D Driák

Charles University in Prague, Praha, Hlavni mesto Praha, Czech Republic

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Publications (32)20.68 Total impact

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    ABSTRACT: Reliable staging system should facilitate prognosis assessment, decision on treatments, and evaluation of their outcomes. A good staging system must meet three basic characteristics: validity, reliability, and practicality. The purpose of such system is to offer classification of the extent and progress of gynaecological cancer that will allow the comparison of different treatment methods and the choice of optimal treatment for individual patients. The previously developed staging of gynaecological cancers has become outdated because it has not considered results of current medical research that allow refinement of prognostic subgroupings. Changes based on new findings were proposed for staging of uterine malignancies by the FIGO (The International Federation of Gynecology and Obstetrics) Committee on Gynecologic Oncology and approved by the FIGO Executive Board in 2008, and were published in 2009. Stage 0 was deleted, since it did not represent any stage of invasive tumor. Four fundamental changes were made in the staging system of endometrium carcinoma. The revised staging system for endometrium carcinoma divides patients to groups with similar prognosis; carcinosarcoma is staged identically. The novel system will facilitate exchange of relevant information between diverse oncological centers and thereby promote knowledge dissemination and stimulate research around the globe. A different staging system was proposed for adenosarcomas, leiomyosarcomas and endometrial stromal sarcomas. It is based on features used for the sarcomas of other soft tissues. The purpose of the text is to review current knowledge in this area. Keywords: staging - endometroid carcinoma - uterine sarcoma - FIGO - TNM.
    Ceskoslovenska patologie 04/2014; 50(2):100-5.
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    ABSTRACT: The most common malignancies of the female genital tract are endometrial carcinomas, whose are generally proceeded by hyperplasia. The maintenance of tissue homeostasis is to great extent governed by apoptosis, whose defects can lead to the preneoplastic and/or cancerous changes. Endometrial apoptosis involves among others three groups of proteins of the Bcl-2 family. First group contains anti-apoptotic proteins (e. g. Bcl-2, Bcl-xL). The other two groups belong to the pro-apoptotic proteins with three (e. g. Bax, Bak) or one (e. g. Bad, Bid) so-called BH domains. Bad and Bid trigger the oligomerization of Bak and Bax protein, which permeabilize the outer mitochondrial wall. Unlike Bid, Bad cannot directly trigger apoptosis. Instead, Bad lowers the threshold at which apoptosis is induced, by binding anti-apoptotic Bcl-2 proteins. However, their mutual counterbalance or synergism in the human endometrium has not been reported yet.In this study, the levels of Bid and Bad were measured using SDS-PAGE and Western blotting with specific antibodies, with the aim to analyse expression of Bid and Bad proteins in normal (NE), hyperplastic (HE) and cancerous (CE) endometrium. We demonstrated that Bid expression in CE reached only 47% and 50% of this observed in NE and HE. Conversely, Bad expression in HE reached only 40% and 36% of this observed in NE and CE, respectively. We detected no significant changes of Bid expression between HE and NE, and levels of Bad protein were not different between CE and NE.Trend of Bid and Bad protein expression is clearly opposite in HE and CE. We hypothesise that disrupted apoptotic program in CE seems to be reduced further by lowering levels of direct apoptotic trigger protein Bid. We suggest that the adenocarcinoma tissue of human endometrium thus tries to strengthen its apoptotic effort by lowering the apoptotic threshold via higher Bad levels. Keywords: Bad, Bid, cancerogenesis, human endometrium.
