Pavliša, Gordana
(2006)
Razina eritropoetina, angiogenetskih faktora i upalnih citokina u sermu prije i nakon korekcije teške hipoksemije u bolesnika s kroničnom opstruktivnom bolesti pluća [ Serum level of erythropoietin, angiogenic factors and cytokine before and after the severe hypoxaemia correction in chronic obstructive pulmonary disease patients ].
PhD thesis, Sveučilište u Zagrebu.
Abstract
Activation of erythropoesis and angiogenesis by hypoxia represent important homeostatic mechanisms which balance between methabolic requirements of the organism and the oxygen delivery to organs through blood vessels. The regulation of these physiologic mechanisms in hypoxia-related COPD is not clear. Fifty-seven consecutive patients with COPD in acute exacerbation of chronic respiratory failure entered the study. EPO, VEGF, bFGF, IL-1β, IL-6, TNF-α were serially taken. Initial EPO value was above the reference range in only 15,5%. The mean of this variable was 41,42±83,54 U/L. VEGF and b-FGF were elevated. The mean VEGF and b-FGF were 1042,00±1097 and 6,04±2,45 pg/ml consecutively. Among the investigated cytokines IL-6 values were elevated with a mean of 45,67±86,5 pg/ml. EPO correlated significantly negative to PaO2 (p=0,0043). VEGF correlated significantly positive to L (p=0,0415), SE (p=0,037) and negative to PaO2 (p=0,0111) and Sat (p=0,0153). After the hypoxemia correction, EPO was significantly reduced already on the 2nd day of treatment to a value of 14,1±16,9 U/L (p=0,0093). EPO did not show a unique pattern in all the patients. In 63,2% of patients, a fall in EPO levels was observed, but in 36,8% EPO rose within the first 24 hours of follow-up. VEGF, bFGF, IL-1β, IL6 and TNF-α were not significantly changed 24 hours after the correction of hypoxemia. In conclusion, low values of EPO in the majority of patients indicate that inadequate erythropoietic reaction to hypoxia in COPD patients is predominantly hampered at the level of EPO production, instead at subsequent stages of erythropoesis. The rise of EPO in a significant number of patients, after hypoxemia correction stands in favour of reversible initial inhibition. Elevated values of VEGF and bFGF indicate that the process of angiogenesis is activated in this group of patients as an important way of tissue and organism adaptation to hypoxia. The relations we found indicate that hypoxia is a strong inductor of VEGF production in this system, but that acute and chronic inflammation also has a probable role in the expression of this factor.
Abstract in Croatian
Aktivacija eritropoeze i angiogeneze hipoksijom predstavljaju važne homeostatske mehanizme koji balansiraju metaboličke potrebe organizma i dopremu kisika organima putem krvnih žila. Regulacija ovih fizioloških mehanizama u KOPB-u vezanom uz hipoksiju nije jasna. U istraživanje je konsekutivno uključeno 57 tipičnih bolesnika s KOPB-om i teškom hipoksemijom. EPO, VEGF-a, bFGF-a, IL-1β, IL-6, TNF-α određivani su u predhodno određenim vremenskim intervalima. Inicijalno je EPO bio povišen samo u 15,5% ispitanika. Srednja vrijednost ove varijable iznosila je 41,42±83,54 U/L. VEGF i b-FGF bili su povišeni. Srednja vrijednost za VEGF iznosila je 1042,00±1097 pg/ml, a za b-FGF 6,04±2,45 pg/ml. Od ispitivanih je citokina IL-6 bio povišenih vrijednosti i njegova srednja vrijednost je bila 45,67±86,5 pg/ml. EPO značajno negativno korelira s PaO2 (p=0,0043). VEGF značajno pozitivno korelira s L (p=0,0415), SE (p=0,037) i negativno s PaO2 (p=0,0111) i Sat (p=0,0153). Nakon korekcije hipoksemije, EPO značajno pada već drugog dana liječenja i njegova srednja vrijednost iznosi 14,1±16,9 U/L (p=0,0093). Prepoznate su dvije grupe pacijenat s različitim odgovorom na korekciju hipoksemije: grupa A koju je činilo 63,2% pacijenata i u koje je zamijećen očekivani pad EPO i grupa B koju je činilo 36,8% pacijenata u koje je zamijećen neočekivani porast EPO nakon korekcije hipoksemije. VEGF, bFGF, IL-1β, IL-6 i TNF-α ne mijenjaju se značajno 24 sata po korekciji hipoksemije.
U zaključku, nizak nalaz EPO u većine ispitanika upućuje da je neadekvatan eritropoetski odgovor na hipoksiju u KOPB bolesnika predominantno inhibirana na razini produkcije EPO, a ne na kasnijim stupnjevima eritropoeze. Neočekivano je zabilježen porast EPO, nakon korekcije hipoksemije, u značanom broju bolesnika što govori u prilog reverzibilne inicijalne inhibicije. Nije nađena povezanost ove inhibicije s analiziranim faktorima rasta i citokinima. Povišene vrijednosti VEGF-a i bFGF-a ukazuju da je u ove skupine bolesnika aktiviran proces neoangiogeneze kao važan način adaptacije tkiva i organizma na hipoksiju. Nađene povezanosti upućuju da je i u ovom sustavu hipoksija snažan induktor VEGF produkcije, ali da u ekspresiji ovog faktora vjerojatnu ulogu ima akutna i kronična upala.
Item Type: |
Thesis
(PhD)
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Mentors: |
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Departments: |
Izvan medicinskog fakulteta |
Depositing User: |
dr.med. Helena Markulin
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University: |
Sveučilište u Zagrebu |
Institution: |
Medicinski fakultet |
Number of Pages: |
177 |
Status: |
Unpublished |
Creators: |
Creators | Email |
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Pavliša, Gordana | UNSPECIFIED |
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Date: |
22 September 2006 |
Date Deposited: |
12 Feb 2007 |
Last Modified: |
03 Dec 2012 17:13 |
Subjects: |
/ |
Related URLs: |
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URI: |
http://medlib.mef.hr/id/eprint/217 |
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