Revolutionizing cancer treatment: a comprehensive review of CAR-T cell therapy

Chimeric antigen receptor (CAR)-T cell therapy is a promising new treatment for cancer that involves genetically modifying a patient's T-cells to recognize and attack cancer cells. This review provides an overview of the latest discoveries and clinical trials related to CAR-T cell therapy, as well as the concept and applications of the therapy. The review also discusses the limitations and potential side effects of CAR-T cell therapy, including the high cost and the risk of cytokine release syndrome and neurotoxicity. While CAR-T cell therapy has shown promising results in the treatment of hematologic malignancies, ongoing research is needed to improve the efficacy and safety of the therapy and expand its use to solid tumors. With continued research and development, CAR-T cell therapy has the potential to revolutionize cancer treatment and improve outcomes for patients with cancer.

The Phantom Mark: Enigmatic roles of phospho-Threonine 4 modification of the C-terminal domain of RNA polymerase II

The largest subunit of RNA polymerase II (Pol II) has an unusual carboxyl-terminal domain (CTD). This domain is composed of a tandemly repeating heptapeptide, Y₁ S₂ P₃ T₄ S₅ P₆ S₇ , that has multiple roles in regulating Pol II function and processing newly synthesized RNA. Transient phosphorylation of Ser2 and Ser5 of the YS₂ PTS₅ PS repeat have well-defined roles in recruiting different protein complexes and coordinating sequential steps in gene transcription. As such, these phospho-marks encipher a molecular recognition code, colloquially termed the CTD code. In contrast, the contribution of phospho-Threonine 4 (pThr4/pT4) to the CTD code remains opaque and contentious. Fuelling the debate on the relevance of this mark to gene expression are the findings that replacing Thr4 with a valine or alanine has varied impact on cellular function in different species and independent proteomic analyses disagree on the relative abundance of pThr4 marks. Yet, substitution with negatively charged residues is lethal and even benign mutations selectively disrupt synthesis and 3' processing of distinct sets of coding and non-coding transcripts. Suggestive of non-canonical roles, pThr4 marked Pol II regulates distinct gene classes in a species- and signal-responsive manner. Hinting at undiscovered roles of this elusive mark, multiple signal-responsive kinases phosphorylate Thr4 at target genes. Here, we focus on this under-explored residue and postulate that the pThr4 mark is superimposed on the canonical CTD code to selectively regulate expression of targeted genes without perturbing genome-wide transcriptional processes. This article is categorized under: RNA Processing > 3' End Processing RNA Processing > Processing of Small RNAs RNA Processing > Splicing Regulation/Alternative Splicing.

Arabidopsis thaliana possesses two novel ELL associated factor homologs

Transcription elongation is one of the key steps at which RNA polymerase II-directed expression of protein-coding genes is regulated in eukaryotic cells. Different proteins have been shown to control this process, including the ELL/EAF family. ELL Associated Factors (EAFs) were first discovered in a yeast two-hybrid screen as interaction partners of the human ELL (Eleven nineteen Lysine-rich Leukemia) transcription elongation factor. Subsequently, they have been identified in different organisms, including Schizosaccharomyces pombe. However, no homolog(s) of EAF has as yet been characterized from plants. In the present work, we identified EAF orthologous sequences in different plants and have characterized two novel Arabidopsis thaliana EAF homologs, AtEAF-1 (At1g71080) and AtEAF-2 (At5g38050). Sequence analysis showed that both AtEAF-1 and AtEAF-2 exhibit similarity with its S. pombe EAF counterpart. Moreover, both Arabidopsis thaliana and S. pombe EAF orthologs share conserved sequence characteristic features. Computational tools also predicted a high degree of disorder in regions towards the carboxyl terminus of these EAF proteins. We demonstrate that AtEAF-2, but not AtEAF-1 functionally complements growth deficiencies of Schizosaccharomyces pombe eaf mutant. We also show that only AtEAF-1 displays transactivation potential resembling the S. pombe EAF ortholog. Subsequent expression analysis in A. thaliana showed that both homologs were expressed at varying levels during different developmental stages and in different tissues tested in the study. Individual null-mutants of either AtEAF-1 or AtEAF-2 are developmentally normal implying their functional redundancy. Taken together, our results provide first evidence that A. thaliana also possesses functional EAF proteins, suggesting an evolutionary conservation of these proteins across organisms.