    Neoplasma 03/2014; · 1.57 Impact Factor
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    ABSTRACT: Objective: To summarize new data which can help in decision on tailoring treatment of cervical precancerosis.Design: Review article.Setting: Department of Gynaecology and Obstetrics, First Faculty of Medicine, Charles University and Hospital Na Bulovce in Prague; Oncogynaecological Center, First Faculty of Medicine, Charles University and General University Hospital in Prague.Results: Precancerous lesions of the cervix are represented by squamous cervical intraepithelial neoplasias (CIN) and glandular adenocarcinomas in situ (AIS). The usual treatment of cervical precancerosis is conisation. However, some complications, particularly subsequent adverse pregnancy outcomes, follow all surgical treat-ments of cervix. The treatment could be postponed in women who wish to conceive and who suffer from CIN with a low risk of transformation to invasive cancer. The presence of modifying factors can help to stratify CIN lesions according to their malignant potential. The determination of detected HPV genotypes may help in this decision, because the fate of CIN 2/3 depends on the genotype of associated HPV infection. Cervical lesions associated with HPV 16, 18 or 45 are at a much higher risk of rapid progression to invasive cancers than lesions associated with other HR HPV genotypes. Surgical treatment of CIN 2/3 in women with a desire for future child-bearing can be postponed in cases non-associated with HPV 16, 18 and 45, on a case by case basis. Attempts are made to improve evaluation of the lesions by using biological and molecular markers, especially p16INK4a staining. Younger age, ongoing pregnancy, favourable colposcopic findings, negative p16INK4a staining and immunocompetency are independent factors supporting the choice of conservative management. Adenocarcinoma in situ management substantially differs from the management of CIN.Conclusion: It is important both to assess all modifying factors correctly and to minimize any harm from unnecessary surgical treatment or overtreatment of cervical precancer lesions.Keywords: cervical intraepithelial neoplasia, adenocarcinoma in situ, conisation, tailoring treatment, human papillomavirus genotype, p16.
    Ceska gynekologie / Ceska lekarska spolecnost J. Ev. Purkyne 01/2014; 79(5):372-377.
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    ABSTRACT: There is a considerable number of studies on the efficacy HPV (human papillomavirus) vaccination against different cancers but relevant information is scattered in diverse journals. This paper is a review summarizing current knowledge of the potential of HPV vaccination against all HPV related cancers.
    Klinická onkologie: casopis Ceské a Slovenské onkologické spolecnosti 01/2014; 27(4):239-46.
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    ABSTRACT: More than 90% of cases of anal cancers are caused by high-risk human papillomavirus (HR HPV) infection and a history of cervical intraepithelial neoplasia (CIN) is established as possible risk factor. To demonstrate relationship between anal and cervical HPV infection in women with different grades of CIN and microinvasive cervical cancer. A total of 272 women were enrolled in the study. The study group included 172 women who underwent conization for high-grade CIN or microinvasive cervical cancer. The control group consisted of 100 women with non-neoplastic gynecologic diseases or biopsy-confirmed CIN 1. All participants completed a questionnaire detailing their medical history and sexual risk factors and were subjected to anal and cervical HPV genotyping using Cobas and Lynear array HPV test. Cervical, anal, and concurrent cervical and anal HPV infections were detected in 82.6%, 48.3% and 42.4% of women in the study group, and in 28.0%, 26.0% and 8.0% of women in the control group, respectively. The prevalence of the HR HPV genotypes was higher in the study group and significantly increased with the severity of cervical lesion. Concurrent infections of the cervix and anus occurred 5.3-fold more often in the study group than in the control group. Any contact with the anus was the only significant risk factor for development of concurrent HPV infection. Concurrent anal and cervical HR HPV infection was found in nearly half of women with CIN 2+. The dominant genotype found in both anatomical locations was HPV 16. Any frequency and any type of contact with the anus were shown as the most important risk factor for concurrent HPV infection.
    Journal of clinical virology: the official publication of the Pan American Society for Clinical Virology 11/2013; · 3.12 Impact Factor
  • D Driák, I Svandová
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    ABSTRACT: Besides condoms and vasectomy with their own limitations, no other reliable methods of contraception are available to men. Ion channels play a key role in maturation, capacitation and acrosome reaction of sperms. Blockade of calcium channels with pharmacological inhibitors or compounds isolated from plant extracts might be suggested as one of promising mechanisms of future male contraceptives. Keywords: male contraception - calcium channels - blockade.
    Ceska gynekologie / Ceska lekarska spolecnost J. Ev. Purkyne 01/2013; 78(2):216-220.
  • Daniel Driák, Borek Sehnal
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    ABSTRACT: Human papillomavirus is one of the most frequent sexually transmitted diseases; more than three quarters of sexually active population are infected during their lifetime. Most of papillomavirus infections clear spontaneously, however persistent high-risk human papillomavirus 16 and 18 are responsible for over 70% of all cases of cervical cancer and related to a major part of cancers in the vulva, vagina, penis, anal region, and oropharynx. It is estimated that approximately 5.2% of all cancers are associated with oncogenic human papillomavirus infection. Keywords: human papillomavirus - cervical cancer - vulvar cancer - vaginal cancer - penile cancer - oropharyngeal cancer - esophageal cancer - genital warts - laryngeal papillomatosis.
