Related Experiment Video
Updated: Jan 28, 2026
05:53
In vivo Electroporation of Developing Mouse Retina
Published on: June 24, 2011
21.5K
The Neuroprotective Peptide PACAP1-38 Contributes to Horizontal Cell Development in Postnatal Rat Retina
Viktoria Denes1, Orsolya Hideg1, Zsolt Nyisztor1
1Department of Experimental Zoology and Neurobiology, University of Pécs, Pécs, Hungary.
Investigative Ophthalmology & Visual Science
|February 23, 2019
Summary
Pituitary adenylate cyclase-activating polypeptide (PACAP1-38) promotes retinal cell differentiation by selectively inducing horizontal cell proliferation during the first postnatal week in rats. This signaling pathway may influence retinal patterning and retinoblastoma development.
Area of Science:
- Neuroscience
- Developmental Biology
- Ophthalmology
Background:
- The pituitary adenylate cyclase-activating polypeptide (PACAP1-38) is known for its neuroprotective effects in the developing retina.
- Its specific role in retinal cell differentiation remains largely uncharacterized.
Purpose of the Study:
- To identify PAC1-expressing cells in the developing rat retina.
- To investigate the functional effects of PACAP1-38 on retinal cell differentiation.
- To determine the developmental regulation of PACAP1-38-mediated events during the first postnatal week.
Main Methods:
- Immunohistochemistry was used to identify PAC1 and calbindin-positive cells in postnatal day 1 (P1) rat retinas.
- Intravitreal injections of PACAP1-38 were administered to P1, P3, and P7 rat pups.
- Real-time PCR and immunoblots were employed to assess cell proliferation markers (PCNA) at various time points post-injection.
Main Results:
- PAC1 expression was observed in the retinal pigment epithelium (RPE), neuroblastic layer (NBL), and ganglion cell layer (GCL), including horizontal cells.
- PACAP1-38 treatment significantly increased horizontal cell number at P3 and P7 by upregulating cell proliferation, but was ineffective at P1.
- Proliferative cells induced by PACAP1-38 were localized in the NBL and identified as horizontal cells.
Conclusions:
- PACAP1-38 selectively induces horizontal cell proliferation in a time- and cell-specific manner via PAC1 during retinal differentiation.
- PACAP1-38 signaling may play a crucial role in retinal patterning.
- PACAP signaling could be critical in the context of retinoblastoma development.
Related Concept Videos
02:43Peptide Bonds
82.8K
A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
82.8K
01:32The Retina
76.6K
The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
76.6K
01:23Binet's Contribution to Measures of Intelligence
1.7K
Alfred Binet, along with his student Théophile Simon, was tasked by the French Ministry of Education in 1904 to create a method for identifying students who struggled to learn through conventional classroom instruction. This initiative aimed to address overcrowding by placing such students in specialized schools. Binet and Simon developed an intelligence test comprising 30 tasks, ranging from simple commands, like touching one's nose or ear, to more complex tasks, such as drawing...
1.7K
01:19Introduction to Horizontal Curves
670
Horizontal curves are essential in highway and railroad design, ensuring smooth and safe transitions between straight path segments, or tangents. These curves allow vehicles to maintain speed without abrupt changes, minimizing accidents and improving travel efficiency.A horizontal curve is typically defined by its geometric relationship to two tangents that meet at an intersection point (P.I.), where a simple curve is introduced to connect them. The back tangent refers to the initial tangent...
670
01:03Horizontal Curve: Problem Solving
373
A horizontal curve is characterized by its radius, intersection angle, and stationing of key points. In this case, the radius is 400 meters, and the angle of intersection is 30 degrees, with the station of the point of curvature (P.C.) at 0 + 150 meters. The goal is to determine the station values at the point of intersection (P.I.), point of tangency (P.T.), and midpoint of the curve, as well as the length of the long chord.The process begins with calculating the tangent distance (T) and the...
373
01:27Horizontal Gene Transfer
1.8K
Horizontal gene transfer (HGT) is a process where genetic material moves between organisms within the same generation, unlike vertical gene transfer, which occurs from parent to offspring. HGT plays a crucial role in microbial evolution, adaptation, and survival, particularly in shared environments like the human gut.Mobile genetic elements such as plasmids, prophages, integrons, insertion sequences, and transposons facilitate this process. HGT occurs through three primary mechanisms:...
1.8K