Hyaluronic acid (HA) is a glycosaminoglycan with a straight-chain polymer arrangement defined as the extracellular matrix constituent. High molecular weight HA has normal physicochemical, biological, and physiological properties whereas low molecular weight has the property of angiogenesis, inflammation, and suppresses apoptosis. This study occupied the samples of 35 paraffin block from poorly and well differentiated retinoblastoma tissue and 8 normal retinal block which have been collected for 4 years from 2010-2013 Afterwards, the paraffin blocks were immunohistochemically examined for HA staining, expression of cell proliferation , and cell apoptosis to determine intratumoral aggressiveness of retinoblastoma. HA on poorly differentiated retinoblastoma stain with a high immunostaining of 76.2%, while well differentiated retinoblastoma on the highest HA staining was revealed to be at moderate level of 64.3%, and not appear in normal retina. In poorly differentiated retinoblastoma, the location of most HA stain is in the cell cytoplasm (87.5%). In the well differentiated retinoblastoma, the HA immunostaning mainly occurred in the cell membrane (73.7%). Histopathological retinoblastoma grading showed a significant correlation (p <0.01) towards several variables of HA immunostaining, Ki-67, and cell apoptosis. In addition, the histopathological retinoblastoma grading also revealed a significant correlation (p <0.01) towards the location of HA staining (cell membrane and cytoplasm). Both stainings are also play role in retinoblastoma differentiation. The malignancy of retinoblastoma can be proven by the increased HA staining at cytoplasm in poorly differentiated and associated with increased of cell proliferation along with decreased apoptosis.
ABSTRAKAsam hialuronat (HA) merupakan senyawa glikosaminoglikan dengan polimer rantai lurus yang berfungsi mengisi matriks ekstraseluler. HA dengan berat molekul besar memiliki sifat fisikokimia, biologis, dan fisiologis normal sedangkan berat molekul rendah berperan dalam proses angiogenesis, inflamasi, dan supresi apoptosis. Penelitian ini menggunakan 35 sampel blok parafin jaringan poorly dan well differentiated retinoblastoma serta 8 blok retina normal yang dikoleksi selama 4 tahun dari tahun 2010-2013 di RSUD Dr. Soetomo, Surabaya, Indonesia. Setelah itu, blok parafin diuji imunohistokimia dengan pewarnaan HA, ekspresi proliferasi sel (Ki-67), dan apoptosis sel untuk melihat agresivitas retinoblastoma intratumoral. Pewarnaan HA pada poorly differentiated retinoblastoma menunjukkan pewarnaan yang tinggi sebesar 76.2%, sedangkan pada well differentiated retinoblastoma menunjukkan pewarnaan yang tinggi pada tingkat sedang sebesar 64.3%, dan tidak muncul pada retina normal. Pada poorly differentiated retinoblastoma, rata-rata pewarnaan HA muncul di sel sitoplasma (87.5%). Pada well differentiated retinoblastoma, pewarnaan HA rata-rata muncul di area membran sel (73.7%). Grading histopatologis retinoblastoma menunjukkan korelasi signifikan terhadap beberapa variabel yaitu pew...