    Casopís lékar̆ů c̆eských 01/2013; 152(1):15-9.
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    ABSTRACT: Background: Review of revised staging system for vulva, explaining the changes of staging and their impact on the prognosis of disease is presented. Aim: The main objectives of a reliable staging system include an assessment of prognosis, planning treatment, and the evaluation of their outcomes. A good staging system must meet three basic characteristics: validity, reliability and practicality. Since medical research and practice in the field of oncology have shown explosive growth, the staging of vulvar cancer and some other cancers did not give a good spread of prognostic groupings. Changes based on new findings were proposed in 2008 by the FIGO Committee on Gynecologic Oncology, approved, and published a year later the changes in the staging system for carcinoma of the vulva. Stage 0 was deleted, since it represents preinvasive lesion. Stage IA remained unchanged and stage I and II were combined. The number and morphology of the involved nodes were taken into account, and the bilaterality of positive nodes has been discounted. Conclusion: The purpose of a good staging system is to offer a classification of the extent of gynecological cancer, in order to provide a method of conveying ones clinical experience to others for the comparison of different treatment methods. As a result of the explosion of medical research in the field of oncology, the staging of some of the gynecological cancers became outdated and did not give a good spread of prognostic groupings. According to the revised staging for carcimona of the vulva, patients are divided to groups with similar prognosis. Therefore, exchange of relevant information between oncological centers is facilitated, thus disseminating knowledge and stimulating research in other parts of the world. Key words: cancer staging - cancer of the vulva - TNM staging - FIGO staging - gynecological cancer The authors declare they have no potential conflicts of interest concerning drugs, products, or services used in the study. The Editorial Board declares that the manuscript met the ICMJE "uniform requirements" for biomedical papers.Submitted: 15. 4. 2013Accepted: 30. 4. 2013.
    Klinická onkologie: casopis Ceské a Slovenské onkologické spolecnosti 01/2013; 26(5):319-322.
  • D Driák, B Sehnal, I Svandová
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    ABSTRACT: Currently developed selective progesterone receptor modulators (SPRMs) are steroid derived compounds with a bulky radical substitution at carbon 11. They interact with progesterone receptor and exert antagonistic or/and agonistic effects. Mifepristone was approved for pregnancy termination and ulipristal acetate as emergency contraception and pharmacological therapy of uterine fibroids. SPRMs inhibit endometrial proliferation and myoma growth, this suggests a therapeutical effect in cases of endometriosis and other estrogen-dependent diseases. Keywords: progesterone - progesterone receptor -selective progesterone receptor modulators - agonists and antagonists of progesterone - pregnancy termination - emergency contraception.
    Ceska gynekologie / Ceska lekarska spolecnost J. Ev. Purkyne 01/2013; 78(2):175-181.
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    ABSTRACT: To summarize current knowledge of prevalence, duration and clearance of anal HPV infection among women and its relation to cervical HPV infection. Review article. Setting: Department of Gynecology and Obstetrics, Hospital Na Bulovce and 1st Medical School of Charles University, Prague; Institute for the Care of Mother and Child, Prague; Gynecologic Oncology Center, Department of Gynecology and Obstetrics, General Faculty Hospital and 1st Medical School of Charles University, Prague. The infection of human papillomavirus (HPV) is strongly associated with the development of anal cancer. Anal HPV infection is common and most anal HPV infections are transient. Women with cervical HPV infection, cervical dysplasia and cervical cancer are at the increased risk. Concurrent anal and cervical HPV infection is most prevalent among the youngest women. By contrast, the prevalence of anal infection alone remains relatively steady in all age groups. Compared with cervical infections, the overall distribution of HPV genotypes in the anus are more heterogeneous and include a greater proportion of nononcogenic types. A high degree of genotype-specific concordance is observed among concurrent anal and cervical infections, indicating a common source of infection. Tobacco smoking delays clearance of anal HPV. The high degree of genotype-specific concordance suggests that the cervix may be primary source and may serve as reservoir of HPV infection, too. Any type of sexual contact may be a route of transmission, history of anal intercourse is not a condition. The women with HPV related disease of low genital tract form high-risk group for acquisition of anal HPV infection and development of anal carcinoma.
