Aspirin enhances the benefits of late reperfusion on infarct shape. A possible mechanism of the beneficial effects of aspirin on survival after acute myocardial infarction

BACKGROUND

The time window of the benefits of late reperfusion on infarct shape is limited. In rats, these benefits diminish in a wave front over time, with minimal benefits when reperfusion follows 16 hours of coronary occlusion. The mechanism of the benefits of aspirin on survival after acute myocardial infarction is unknown. The purpose of this study was to test the ability of aspirin to enhance the benefits of late coronary artery reperfusion on infarct shape and to examine the mechanism of the benefits of aspirin on infarct shape.

METHODS AND RESULTS

Rats were entered into two different protocols, the morphometric and the histological protocols. In the morphometric protocol, rats were randomized into two groups: the aspirin group, in which rats underwent left coronary artery occlusion followed by treatment with aspirin (12 mg/kg i.v.), and the control group, in which rats underwent left coronary artery occlusion followed by treatment with placebo. Rats in both groups were reperfused 8 hours after coronary occlusion. Rats in the aspirin group received aspirin in the drinking water (12 +/- 2 mg/kg daily). Morphometric analysis was performed 2 weeks after acute myocardial infarction. In the histological protocol, rats underwent the same randomization, coronary occlusion, and reperfusion protocols. Hearts were removed 24 hours after coronary occlusion, and microvessels were assessed for patency. Infarct size expressed as a percent of circumference was similar in the aspirin and placebo treatment groups (28 +/- 2% versus 33 +/- 3%, P = NS). Septal thickness was also similar in both groups (1.8 +/- 0.1 versus 2.1 +/- 0.1 mm, P = NS for aspirin versus placebo). The aspirin-treated group had thicker infarcts compared with the placebo-treated group (0.8 +/- 0.1 versus 0.5 +/- 0.1 mm, P < .05) and less expanded infarcts (expansion index, 1.2 +/- 0.1 versus 2.0 +/- 0.2, P < .05). Aspirin was associated with increased patency of the microvessels in the infarcted area compared with the placebo group (96% versus 64% of microvessels patent, P < .001).

CONCLUSIONS

Aspirin enhances the benefit of late coronary artery reperfusion on infarct shape after 8 hours of coronary occlusion. The benefits of aspirin on infarct shape after late reperfusion are related to increased patency of the microvessels in the infarcted area.

Spontaneous infarction of parathyroid adenoma: case report and literature review

A patient with asymptomatic primary hyperparathyroidism who spontaneously became normocalcemia is reported. The only significant finding was that of pain and tenderness in the enlarged parathyroid gland 2 weeks prior to surgery. This was due to a recent infarction of a parathyroid adenoma.

Hodgkin disease in patients 60 years of age or older. Histologic and clinical features of advanced-stage disease. The Cancer and Leukemia Group B

BACKGROUND

This article reviews the salient pathologic and clinical features of 171 patients with Stage III-IV disease who were 60 years of age or older who were treated on four Hodgkin disease (HD) protocols from 1969 to 1988.

METHODS

Pretherapy sections were reviewed centrally for correlation of the histologic classification with anatomic sites of involvement and survival.

RESULTS

The diagnosis of HD was confirmed in 114 (66.7%) patients. Non-Hodgkin lymphomas (NHL) and a miscellaneous non-HD group accounted for 52 (30.4%) and 5 (2.9%) of the cases. The overall median survival times of patients with Stage III-IV HD and NHL who were 60 years of age or older in the four protocols were not significantly different (1.5 versus 1.3 years, respectively; P = 0.28). There also was no significant correlation between the survival of these patients with HD and either the Rye classification, 19 specific histologic parameters, or the British National Lymphoma Investigation grading system for HDNS. In the last protocol, the 5-year survival rate of patients with HD who were 60 years of age or older was lower than that of patients 40-59 years of age or that of those younger than 40 years of age (31% versus 63% versus 79%, respectively, P < 0.0001). Patients with HD entered into the two most recent protocols showed lower incidences of involvement of cervical and iliac-inguinal-femoral lymph nodes and skin-subcutaneous tissues than the patients with NHL who were misdiagnosed as HD. Moreover, patients with Stage III-IV HD in the most recent protocol who were 60 years of age or older had lower rates of involvement of the cervical and mediastinal-hilar lymph nodes and a higher rate of involvement of the gastrointestinal tract than younger patients.

