HEMATOPOETIK KÖK HÜCRE İZOLASYONUNDA ALDH ETKİNLİĞİNİN ÖNEMİ

Yıl 2017, Cilt: 80 Sayı: 2, 63 - 70, 30.06.2017

Leyla Türker Şener Aycan Baş İbrahim Kalelioğlu Suzan Aydın Çınar İşıl Albeniz

https://doi.org/10.18017/iuitfd.330504

Öz

Amaç: Kan
hücrelerine kolaylıkla farklılaşabilen hematopoetik kök
hücrelerin (HKH) saflaştırmasında tercih edilen yöntem, flow sitometrik veya
magnetik ayırım sistemi ile CD34⁺ hücrelerin seçimidir. İnsan kök hücrelerini
tamamen fenotipik hücre yüzey belirteçlerine dayanmadan etkin olarak saptayan
metodlara ihtiyaç vardır. Bu metodlardan biri retinoid metabolizması ve
HKH’lerin siklofosfamid gibi alkilleyici ajanlara direncinde rol oynayan
sitozolik aldehid dehidrogenaz (ALDH)’dır. Farklı fonksiyonları olan kordon kanından
klinik uygulamalarda kullanılabilen en primitif insan hematopoetik kök ve progenitör hücrelerin daha yüksek saflıkta
eldesinin CD34⁺CD38^- yüzey belirteçlerinin yanı sıra ALDH ile de işaretlenerek akım sitometri
analizi sonrası ALDH⁺ hücrelerin diğer hücrelerden ayrılarak olabileceğinin
belirlenmesi amaçlanmıştır. Hematopoetik hücre serilerine farklılaştırılma
çalışmaları için sadece CD34⁺ hücrelerin seçilmesinin yeterli
olmadığı ALDH⁺ ve CD38^- negatifliğin de analiz edilmesi
amaçlanmıştır.

Gereç ve yöntemler: Biz çalışmamızda CD34 yüzey belirteci olan hücreleri kordon kanından
magnetik nanopartiküller kullanarak ayırdıktan sonra flow sitometre cihazıyla,
bu hücrelerin içerisinden ALDH etkinliği olup CD38 yüzey antijeni olmayan hücreleri saflaştırdık.
Bu hücre gruplarını floresan mikroskobu ile görüntüledik.

Bulgular: Yaptığımız bu
çalışmada kordon kanından saflaştırdığımız CD34⁺ hücrelerin
ALDH-FITC işaretlenmeleri sonucunda aldığımız floresan mikroskop ve flow
sitometrik (facs) analizinde CD34⁺ olan hücrelerin ALDH⁺
olduğu görüldü.

Sonuç: Bu çalışmamızın sonucunda kordon kanından
hematopoetik kök hücre izolasyonunda ALDH⁺ hücre grubu CD34⁺CD38^-
hücrelerden zengin olduğu ve hücre kültüründe koloni oluşturma özelliğine sahip
olduğu görülmüştür. Kordon kanından hematopoetik kök hücre izolasyonunda
yalnızca CD34⁺ olmasının yeterli olmadığı ALDH⁺ ve CD38^-
negatifliğin de analiz edilmesi gerektiği düşünülmektedir.

Anahtar
kelimeler: Hematopoetik kök hücre; kordon
kanı; ALDH; CD34.

Anahtar Kelimeler

Hematopoetik kök hücre, kordon kanı, ALDH, CD34

IMPORTANCE OF ALDH ACTIVITY IN HEMATOPOIETIC STEM CELL ISOLATION

Öz

Objective: The
preferred method for the purification of hematopoietic stem cells (HSCs), which
can easily differentiate into blood cells, is the selection of CD34⁺
cells by flow cytometry or magnetic discrimination. Methods are needed that
effectively determine human stem cells without entirely relying on phenotypic
cell surface markers. One of these methods is cytosolic aldehyde dehydrogenase
(ALDH), which plays a role in retinoid metabolism and resistance of HSCs to
alkylating agents such as cyclophosphamide. The prospective isolation of human
hematopoietic stem and progenitor cells with different functions, as well as
surface markers, are also recommended by ALDH and flow cytometry. In the above
findings, ALDH⁺ cells can be isolated from other cells and the most
primitive hematopoietic stem cells can be isolated and used in clinical
applications.

Materials and methods: In our
study, we separated the CD34 surface marker cells from cord blood using
magnetic nanoparticles and then purified the cells with ALDH activity and non-CD38
surface antigen by flow cytometer. We visualized these cell groups with
fluorescence microscopy.

Results: We observed
that the majority of CD34⁺ cells were ALDH⁺ in fluorescence
microscopy and flow cytometry (FACS) analysis of CD34⁺ cells
purified from cord blood as a result of ALDH-FITC markings.

Conclusion: As a result of this study, it
was found that the ALDH⁺ cells group is rich in CD34⁺
CD38^- cells in hematopoietic stem cells isolated from cord blood, and is capable of colony formation in
cell culture. It is suggested that in hematopoietic stem cell isolation
from cord blood, only CD34⁺ cells are not sufficient and ALDH⁺
and CD38^- negativity should also be analyzed.

Keywords:
Hematopoietic stem cells; cord blood; ALDH; CD34.

Anahtar Kelimeler

Hematopoietic stem cells, cord blood, ALDH, CD34

Kaynakça

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