1.Stemness gene expression profile of human adipose derived stem cells in long-term culture.
Zaman WS ; Makpol S ; Santhapan S ; Chua KH
The Medical Journal of Malaysia 2008;63 Suppl A():61-62
It is crucial to know whether stem cells retain its stemnness properties after advance in vitro manipulation. The objective of this study was to investigate the stemness gene expression of human adipose tissue derived stem cells (ADSCs) in long-term culture using quantitative RT-PCR technique. Our data showed that the expression level of Sox-2, Rex-1, FGF-4, Nanog, Nestin, BST-1, FZD-9 and Oct-4 were decreased gradually in long-term culture. This could mean that the ability of ADSCs to differentiate into other cell lineages reduce after extensive culture.
2.The role of Rho GTPases in the regulation of the rearrangement of actin cytoskeleton and cell movement.
Rokeya BEGUM ; M S A NUR-E-KAMAL ; M A ZAMAN
Experimental & Molecular Medicine 2004;36(4):358-366
The rearrangement of the actin cytoskeleton has been shown to play a critical role in the development of transformation and malignant phenotype of cancer cells. Rho family GTPases regulate the arrangement of the actin cytoskeleton. By wound-healing assay, we have found that NIH 3T3 fibroblast cells move towards the wound- gaps by extending filopodial and lamellipdial structures at the leading edge of the moving cells. We have inactivated the function of Rho GTPases of v-Ras transformed NIH 3T3 cells by overexpressing Rho GTPase-activating (RhoGAP) domain of RhoGAP of p190. We have observed that inactivation of Rho, Rac and Cdc42 GTPases by overexpressing RHG causes inhibition of: (i) polymerization of actin to form filaments, (ii) formation of lamellipodia, filopodia and stress fibres, (iii) cell motility, (iv) cell spreading and (v) cell-to-cell adhesions. These results further strengthen the current knowledge on the role of Rho, Rac and Cdc42 GTPases in the regulation of the rearrangement of actin cytoskeleton. Our results, for the first time, demonstrate that RhoGAP domain of RhoGAP could be used to study the molecular mechanism of Ras-mediated signalling in growth, differentiation and carcinogenesis.
Animals
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Biological Assay
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Cell Line, Transformed
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Cell Movement/*physiology
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Cell Transformation, Neoplastic/*ultrastructure
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Mice
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Microfilaments/metabolism/*ultrastructure
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NIH 3T3 Cells
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Research Support, Non-U.S. Gov't
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Wound Healing
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rho GTP-Binding Proteins/genetics/*physiology
3.A Case Report Of Cobb Syndrome
Nik Kamarul Zaman NKA ; Yeoh ZY ; Lim AKT ; Duski S ; Chye PC
Malaysian Orthopaedic Journal 2018;12(Supplement A):184-
4.Interplay of interleukins (IL6, IL10) and 25 hydroxycholecalciferol in asthmatic subjects with chronic post-COVID condition (PCC)
Jaleel, A. ; Namoos, K. ; Asim, S. ; Uppal, S.S. ; Zaman, S. ; Irfan, H. ; Pervaiz, S. ; Tariq, M. ; Shafique, M.
Tropical Biomedicine 2024;41(No.1):70-77
The study aimed to compare and correlate serum levels of IL-6, 10, and 25-hydroxycholecalciferol
in individuals with asthma with and without post-COVID condition (PCC). The study was designed
to investigate the inflammatory response and serum 25-hydroxycholecalciferol status in asthmatics
with and without PCC. A cross-sectional study of 252 subjects (128 asthmatics and 124 non-asthmatic
subjects) was carried out. Interleukins and 25-hydroxycholecalciferol levels were estimated on ELISA.
The principle findings were that IL-6 and 25-hydroxycholecalciferol levels were significantly increased
(p<0.001), while IL-10 levels were non-significant in asthmatics with PCC compared to those without PCC.
