Biomedical subjects

R Bhatti

Publications and source records attributed to R Bhatti.

10 recordsLinked to original sources

PubMed1991

Immunomodulatory effect of cyclophosphamide on host humoral immunity in Dunning's R-3327 adenocarcinoma of the prostate.

The object of the present investigations was delineation of the exclusive effects of cyclophosphamide (Cytoxan) on host humoral response to tumor, as evaluated by the level of circulating antigen/antibody complexes (AACs), which may reflect the chemo-responsiveness of hosts and provide a rationale for new therapeutic strategies. Our data, recorded in Copenhagen X Fischer rats bearing Dunning's R-3327 Mat Ly-Lu adenocarcinoma of the prostate, show no modulatory effect of cyclophosphamide at 10 mg/kg, a nonspecific immunosuppressive effect at 30 mg/kg, and a definite immunostimulatory effect on host humoral immunity at 100 mg/kg. Sequential determination of AAC levels at different stages of tumor growth, i.e. from the primary to the metastatic stage, performed with the original purpose of demonstrating that any disturbance in the immunoregulatory mechanism of the host was due to cyclophosphamide rather than to changes in tumor load, revealed that levels of AACs parallel disease progression in the initial stages of primary tumor growth but rapidly decrease to near-normal levels in the presence of heavy tumor burden.

Adenocarcinoma↗

PubMed1990

Suppression of canine antral gastrin secretion by urine.

Distention of the gastric antrum with an alkaline fluid normally results in the secretion of gastrin. Following gastrocystoplasty in humans, however, hypergastrinemia has not been observed. We explored the possibility that a component of urine may suppress antral gastrin activity in the dog. Partial cystectomy and antral transposition to the bladder (ATB) was performed in five animals and antral transposition to the colon (ATC) was performed in five other dogs to serve as a hypergastrinemic controls. At four and eight weeks after surgery the mean serum gastrin levels in the ATC dogs were significantly greater than the mean preoperative levels (p less than 0.05). In contrast, at four and eight weeks after surgery the mean serum gastrin levels in the ATB animals were significantly less than the mean preoperative levels (p less than 0.05). The antral G-cell density as determined by immunohistochemical study at eight weeks after surgery was greater than normal in the ATC dogs but less than normal in the ATB dogs; but the differences did not achieve statistical significance. In another series of experiments using four other dogs a 4% aqueous peptone solution and a 4% peptone solution in concentrated dog urine were instilled into exteriorized antral pouches. The mean serum gastrin levels at 60 and 90 minutes after instillation of the former were significantly increased (p less than 0.05), but there was little or no change after instillation of the latter. Urine, or a component of urine, appears to suppress canine antral gastrin secretion and may explain the absence of hypergastrinemia following gastrocystoplasty in humans.

Animals↗

PubMed1988

Role of transurethral resection of the prostate in hematogenously disseminated metastasis.

Dissemination of tumor cells by vascular channels seems to be enhanced by certain surgical procedures, e.g. transurethral resection of the prostate, an operative procedure commonly used in the diagnosis and management of prostatic cancer, the third biggest killer of men in the United States. Circulating tumor cells have been the subject of great controversy as they are considered to be the connecting link between the primary tumor and the hematogenously disseminated metastatic growths. Isolation and identification of tumor cells which get released into the vascular channels is somewhat complicated. We report our experience with a technique for isolating and identifying prostatic tumor cells in the circulation and briefly discuss the role of transurethral resection of the prostate in the management of prostatic cancer.

Humans↗

PubMed1987

Inhibition of sensitized leukocyte's in vitro reactivity by circulating immune complexes in prostate cancer.

Circulating immune complexes in the sera of patients with confirmed histological diagnosis of carcinoma of the prostate, were found to interfere in the sensitized leukocyte's in vitro reactivity to prostate cancer associated antigen as evaluated by tube leukocyte adherence inhibition assay, thereby suggesting an inhibitory role of such serum factors in host's anti tumor cell mediated immune responses.

Adenocarcinoma↗

PubMed1987

An evaluation of prostate specific antigen in prostatic cancer.