    Ceska gynekologie / Ceska lekarska spolecnost J. Ev. Purkyne 06/2012; 77(3):210-4.
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    ABSTRACT: Review of new staging systems for gynaecological cancers and their impact on prognosis and planning treatment. Review article. Department of Gynaecology and Obstetrics, First Faculty of Medicine and University Hospital Na Bulovce, Charles University, Prague; Department of Radiotherapeutic Oncology, First Faculty of Medicine and University Hospital Na Bulovce, Charles University, Prague; Department of Pathology, University Hospital Na Bulovce, Prague. Every staging system should have 3 basic characteristics: it must be valid, reliable, and practical. Over the years, these staging classifications--with the exception of cervical cancer and gestational trophoblastic neoplasia--have shifted from a clinical to a surgical-pathological basis. Changes based on new findings were proposed in 2008 by the FIGO Committee on Gynecologic Oncology, approved in September 2008 by the FIGO Executive Board, and published in 2009. The greatest changes were made in the new staging system for carcinoma of the vulva and others in the new staging systems for carcinoma of the cervix and carcinoma of the endometrium. A new stanging system was also created for uterina sarcomas, based on the criteria used in other soft tissue sarcomas. A clinical staging system for carcinoma of cervix continues because surgical staging cannot be employed worldwide (especially in third world countries). Stage 0 has been deleted from the staging of all tumours, since it is pre-invasive lesion and it is not an invasive tumour. In the revised staging system for carcinoma of the endometrium, four fundamental changes have occurred, which will be discussed. Carcinosarcoma is still staged identically to carcinoma of the endometrium. A completely new staging system was created for adenosarcomas, along with an almost identical staging system for leiomyosarcoma and endometrial stromal sarcoma. The staging system for carcinoma of ovary and Fallopian tube remains without changes. Since medical research and practice in the field of oncology have shown explosive growth, the staging of some of the gynaecological cancers did not give a good spread of prognostic groupings. Therefore, revised FIGO and TNM staging system has been structured to represent major prognostic factors in predicting patients' outcomes and lending order to the complex dynamic behavior of gynaecological cancers. The purpose of good staging system is to offer a classification of the extent of gynaecological cancer in order to provide a method of conveying one's clinical experience to others for the comparison of treatment methods.
    Ceska gynekologie / Ceska lekarska spolecnost J. Ev. Purkyne 10/2011; 76(5):360-6.
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    ABSTRACT: Review of new staging systems for gynaecological cancers and their impact on prognosis and planning treatment. Review article. Department of Gynaecology and Obstetrics, First Faculty of Medicine and University Hospital Na Bulovce, Charles University, Prague. Department of Radiotherapeutic Oncology, First Faculty of Medicine and University Hospital Na Bulovce, Charles University, Prague. Department of Pathology, University Hospital Na Bulovce, Prague. The main objectives of any good staging system--essential to an evidence-based approach to cancer--include planning treatment, providing an assessement of prognosis and the evaluation of the results of treatment. With this approach, the exchange of relevant information between oncological centers is facilitated, thus disseminating knowledge and stimulating research in other parts of the world. A good staging system must have three basic characteristics: validity, reliability, and practicality. The first staging system for gynaecological cancers appeared around the turn of the 20th century and was applied to carcinoma of the cervix uteri. Classifications for the other gynaecological malignancies were not created until the 1950s. Over the years, these staging classifications--with the exception of cervical cancer and gestational trophoblastic neoplasia--have shifted from a clinical to a surgical-pathological basis. Some changes, brought about through new findings, were approved by the FIGO in 2008 and published in 2009. The greatest changes were made in the new staging system for carcinoma of the vulva, while others were made in the new staging systems for carcinoma of the cervix and carcinoma of the endometrium. A new stanging system was also created for uterine sarcomas, based on the criteria used in other soft tissue sarcomas. As a result of the explosion of medical research in the field of oncology, the staging of some of the gynaecological cancers became outdated and did not give a good spread of prognostic groupings. Therefore, revised FIGO and TNM staging system has been structured to represent major prognostic factors in predicting patients' outcomes and lending order to the complex dynamic behavior of gynaecological cancers. The purpose of a good staging system is to offer a classification of the extent of gynaecological cancer, in order to provide a method of conveying one's clinical experience to others for the comparison of different treatment methods.
