotherapy.

Recent progress in chronic lymphocytic leukemia. International Workshop on chronic Lymphocytic Leukemia

The data we discuss indicate substantial recent progress in understanding and treating CLL. However, despite considerable new information, many of the intriguing issues we posed at previous IWCLL meetings remain unanswered. Prominent among these are the questions of what causes CLL, what is the relation between CLL and normal B-cell development, are T-cell abnormalities a cause of consequence of CLL, why are auto-immune features so prominent and how is CLL best treated? Although these gaps in our knowledge are unfortunate, they give us the opportunity for yet another IWCLL meeting: 1996 in Greece. More to follow.

2-Chlorodeoxyadenosine is an active salvage therapy in advanced indolent non-Hodgkin's lymphoma

PURPOSE

To determine the response rate to 2-chlorodeoxyadenosine (2-CdA; cladribine) in patients with advanced indolent non-Hodgkin's lymphoma (NHL) who fail to respond to or progress after a response to standard chemotherapy drugs.

PATIENTS AND METHODS

Twenty-one patients were treated with at least one cycle of 2-CdA 0.1 mg/kg/d by continuous infusion for 5 or 7 days.

RESULTS

The overall response rate (complete response [CR] and partial response [PR]) was nine of 21 patients (43%; 95% confidence interval, 22% to 64%). Unmaintained durable responses (longest follow-up, 29+ months) have been observed. The treatment was well tolerated by all patients. The major toxicity was related to myelosuppression (predominantly neutropenia) and immunosuppression with infection.

CONCLUSION

The purine analog 2-CdA is an active salvage therapy in pretreated patients with indolent NHL, and deserves further assessment in untreated patients and in combination with other chemotherapy agents.

Prolonged subcutaneous administration of recombinant alpha 2b interferon in patients with previously untreated Philadelphia chromosome-positive chronic-phase chronic myelogenous leukemia: effect on remission duration and survival: Cancer and Leukemia Group B study 8583

We investigated whether recombinant alpha 2b interferon (r alpha 2bIFN) would reduce the proportion of bone marrow Philadelphia chromosome (Ph) cells in chronic-phase chronic myelogenous leukemia (CML) by treating 107 previously untreated patients daily with r alpha 2bIFN at 5 x 10(6)IU/m2 subcutaneously. Patients with complete remission, partial remission, or partial hematologic remission received treatment until progression; those with progressive disease were taken off study and observed for survival. Sixty-three (59%) of the patients achieved at least a partial hematologic remission (24 complete remissions and 39 partial remissions). The median time to response for the 63 responders was 3.4 months, with a median duration of remission of 52 months and with 81% of responders continuing in remission beyond 12 months. The median survival for the 107 patients was 66 months. Of 78 patients with cytogenetic follow-up data, 31 (40%) achieved a partial cytogenetic response (n = 17) or a complete cytogenetic response (n = 14). The percentage of cytogenetic responders among all patients was 29% (31 of 107 patients). The median time to first cytogenetic response was 9 months. A major dose reduction of r alpha 2bIFN (> or = 50%) was required at some time during treatment in 38% of patients, 26% required 10% to 49% dose reductions, and 36% had minor dose reductions of < or = 10%. No association was observed between dose received and the attainment of a cytogenetic response. None of the usual prognostic factors (sex, race, performance status, weight loss, time from diagnosis to treatment, hepatosplenomegaly, age, symptoms, hemoglobin, or platelet, blast, basophil, or white blood cell count) were significantly related to survival. These data provide confirmation that major cytogenetic responses to prolonged administration of subcutaneous r alpha 2bIFN occur in 20% to 38% (95% confidence interval) of chronic-phase Ph-positive patients. Although it is hypothesized that patients achieving major cytogenetic responses to r alpha 2bIFN should have prolonged remission duration and survival compared with nonresponders, analyses of the effect of cytogenetic responders by both "landmark" and time-dependent covariate techniques fail to provide statistically significant evidence for an effect of cytogenetic response on remission duration or survival. This may be due in part to an effect size insufficiently large to be detected with the number of patients treated in this study. Thus, confirmation of remission duration or survival benefit, if any, of r alpha 2bIFN therapy in Ph-positive chronic-phase CML must await the outcome of randomized trials comparing IFN with conventional agents.

The frequency of long-term remission in patients with acute myelogenous leukaemia treated with conventional maintenance chemotherapy: a study of 760 patients with a minimal follow-up time of 6 years

Remission duration associated with the administration of conventional maintenance chemotherapy to patients with acute myelogenous leukaemia was evaluated. The records of 760 patients who entered remission between 1974 and 1979 were reviewed. The median duration of remission was 1.1 years with 16% of patients remaining in remission at 8 years. The relapse curve was biphasic with a high rate of relapse during the first 2 1/2 years of remission followed by a much lower relapse rate thereafter. Leukaemic relapses were noted through 8 years of remission. A plateau phase indicating freedom from the risk of leukaemic recurrence is not clearly apparent yet but may exist after the eighth year of remission.