Prostate specific antigen levels were measured in 118 patients with prostatic cancer and 138 control individuals. Prostate specific antigen was sensitive in detecting prostatic cancer. The levels of prostate specific antigen were elevated in 10 per cent of the patients with stage A, 24 per cent with stage B, 53 per cent with stage C and 92 per cent with stage D disease. However, prostate specific antigen levels also were elevated in 9 per cent of the patients with benign prostatic hypertrophy. This lack of specificity in the presence of benign prostatic hypertrophy probably precludes prostate specific antigen from being recommended as a screening test for prostatic cancer. The ultimate role of prostate specific antigen might be as the marker of choice to monitor therapy for prostatic carcinoma.

Antigens↗

PubMed1987

An evaluation of five tests to diagnose prostate cancer.

In an effort to determine which of five tests was the most efficient in the diagnosis of prostate cancer, 280 male patients were screened employing aspiration cytology, transrectal ultrasound, acid phosphatase, prostate specific antigen, and the digital rectal examination. The digital rectal examination was the most efficient (75%) and in order of decreasing accuracy were prostate specific antigen (74%), prostatic ultrasound (71%), acid phosphatase (66%), and finally aspiration cytology (63%). In an era when what are more expensive and more technology are assumed to be better, what is simple and traditional is ignored. From an evaluation of these patients it appears that the digital rectal examination still retains its diagnostic efficiency. Finally, in this age of escalating medical costs and physician accountability for these expenses, you can't beat the cost - benefit ratio for the old fashioned rectal exam.

Acid Phosphatase↗

PubMed1986

Leukocytic subset distributions of spleen cells obtained from rats bearing variants of the Dunning prostatic adenocarcinoma.

Employing monoclonal antibodies, the relative frequencies of mononuclear cell types found in spleen cell populations were compared between rats bearing variants of the Dunning prostate adenocarcinoma and a series of non-tumor bearing control animals. The identification and quantitation of such subsets greatly expands our knowledge of immune status and function. The results indicate that the spleen cell populations from animals bearing either the Dunning R3327-H, G or MAT-LyLu sublines have significant decreases in their helper T cell/suppressor T cell ratios when comparisons are made to cells obtained from non-tumor bearing animals. In addition decreases in total T cell content and increases in splenic monocytes were noted. It appears that most of these deviations are the result of general Dunning tumor presence, rather than due to any particular subline characteristic. These changes may be analogous to similar alterations reported in the peripheral blood of humans bearing Stage D prostatic cancer, suggesting that the Dunning tumor may provide an appropriate model for evaluating interactions between the immune response, the tumor and therapy.

Adenocarcinoma↗

PubMed1980

The immune response to prostate cancer: an evaluation and a review.

The effects of stage and therapy of prostate cancer on the immune response were evaluated in 193 patients with an histologic diagnosis of prostatic malignancy. There was little or no effect, as measured by these generally non-specific tests, on the immune response. The host-tumor immune interaction is difficult to evaluate in prostate cancer. The complexities of measuring prostate tumor immunity are discussed and the literature is reviewed.

Adenocarcinoma↗

PubMed1978

Cellular immunity in bladder cancer patients.

The leukocyte adherence inhibition test was used to evaluate the cellular immune status of 16 patients with a histological diagnosis of transitional cell carcinoma of the bladder. The reactivity of the leukocytes was measured against extracts of transitional cell carcinoma as well as renal cell carcinoma. The leukocytes of age and sex-matched control subjects, as well as patients with urinary tract infection, also were studied. The leukocytes of patients with transitional cell carcinoma were more reactive to extracts of transitional cell carcinoma. These results suggest that a response to tumor-associated antigens is present in transitional cell carcinoma patients.

Adenocarcinoma↗

PubMedDate not supplied

Transient post-partum thyroid dysfunction and postnatal depression.

In the course of a population study of thyroid dysfunction in pregnancy and the post-partum period, 65 women, considered to be antibody-positive (microsomal and thyroglobulin), and 82 antibody-negative women were assessed for postnatal depression at 6-8 weeks post partum. The women were also assessed for the development of post-partum thyroid dysfunction. Of the 147 women, 22 met DSM-III criteria for major depression. The presence of autoantibodies showed little association with depressed mood but there was a minor association of postnatal depression with actual thyroid dysfunction in that incidence of the latter condition was higher in depressed women (Raskin scale P less than 0.01; Edinburgh scale P less than 0.05; Montgomery-Asberg scale P less than 0.1). Three of eight mothers with thyroid dysfunction had major depression and were depressed on all three scales.

Adult↗