    Ceska gynekologie / Ceska lekarska spolecnost J. Ev. Purkyne 09/2011; 76(4):279-84.
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    ABSTRACT: The maintenance of tissue homeostasis and highly balanced counteraction of cellular proliferation and apoptosis are essential for tissue integrity. In our study, we evaluated the expression of apoptosis- regulating proteins Bcl-2, Bax and PARP, and executive apoptotic enzyme caspase-3 in normal, atrophic, hyperplastic and cancerous endometrium. Endometrial samples were obtained from patients who underwent curettage, hysteroresection or hysterectomy. The protein levels were quantified by immunoblotting. We observed a higher level of important apoptotic enzyme pro-caspase-3 and its active form in hyperplastic and cancerous endometrium, when compared to normal endometrium. The value of Bcl-2/Bax ratio, which reflects cellular resistance to apoptosis, was determined as > 1 for cancerous, normal, and atrophic endometrium. Thus, the effort to eliminate pre-neoplastic and neoplastic cells by apoptosis indicated by high pro-caspase-3 and caspase-3 levels seems to be overcome by a greater proliferative adjustment suggested by higher Bcl-2/Bax ratios in the samples examined. The PARP levels did not vary significantly among the groups. The levels of all examined proteins were significantly lower in atrophic endometrium. Our results suggest that pre-neoplastic and neoplastic states of human endometrium are not influenced simply by changes in apoptosis, but may also be affected by cellular proliferation. A high Bcl-2/Bax ratio as observed in cancerous endometrium can point to deregulation of apoptotic programmes. Thus, the onset and progression of endometrial malignancy could be linked to increased cellular proliferation with defects in apoptotic control.
    Folia biologica 01/2011; 57(3):104-11. · 1.22 Impact Factor
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    ABSTRACT: Endometrial cancer is the second most common malignancy of the female genital tract. Its incidence in the Czech Republic is 32/100 000 women and year with a permanent increasing tendency. In comparison with incidence, its mortality remains relatively low, with mortality ratio of 6.7 per 100,000 women and year. The decrease in mortality might be explained predominantly by early diagnostics. The most controversial issue is the potential risk of microscopic extrauterine dissemination of cancerous cells within the peritoneal cavity and circulation during hysteroscopy, and the question if the relatively high pressure of distension medium used during hysteroscopies may or may not multiply the risk. Retrospective study. Totally, 400 endometrial biopsies were collected during years 2007-2009 at our clinic. In 56 patients, endometrial cancer was diagnosed. Afterwards, 44 women underwent surgery, during which peritoneal washing (lavage) and cytological examination were done. Fifty-six patients with histologically verified endometrial carcinoma were studied. The samples examined in the study were classified by grading as follows: G1 n=34, G1-2 n=10, G2 n=10, G3-4 n=2. In 44 cases that underwent radical surgery, no cancerous cells in peritoneal washings were found. Only in 1 case, the cytology obtained from peritoneal washing was considered to be suspicious. In 9 cases, carcinoma on the base of the polyp was detected, and in 2 cases, no residuum of cancer was observed after hysterectomy. In accordance with contemporary literature and based on our study, we suggest that hystero-resectoscopy does not increase the risk of dissemination of malignant cells within the peritoneal cavity and does not worsen the prognosis of the disease. On the contrary, the samples taken under visual control provide more precise and earlier diagnostics of endometrial cancer.
    Ceska gynekologie / Ceska lekarska spolecnost J. Ev. Purkyne 04/2010; 75(2):105-8.
  • International Journal of Gynecology & Obstetrics 10/2009; 107. · 1.84 Impact Factor
  • International Journal of Gynecology & Obstetrics - INT J GYNECOL OBSTET. 01/2009; 107.
  • International Journal of Gynecology & Obstetrics - INT J GYNECOL OBSTET. 01/2009; 107.