Schizosaccharomyces pombe Pol II transcription elongation factor ELL functions as part of a rudimentary super elongation complex

ELL family transcription factors activate the overall rate of RNA polymerase II (Pol II) transcription elongation by binding directly to Pol II and suppressing its tendency to pause. In metazoa, ELL regulates Pol II transcription elongation as part of a large multisubunit complex referred to as the Super Elongation Complex (SEC), which includes P-TEFb and EAF, AF9 or ENL, and an AFF family protein. Although orthologs of ELL and EAF have been identified in lower eukaryotes including Schizosaccharomyces pombe, it has been unclear whether SEC-like complexes function in lower eukaryotes. In this report, we describe isolation from S. pombe of an ELL-containing complex with features of a rudimentary SEC. This complex includes S. pombe Ell1, Eaf1, and a previously uncharacterized protein we designate Ell1 binding protein 1 (Ebp1), which is distantly related to metazoan AFF family members. Like the metazoan SEC, this S. pombe ELL complex appears to function broadly in Pol II transcription. Interestingly, it appears to have a particularly important role in regulating genes involved in cell separation.

The amino-terminal domain of ELL transcription elongation factor is essential for ELL function in Schizosaccharomyces pombe

Transcriptional elongation is a critical step for regulating expression of protein-coding genes. Multiple transcription elongation factors have been identified in vitro, but the physiological roles of many of them are still not clearly understood. The ELL (Eleven nineteen Lysine rich Leukemia) family of transcription elongation factors are conserved from fission yeast to humans. Schizosaccharomyces pombe contains a single ELL homolog (SpELL) that is not essential for its survival. Therefore to gain insights into the in vivo cellular functions of SpELL, we identified phenotypes associated with deletion of ell1 in S. pombe. Our results demonstrate that SpELL is required for normal growth of S. pombe cells. Furthermore, cells lacking ell1⁺ exhibit a decrease in survival when exposed to DNA-damaging conditions, but their growth is not affected under environmental stress conditions. ELL orthologs in different organisms contain three conserved domains, an amino-terminal domain, a middle domain and a carboxyl-terminal domain. We also carried out an in vivo functional mapping of these conserved domains within S. pombe ELL and uncovered a critical role for its amino-terminus in regulating all its cellular functions, including growth under different conditions, transcriptional elongation potential and interaction with S. pombe EAF. Taken together our results suggest that the domain organization of ELL proteins is conserved across species, but the in vivo functions as well as the relationship between the various domains and roles of ELL show species-specific differences.

Structure function characterization of the ELL Associated Factor (EAF) from Schizosaccharomyces pombe

EAF (ELL Associated Factor) proteins interact with the transcription elongation factor, ELL (Eleven nineteen Lysine rich Leukemia) and enhance its ability to stimulate RNA polymerase II-mediated transcriptional elongation in vitro. Schizosaccharomyces pombe contains a single homolog of EAF (SpEAF), which is not essential for survival of S. pombe in contrast to its essential higher eukaryotic homologs. The physiological role of SpEAF is not well understood. In this study, we show that S. pombe EAF is important in regulating growth of S. pombe cells during normal growth conditions. Moreover, SpEAF is also essential for survival under conditions of DNA damage, while its deletion does not affect growth under environmental stress conditions. Our in vivo structure-function studies further demonstrate that while both the amino and carboxyl terminal domains of SpEAF possess the potential to activate transcription, only the amino terminal domain of SpEAF is involved in interaction with the S. pombe ELL protein. The carboxyl-terminus of SpEAF is required for rescue of the growth defect under normal and DNA damaging conditions that is associated with the absence of SpEAF. Using bioinformatics and circular dichroism spectroscopy, we show that the carboxyl-terminus of SpEAF has a disordered conformation. Furthermore, addition of trifluoroethanol triggered its transition from a disordered to α-helical conformation. Taken together, the results presented here identify novel structural and functional features of SpEAF protein, providing insights into how EAF proteins may enforce transcriptional control of gene expression.