However, 25-hydroxycholecalciferol levels were significantly increased, but no significant change was
observed in IL-6, and IL-10 levels in non-asthmatics with and without chronic PCC. A significant positive
correlation (r = 0.258) was found between 25-hydroxycholecalciferol and IL-6 but a significant negative
correlation (r = -0.227) with IL-10 in asthmatics with PCC. Similarly, a significant negative correlation (r
= -0.285) was found between 25-hydroxycholecalciferol and IL-10 but was non-significant with IL-6 in
asthmatics without PCC. The correlation of 25-hydroxycholecalciferol with IL-10 was significant (0.683),
but IL-6 was non-significant in non-asthmatics with PCC. Multiple regression analysis showed that age,
IL-6, gender, and PCC were significantly related in adjusted values to 25-hydroxycholecalciferol. This
study sheds light on the complex liaison between 25-hydroxycholecalciferol levels and inflammatory
responses in asthmatics, especially those with PCC. The findings suggest that although asthmatics with
PCC maintain sufficient levels of 25-hydroxycholecalciferol, they show a substantial increase in the proinflammatory response. This suggests that PCC exacerbates the pro-inflammatory response in asthma.
Moreover, the study reveals that asthmatics, whether with or without PCC, display a negative correlation
between 25-hydroxycholecalciferol and the anti-inflammatory response. This emphasizes the main
influence of asthma on the overall inflammatory response. These findings reveal a complex interplay
between vitamin D levels and inflammatory mediators in asthmatic individuals with and without PCC.
5.Efficacy of pentamidine-loaded chitosan nanoparticles as a novel drug delivery system for Leishmania tropica
Khan, R.U. ; Khan, M. ; Sohail, A. ; Ullah, R. ; Iqbal, A. ; Ahmad, B. ; Khan, I.U. ; Tariq, A. ; Ahmad, M. ; Said, A. ; Ullah, S. ; Ali, A. ; Rahman, M.U. ; Zaman, A. ; Bilal, H.
Tropical Biomedicine 2022;39(No.4):511-517
The present study compares the in vitro effects of nanoparticles loaded pentamidine drug and
conventional pentamidine on Leishmania tropica. Herein, pentamidine-loaded chitosan nanoparticles
(PTN-CNPs) have been synthesized through an ionic gelation method with sodium tripolyphosphate
(TPP). Next, the physical characteristics of PTN-CNPs were determined through the surface texture,
zeta potential, in vitro drug release, drug loading content (DLC), and encapsulation efficacy (EE) and
compared its efficacy with free pentamidine (PTN) drug against promastigotes and axenic amastigotes
forms of L. tropica in vitro. The PTN-CNPs displayed a spherical shape having a size of 88 nm, an
almost negative surface charge (-3.09 mV), EE for PTN entrapment of 86%, and in vitro drug release
of 92% after 36 h. In vitro antileishmanial activity of PTN-CNPs and free PTN was performed against
Leishmania tropica KWH23 promastigote and axenic amastigote using 3-(4, 5- dimethylthiazol-2-yl)-2,
5-diphenyletetrazolium bromide (MTT) assay. It was observed that the effect of PTN-CNPs and free
PTN on both forms of the parasite was dose and time dependent. Free PTN presented low efficacy even
at higher dose (40 µg/ml) with 25.6 ± 1.3 and 26.5 ±1.4 mean viability rate of the promastigotes and
axenic amastigotes, respectively after 72 hrs incubation. While PTN-CNPs showed strong antileishmanial
effects on both forms of parasite with 16 ± 0.4 and 19 ± 0.7 mean viability rate at the same higher
concentration (40 µg/ml) after 72 hrs incubation. Half maximal inhibitory concentration (IC50) values
of PTN-CNPs toward promastigotes and amastigotes were obtained as 0.1375 µg/ml and 0.1910
µg/ml, respectively. In conclusion, PTN-CNPs effectively inhibited both forms of the L. tropica; however,
its effect was more salient on promastigotes. This data indicates that the PTN-CNPs act as a target drug
delivery system. However, further research is needed to support its efficacy in animal and human CL.