CONCLUSIONS

Patients with Stage III-IV HD and NHL who are 60 years of age or older differ with respect to the rates of involvement of specific anatomic sites but not in survival when treated with HD protocols. In contrast, patients of different age groups with Stage III-IV HD disease differ with regard to the rates of involvement of anatomic sites and survival.

Correlation of proliferative index (PCNA reactivity and Ki-67 reactivity) in primary breast carcinoma with hormone status, lymph node status, and disease-free survival

The proliferative activity in 42 cases of breast cancer were assessed immunohistochemically using antibodies to proliferating cell nuclear antigen (PCNA) and Ki-67. These indices were correlated with the steroid receptor status, pathologic stage, and disease-free survival. There was a strong direct correlation between the two proliferation indices (r = .902, P < 0.001, Kendall's rank correlation). There was a weak correlation between the hormone receptor status and proliferation indices that was not significant when statistically tested. The cases were stratified into PCNA low proliferative index (PI) group (< 4.5% positive cells) and PCNA high PI group (> 4.5% positive cells). In the low PI group, five of 18 (28%) patients were node-positive in contrast to eight of 14 (58%) patients in the high PI group. After a follow-up period of 42-60 months, 14 of 19 (74%) patients in the low PI group were disease-free compared to 10 of 17 (53%) patients in the high PI group. The PCNA and Ki-67 proliferative indices appear to be of great prognostic value and may help identify a subset of breast cancer patients who should be given adjuvant therapy.

Oral congenital cystic choristomas: a case report

Solitary choristomas containing gastrointestinal mucosa occur rarely in the tongue and the oral mucosa and usually present as an asymptomatic mass. This report documents the occurrence of two congenital intraoral cystic choristomas in a 5-month-old male infant. The cysts were located on the dorsum of the base of the tongue and left floor of mouth anterior to the lingual cyst. Both cysts were lined by nonkeratinizing squamous epithelium and gastric, intestinal, and respiratory epithelium. The cysts were excised by an oral approach.

Association of solubilized angiotensin II receptors with phospholipase C-alpha in murine neuroblastoma NIE-115 cells

The peptide angiotensin II (AngII) has been reported to stimulate phosphoinositide-specific phospholipase C (PLC) activity in the murine neuroblastoma cell line N1E-115. In the present study, polyclonal antibodies raised against a PLC isoenzyme, PLC-alpha, reacted with a 60-kDa protein present in both membrane and cytosolic fractions of differentiated N1E-115 cells. In order to examine the possible association of PLC-alpha with cell surface AngII receptors (AngII-Rs), membranes from differentiated N1E-115 cells were solubilized, using the zwitterionic detergent 3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonate (CHAPS). CHAPS (1%) solubilized AngII-Rs, from N1E-115 cells, that maintained their high affinity for agonists. Gel filtration analysis of the solubilized membranes revealed that the majority of the specific binding of 125I-AngII eluted as a large protein complex with a molecular mass of 380 kDa and that agonist binding was partially reduced by guanosine-5'-O-(3-thio)triphosphate (GTP gamma S), within this complex. CHAPS also effectively solubilized immunoreactive PLC-alpha, from N1E-115 cell membranes, that was similarly present within the 380-kDa AngII-binding complex. Anti-PLC-alpha antisera immunoprecipitated approximately 16% of the total phosphatidylinositol-4,5-bisphosphate-specific PLC activity in the 1% CHAPS extract and 40% of cytosolic PLC activity. Moreover, a 60-kDa 35S-Trans S-labeled protein, comigrating with immunoreactive PLC-alpha, was immunoprecipitated from the 1% CHAPS extract by the antisera. In addition, anti-PLC-alpha antisera immunoprecipitated approximately 20% of solubilized AngII-Rs prebound with 125I-AngII but failed to precipitate receptors prebound with the antagonist 125I-Sarc1,Ile8-AngII. The anti-PLC-alpha antisera also immunoprecipitated AngII-Rs when intact membranes were labeled with 125I-AngII before solubilization in 1% CHAPS, suggesting that the AngII-R interaction with PLC-alpha was not the result of detergent-promoted protein-protein interaction. On the other hand, monoclonal antibodies against another PLC isozyme, PLC-gamma, did not precipitate AngII-Rs in solubilized N1E-115 membranes. Finally, the formation of the immunoprecipitated AngII-R-PLC-alpha complex was disrupted by the nonhydrolyzable guanine nucleotide analog GTP gamma S, suggesting that the interaction between AngII-Rs and PLC-alpha is likely to involve a heterotrimeric guanine nucleotide-binding protein in neuron-like cells.