Practices and Knowledge regarding Prevention of Tetanus among Doctors in Delhi

A cross-sectional study was conducted in Delhi to study immunisation practices regarding prevention of tetanus among doctors and their knowledge regarding its prevention. Delhi was divided into five zones, and from each zone two hospitals and five dispensaries were selected, giving due representation agency-wise. All the doctors posted for casualty duty in the selected hospitals, all doctors posted in the selected dispensaries and two private practitioners selected randomly from the nearby area of the selected dispensaries were included in the study. Only 7% of doctors had received their last dose of tetanus toxoid to complete the immunisation schedule and majority had received it following injury. As much as 38.3% of doctors favoured TT after every injury. Out of the remaining who opposed it only 59.5% could provide the correct reason for this. Less than half of the doctors knew the indications of anti-tetanus serum. There is a need for the doctors to take TT immunisation more seriously and adopt recommended immunisation practices, because if they themselves are not following the guidelines, it is likely to be reflected in their advice and motivation to patients.

Practice and knowledge regarding prevention of tetanus among nursing personnel in Delhi

A cross-sectional study was conducted in Delhi to assess the practices and knowledge regarding tetanus immunization among nursing personnel. Majority of the study subjects had received their last dose of tetanus toxoid injection only after injury and just 4.4% received it to complete the immunization schedule. More than 12% subjects did not know whether they had received any tetanus toxoid injection or not, another 5.5% had their last dose of tetanus toxoid more than ten years back. As many as 20 (22.2%) subjects stated that TT should be given after every injury. Of the remaining 70 subjects only 22.9% correctly knew why TT was not required. Only one third of the subjects knew the indications of anti tetanus serum.

Knowledge about tetanus immunization among doctors in Delhi

BACKGROUND

In spite of the clear-cut guidelines regarding tetanus immunization, we have observed that tetanus toxoid injection is often given after injury without considering previous immunization status. One of the reasons for this could be that the doctors themselves are not aware of the correct immunization schedules against tetanus.

AIMS

1. To assess the knowledge about tetanus immunization in relation to injuries among doctors. 2. To assess their knowledge about tetanus immunization schedules in children, pregnant women and adults.

SETTING AND DESIGN

It was a cross-sectional study conducted in Delhi.

MATERIALS AND METHODS

After complete enlisting of all the government allopathic hospitals and dispensaries, a representative sample (including private practitioners from the nearby area of selected dispensaries) of doctors was selected. All the doctors were personally contacted and information was collected through a pre-structured self-administered proforma.

STATISTICAL ANALYSIS

Data was analyzed using a computer and wherever applicable Chi-square test/Z test or Fishers' Exact test was applied.

RESULTS AND CONCLUSION

As many as 38.3% of doctors favored tetanus toxoid injection after every injury. The correct knowledge of immunization against tetanus in children, pregnant women and adults was 75%, 90.8% and 35.8% respectively. The knowledge regarding when to give boosters was even poorer. The present study showed that doctors had poor knowledge about tetanus immunization that needs to be improved.

Awareness about pulse polio immunization among the general population in Delhi

A study was conducted in three intensive pulse polio immunization (IPPI) centres in Delhi on 24th September, 2000 to assess the awareness about poliomyelitis and the IPPI programme. A structured questionnaire was used to elicit the information from 182 accompanying persons (41 males and 141 females) by qualified medical doctors. Majority (92.9%) of the respondents knew that the administered drops were polio vaccine. Major sources of information were television (32.9%), relatives or friends (24.2%), health staff (20.9%), poster or leaflets (15.9%). Only 18.1% knew the next IPPI day. Out of 43 claiming to know the number of subsequent IPPI days during 2000, only 22 could tell correctly. A large number of respondents (86.2%) knew that IPPI would help in preventing polio in children. Paralysis of limbs as a clinical feature of polio was known to 70.3%, 45.6% knew that polio cannot be cured and 21.9% perceived that polio could also lead to death. The nationwide intensive awareness campaign for polio eradication was found to be partially effective in disseminating the information.