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    ABSTRACT: This study compares several parameters of sexual life and course of labor in women with planned and unplanned pregnancy. 339 primiparas participated in our study; they filled in a questionnaire concerning their sexual life during pregnancy on the second or third day after the delivery. One question also stressed planning of pregnancy. 246 women (i.e., 72.6%) indicated planned pregnancy, 93 pregnancies (i.e., 27.4%) were not planned. Significant decrease of coital activity and number of orgasms and increase of sexual dysfunctions were observed in the whole study group during pregnancy. Significant differences between women with planned and unplanned pregnancy were observed only in frequency of vaginal dryness and pelvic pain. According to the results of this study, unplanned pregnancy has no adverse effect on parameters of the labor. The equal rate of partner's presence at delivery shows a high involvement of the partners of unmarried women.
    Journal of Psychosomatic Obstetrics & Gynecology 10/2008; 29(3):157-63. · 1.59 Impact Factor
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    ABSTRACT: Analysis of the set of women that underwent the termination of pregnancy in IInd trimester at the OBGYN clinic, Teaching Hospital Na Bulovce at interval of years 2006-2007. We appreciated the effect of method and compared with references in the literature. TYPE STUDY: Retrospective descriptive study. SEATTING: OBGYN clinic of the 1st faculty of Charles University, teaching hospital Na Bulovce, Prague. Retrospective analysis of the set of women that underwent termination of pregnancy in the IInd trimester. Data are obtained from medical documentation and statistically processed. The analysis treats with 50 cases, in all of them, cervix was prepared with hydrophile dilators. In 37 cases were subsequently handed up prostaglandins intraamnially, in two cases generally intravenously, in two cases vaginally and 9 pregnancies were finished directly by dilatation and curettage without endeavour about expulsion. From 37 women after intraamnial administration of prostaglandins, 35 (94.6%) aborted successfully. Average time from amniocentesis to expulsion was 13 hours 45 minutes, 23 women aborted to 24 hours (62.2%). Undesirable effects were present in 12 cases (32.4%). Our record of local intraamnial administration of prostaglandins appears to be effective method. On the other hand, other methods are described in recent literature, which appear to be more efficient and have smaller occurrence of adverse effects.
    Ceska gynekologie / Ceska lekarska spolecnost J. Ev. Purkyne 05/2008; 73(2):118-22.
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    ABSTRACT: Gastrointestinal form is the second stage of the Acute Radiation Syndrome (ARS) with a threshold dose of 8 Gy. It represents an absolutely lethal clinical-pathological unit, enteritis necro-hemorrhagica (duodenitis, jejunitis, ileitis, respectively) with unknown causal therapy. The purpose of our study has been to evaluate the morphological changes in a model of radiation-induced enteritis in rats and estimate the significance of changes in biodosimetry. Wistar rats were randomly divided into 21 groups, 10 animals per group. Samples of the jejunum were taken 24, 48, 72, and 96 h after the whole-body gamma-irradiation with the doses of 1, 5, 10, 15, and 20 Gy, and routinely stained with hematoxylin and eosin. Five morphometric markers--intercryptal distance, enterocytal height on the top and base of villus, length of basal lamina of 10 enterocytes and enterocytal width--in irradiated rat jejunum were examined. The results were compared with sham-irradiated control group. After lethal doses of irradiation, all morphometric parameters of jejunum significantly changed. With the exception of intercryptal distance, they might be considered as suitable biodosimetric markers under these experimental conditions. Our morphometry results in radiation-induced jejunitis are in accordance with those in other studies. We were the first who quantified morphological post-irradiation changes in animal jejunum. Some of them might be used under experimental conditions. This experimental study is a predecessor of the clinical assessment of a specific marker. Under clinical practice, the sensitive biodosimetric parameter could serve as one of the guidance for evaluation of the absorbed dose in irradiated troops as well as rescue workers. This is in accordance with tasks and Standardization Agreement of the North Atlantic Treaty Organization.
    Physiological research / Academia Scientiarum Bohemoslovaca 02/2008; 57(3):475-9. · 1.53 Impact Factor

Publication Stats

49 Citations
20.68 Total Impact Points

Institutions

  • 2005–2011
    • Charles University in Prague
      • • Gynekologicko-porodnická klinika (2. LF)
      • • 1. lékařská fakulta
      Praha, Hlavni mesto Praha, Czech Republic
  • 2007–2008
    • Bulovka University Hospital
      Praha, Praha, Czech Republic