Prognostic significance of DNA measurement determined by image analysis in human breast carcinoma

The nuclear DNA of human breast carcinoma cells was studied by image analysis using archival paraffin-blocked tissues from two groups of patients with breast cancers. One group had survived greater than 10 years (N = 20) and the other less than 3 years (N = 26) after the initial diagnosis. Cellular preparations were made from pepsin-digested deparaffinated sections. The nuclear DNA was stained with Feulgen stain and measured by a computerized image analysis system. The data show that in addition to nodal status the pattern of DNA histograms obtained from image analysis can provide powerful prognostic information in breast carcinoma. The prognostic value of DNA histogram patterns may be independent of nodal status.

Thymic carcinoma arising from long standing thymoma and presenting with pituitary metastases

Primary thymic squamous cell carcinoma is uncommon and has only rarely been linked to a pre-existing thymoma. We are reporting a case of primary thymic squamous cell carcinoma with pituitary metastases, in a patient with a long standing thymoma.

Up-regulation of angiotensin II receptors by in vitro differentiation of murine N1E-115 neuroblastoma cells

In vitro differentiation of murine neuroblastoma N1E-115 cells induced by low serum (0.5%) and dimethyl sulfoxide (1.5%) increased the uptake of 45Ca2+ as well as basal and forskolin-stimulated adenylate cyclase activity. Associated with these biochemical indices of differentiation was an increase in the density of binding sites for the angiotensin II (Ang II) receptor agonist 125I-[Sar1]-Ang II and the antagonist 125I-[Sar1,Ile8]-Ang II (125I-SARILE). This up-regulation was apparent within 24 hr and was maximal at 72 hr. Other manipulations that independently increased intracellular cAMP or Ca2+ levels produced a qualitatively similar up-regulation of Ang II receptors. In vitro differentiation did not diminish the specificity of these receptors for Ang-II related peptides. Sarcosine-substituted Ang II receptor antagonists such as [Sar1,Gly8]-Ang II, [Sar1,Thr8]-Ang II, or SARILE itself competed for 125I-SARILE in a monophasic fashion, whereas the competition displayed by the agonists Ang II, angiotensin III, and Crinia-Ang II for 125I-SARILE-labeled sites was biphasic, consisting of distinct high and low affinity components. Moreover, in vitro differentiation predominantly increased the density of high affinity sites for angiotensin III and Crinia-Ang II, but the lower affinity site for Ang II, and in all three cases the majority of this increased binding was insensitive to guanine nucleotides. Collectively, these results demonstrate that the expression of Ang II receptors on neuron-like cells is regulated by the biochemical events accompanying differentiation and suggest that the biphasic nature of the binding of some angiotensin agonists may be indicative of multiple receptor subtypes.

Severe chronic EBV infection associated with specific EBV immunodeficiency and an EBNA+ T-cell lymphoma containing linear, EBV DNA

A patient with severe chronic Epstein-Barr virus (EBV) infection (CEBVI) of 6 years duration developed an EBV+ T-cell lymphoma. To determine whether the development of the T-cell tumor was linked to EBV, we studied this patient's EBV-specific immune response and her T-cell tumor tissue for evidence of EBV infection. Peripheral blood lymphocytes from this patient were systematically studied for immune function and response to EBV. Tumor tissue was examined for EBV genome and for evidence of EBV replication. This patient failed to develop anti-EBV nuclear antigen (EBNA) antibodies and had decreased mitogen responsiveness. Her T-cells showed a broad suppression of both autologous and allogeneic B-cells, which was coincident with clinical hypoimmunoglobulinemia. A selective cytotoxic T-cell defect toward autologous EBV-infected B lymphoblasts, which could not be corrected by the addition of lymphokine-mediated T-cell help, was also documented. A lymph node biopsy taken 5 years after her clinical presentation revealed lymph node architecture completely effaced by a diffuse CD3+, CD4+, Ia+, CR2+ T-cell lymphoma containing EBNA and linear, replicating EBV DNA. Select CEBVI patients with humoral and combined cellular aberrations in the immune response to EBV may be predisposed to the development of EBV+ T-cell tumors.